Canon lbp860

LBP-860
SERVICE
MANUAL
Canon
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PREFACE
This Service Manual contains basic information required for after-sales service of the LBP-860
laser beam printer lhereinafter referred to as the “printer”). This information is vital to the
service trchnirian in maintaining the high print quality and performance of the printer.
The rasselle paper feeder and envelope feeder are prepared for the printer as an optional
equipment, which rontenis are also described in this manual.
This manual consists of the following chapters:
Chapter 1: General Desrriplion

Features. specifications. and operation
Chapter 2: Operation ancl Timing

A description of the operating principles and timing sequences of the electrical and
mechanical systems.
Chapter 3: The Mechanical System

Explanation of mechanical operation, disassembly, reassembly, and adjustment
procedures
Chapter 4: lnstallatlon
Kequirements for a suitable location, installation procedures, plus the storage and
handling of EP-E cartridges
Chapter 5: Mainlmanre and Servicing

Parts replacement schedule, tools, lubricants. and solvents
Chapter 6: Troubleshooting
Heferenrr values and adjustments: troubleshooting procedures
Appendix: General timing chart, general circuil diagram, PCB circuit diagrams, etc.
Information in this manual is subject to change as the product is improved or redesigned.

All relevant information in such cases will be supplied in Service Information Bulletins.
A thorough understanding of this printer. based on information in this Manual and Service
Information Bulletins, is required for maintaining its performance and for locating and
repairing the cause of malfunctions.

CONTENTS
CHAPTER 1 GENERAL DESCRIPTION
I. FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . l - l IV. PARTS OF THE PRINTER . . . . . . . . l-8
II. SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . 1-2 V. OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
III. A SAFETY INFORMATION..... 1-7
CHAPTER 2 OPERATION AND TIMING

I. BASIC OPERATION ................. 2- 1 D. Fixing and Delivery Unit.. .. 2-30
A. Functions.. ........................ 2-l E. Paper Jam Detection.. ....... 2-33
B. Outline of the Electrical V. OVERALL CONTROL SYSTEM. 2-35
System .............................. 2-2 . Outline.. ............................ 2-35
C. DC Controller Input B. Operation.. ........................ 2-36
Signals .............................. 2-3 C. Video Controller PCB.. ....... 2-37
D. DC Controller Input/ D. Control Panel.. .................. 2-40
Output Signals .................. 2-4 E. Self-test.. ........................... 2-41
E. Basic Sequence of F. Status/Error Message.. ...... 2-42
Operations.. ....................... 2-6 VI. POWER SUPPLIES .................. 2-55
II. LASER/SCANNER SYSTEM.. ... 2-7 . Outline.. ............................ 2-56
A. Outline .............................. 2-7 B. Protective System ............. 2-55
B. Scanning Exposure ............ 2-S VII. ENVELOPE FEEDER ............... 2-56
C. Laser Control Circuit.. ....... 2-10 A. Outline of the Electrical
D. Scanner Drive.. .................. 2-13 System.. ............................ 2-56
III. IMAGE FORMATION SYSTEM . 2-15 B. Pick-up/Feed System ........ 2-57
. Outline.. ............................ 2-15 C. Paper Jam Detection.. ....... 2-59
B. Printing Process.. .............. 2-17 VIII. PAPER FEEDER.. .................... 2-60
C. High-Voltage Power Supply 2-23 A. Outline of the Electrical
lV. PICK-UP/FEED SYSTEM.. ....... 2-27 System .............................. 2-60
A. Outline.. ............................ 2-27 B. Pick-up/Feed System ........ 2-61
B. Paper Size Detection ......... 2-28 C. Paper Jam Detection.. ....... 2-61
C. Cassette Feed.. .................. 2-29
CHAPTER 3 THE MECHANICAL SYSTEM

I. EXTERNAL8 ........................... 3-1 III. PAPER TRANSPORT SYSTEM .. 3-7
A. Covers and Panels ............. 3-1 A. Paper Pick-up Unit.. ........... 3-7
B. Exhaust Fan.. .................... 3-4 B. Cassette Pick-up Roller.. .... 3-Q
C. Control Panel Unit.. ........... 3-5 C. MP Tray Pick-up Roller.. .... 3-Q
II. DRIVE SYSTEM ...................... 3-6 D. Separation Pad .................. 3-10
A. Drive Unit.. ........................ 3-6 E. Paper Delivery Unit ........... 3-10
B. Main Motor.. ...................... 3-6 IV. EXPOSURE SYSTEM.. ............. 3-l 1

A. Laser/Scanner Unit . . . . . . . . . . . 3-11 B. Video Controller PCB.. ....... 3-19
V. ELECTROSTATIC IMAGING/ C. DC Controller PCB ............. 3-20
DEVELOPING/CLEANING D. Pick-up Motor Driver PCB.. 3-21
SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12 E. Sensor PCB.. ...................... 3-21
A. EP-E Cartridge . . . . . . . . . . . . . . . . . . . 3-12 F. Power Supply.. ................... 3-22
B. Transfer Charging Roller.... 3-13 G. High-voltage Power
VI. FIXING SYSTEM . . . . . . . . . . . . . . . . . . . . . 3-14 Supply PCB.. ...................... 3-23
A. Fixing Unit ..,.. ................... 3-14 VIII. ENVELOPE FEEDER ............... 3-24
VII. ELECTRONIC COMPONENTS . . 3-18 IX. PAPER FEEDER.. .................... 3-28
A. Video Controller Unit . . . . . . . . 3-18
CHAPTER 4 INSTALLATION
I. CHOOSING A LOCATION.. ....... 4- 1 A. Storage of Sealed
II. UNPACKING AND Cartridges ......................... 4-6
INSTALLATION ....................... 4-2 B. Storage of Unsealed
111. STORAGE AND HANDLING OF Cartridges ......................... 4-6
CARTRIDGES ......................... 4-6 C. Handling Suggestions ........ 4-7
CHAPTER 5 MAINTENANCE AND SERVICING

I. PARTS REPLACEMENT A. Standard Tools .................. 5-2
SCHEDULE.. ........................... 5-1 B. Special Tools.. ................... 6-3
II. EXPECTED SERVICE LIVES V. LIST OF LUBRICANTS.
OF CONSUMABLES.. ............... 5-1 CLEANERS ............................. 5-4
III. PERIODIC SERVICE VI. SERVICE CHECKPOINTS ........ 5-5
SCHEDULE.. ........................... 5-l VII. MAINTENANCE BY
IV. LISTS OF TOOL6.. .................. 5-2 CUSTOMER.. .......................... 5-7
CHAPTER 6 TROUBLESHOOTING
I. INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . 6-l C. Electrical Adjustment . . . . . . . . 6-9
A. Initial Check . . . . . . . . . . . . . . . . . . . . . 6-l IV. IMAGE DEFECTS . . . . . . ,...........a. 6-14
B. Basic Procedure . . . . . . . . . . . . . . . . . 6-2 A. Examples of Image Defects 6-14
C. How to Use the B. Troubleshooting Image
Troubleshooting Tables...... 6-3 Defects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-15
II. EXPLANATION FOR SPECIAL V. TROUBLESHOOTING
TOOL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-4 MALFUNCTIONS ..,. . . . . . . . . . . . . 1.1.. 6-28
A. Printer Driver Tester . . . . . . . . . 6-4 VI. PAPER TRANSPORT
III. MEASUREMENT AND TROUBLESHOOTING 1.. . . . . . . . . . . . 6-42
ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . 6-7 A. Print Paper Jams . . . . . . . . . . . . . . . 6-42
A. Image Adjustment . . . . . . . . . . . . . 6-7 B. Incomplete Paper Feed . . . . . . 6-45
B. Mechanical Adjustment . . . . . 6-7

VII. LOCATION OF ELECTRICAL VIILVARIABLE RESISTORS, LEDS,
PARTS/FUNCTION.. . . . . . . . . . . . . . . . . 6-46 TEST PINS, JUMPERS, AND
A. Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-46 SWITCHES ON PC BOARDS..... 6-56
B. Sensors and Solenoids . . . . . . . 6-48 A. DC Controller PCB . . . . . . . . . . . . . 6-56
C. Motor and Others . . . . . . . . . . . . . . 6-50 B. High-voltage Power
D. PC Boards . . . . . . . . . . . . . . . . . . . . . . . . . . 6-52 Supply PCB . . . . . . . . . . . . . . . . . . . . . . . . 6-57
E. Connectors . . . . . . . . . . . . . . . . . . . . . . . . 6-54 C. Pick-up Motor Driver PCB.. 6-58
D. Paper Feeder Driver PCB.... 6-58
APPENDIX
I. GENERAL TIMING CHART . . . . . . A-l VI. SENSOR CIRCUIT . . . . . . . . . . . . . . . . . . . A-l 1
II. LIST OF SIGNAL6 . . . . . . . . . . . . . . . . . . . A-3 VII. PAPER FEEDER DRIVER . . . . . . . . A-12
HI. GENERAL CIRCUIT . . . . . . . . . . . . . . . . . A-5 VIII. ENVELOPE FEEDER DFUVER . . A-13
Iv. DC CONTROLLER . . . . . . . . . . . . . . . . . . . A-7 IX. VIDEO CONTROLLER . . . . . . . . . . . . . A-14
V. PICK-UP MOTOR DRIVER . . . . . . . A-9 X. EXPANSION ROM CURCUIT . . . . A-19

CHAPTER 1
GENERAL DESCRIPTION
I. FEATURE3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . l - l IV. PARTS OF THE PRINTER.. ...... 1-S

II. SF’ECIFICATIONS . . . . a... . . . . . . . . . . . . l-2 V. OPERATION.. .......................... 1-12
III. ASAFETY INFORMATION..... 1-7

CHAPTER 1
1. Non-impact page printer

This non-impart (low-noise) printer USPS clectrophotographic, electronic, and laser technology
2. High print quality through use of fine toner and high resolution I600 dpil
Toner having a particle size half that of conventional Canon loner and higher resolution (600
dpi) produce clearer images.
3. Easy maintenance
The photosensitive drum. toner. primary charging roller, and drum cleaning unit are combined
into one replaceable assembly called the “EP-E Cartridge”. By the use of the customer-
replaceable cartridge, high printing quality is maintained by replacing the cartridge and simple
cleaning in I hr printer.
4. Roller charging/transfer system

Instead of the conventional corona system, a charging roller/transfer system is used for the
charging and transfer processw. The charging roller system considerably reduces the ozone
product-d by the charging system and the roller transfer system makes paper feeding more
slable.
5. Space-saving front loading for paper feed

Front loading is used to make it easier to load paper. This, along with the built-in, mulli-
purpose tray, reduces the size of the printer and the space it takes up.
6. Four paper feed methods with various options

Four-way paper f’eed~ng is made possible by installing the optional cassette paper feeder
(simply wiled the paper feeder below) and envelope feeder, in addition to the multi-purpose
tray and cassette. By combining the standard cassette with the paper feeder, up to about 750
sheets of paper van be loaded in both the upper and lower cassettes for continuous printing.
7. Automatic interface change function

Thr prinlcr has a parallel interface (Cenlronirs) and a serial interface (RS-232C). It recognizes
the Lype (parallel or serial) of data from the computer, and automatically l changes the
interface. (Automatic interface function)
I-1

CHAPTER 1
A. Construction
I~ Desktop pa@ printer

l‘vw
‘I-intinil. method Elcctropholoqaphy
I
,awr scanning syste”,
<ascr Srmicondurtor laser
icar,ninc system Rotaling six-faced prism mirror (Scanning mirror)
jczmning piclr
l<~i?Z”~t~l 600 dots/inch
JwUral 600 rastc-r lines/inch
‘hotosrns~llvr mrdium OPC
L’hargint( Roller rharging
Exposurr Laser scanning
roner Singlr-componrnt dry toner
l~rvclop”w”l ‘lbner projection dcvclopmrnt
I‘1mrr supply Included in replaceabk EP-E cartridge [The r&ridge ran be used to prin
about 6,000 purges of A4/Letler-sxe paper. The average print coverage is
! II 4% m~agc dot ralio with the print density setting in the middle.)
I’apf,r fwd Multi-purpose tray feed
Cassrtk feed [Two cassetles ran be used when the paper feeder IS
insla1led.l
I‘I-~U~Sfil- Roller transfer
Srp~~r-;ltK,” Curvature: (small drum radius/paper stiffness)
Clrxring Blade
Fixing ; Heat roller (500 w [ 115 VI UT 500 w (240 VI)
Print delivery Fare-down
l-2
CHAPTER 1
B. Performance
-
About 8 pages/min (A4 or Letter)
I
24 s or less (The amount of time from when the printer rer~wes a /PRNT
signal from the video controller when it is ready al an amhienl
temprralure of 20°C until the deliver of an A4/Letler-size paper.)
60 s or less (115- or 2.40-v power source)
75 s or less (loo- or 220-v power source)
(The ~~l~ount of time aflrr the printer is turned ON until the completion o
the w;un-t~p tinw at an ambient temperalure of 20°C with a rated voltag
input.)
Plain paper, colurcd paprr. lahels. OHP film, rnvelopes
l’lain pap”’ from 182 mm X 257 mm to 2 I6 mm X 356 mm (Canon-
approvrd paprr, 60 g/m’ to 128 g/m”), and above type of paper
I’laitr paper of A4. B5, Legal. Letler, or Executive (Canon-approved paper
60 g/ml to 90 g/m’)
Up lo 10 mm stack height (about 100 shrels of80 g/m’ paper)
A4. Letter. liniwrsal (Lc@l, Letter. A4, Execuliw, B5)

IJp to 25 mm stark height (aboul 250 sheets of 80 g/m’ paper)
Up lo 25 mm stack height (about 250 sheets of 80 g/m2 paper)
Enwlopr ferdrr and paper leeder
C. Others
IO to 32.5’C (50 to 90.5-F]

20 to RO”/u RH
570 to 760 mmHg
Max. about 660 W (at ambient temperature of 20°C and rated
power source Volta@)
Noise levrl (DECLARED SOUND POWER LEVEL (lB=lO dB) 6.2 B or less (printin@
NOISE EMISSIONS in 4.5 B or less (standby)
awordanrr with IS0 SOUND PRESSURE LEVEL 49 dB or less (printi&
9296) (Bystander positions) 33 dB or less (standby)
L)imrnsions 424 mm X 4 16 mm X 295 mm (width X depth X heIghtI
Wright 17.0 kg (printer). 1.5 kg (cartridge). 1. I kg (A4 or Letter cassrttel
100-l I5 V (50/60 Hz], 220-240 V (50 Hz)
(Voltage tolerance ilO%)
1-3

D. Video controller
Standard: Enhanced PCL (PCL 5e)

Emulahon: Optional PoslScript’M
1
2MB (Expandable to 66 Megabytes in total with optional RAM SIMM)
2MU (Expandable lo 8 Megabytes in total with optional ROM SIMM)

See table 1-I and 1-2.
See figure l-l.
2 SlOlS
KS-232C. asynchronous. 300, 600. 1200. 2400, 4800.9600. 19200. or

38400 baud
Data Icngth: 7 or 8 bits
Parity: 11 desired
Slop bits: I or 2
Handshaking: XON-XOFF. ETX-ACK, or DTR
s-bit parallel (Ccntronirs standard) interface
1E. Envelope feeder (Envelope Feeder EF-4)
[‘irk up spwd Aboul 6 env&prs/min

Envrlolx typ’ COM- 10. DL. Monarch. C5, B5 (recommended envelope)
~~~~v~~lol~~ size Envelopes from 90mm X 189mm to 178mm X 254mm
i:;lpx ilv Up to 55 mm stark height (about 75 envelopes)
I’0wer supply ~DC24V (SuppIled by the printer)
Dimensions 306.5 X 293 X 127.9 mm (width X depth X height)
Wright About 2.6 kri
F. Paper feeder (Paper Feeder Unit PF-4s / PF-4L)
EP-E Cassette 500 Universal S [letter, A4. Executive)

EI’-E Cassette 500 Universal L (Legal, Letter, A4, Executive)
Casseile specifications Up to 50 mm slack height (about 500 sheets of 80 g/m’ paper)
Power supply DC24V (Supplied by the printer)
Dimensions 416 X 470 X 132 mm (width X depth X height) (including legal cover)
Wciehl About 3.9 ke loauer feedert. about 2 kc (universal cassette1
Specifications are subject to change with product improvement. 1
l-4
CHAPTER 1
Table l-l
*Scalable Fonts
Font Symbol Pitch Point Stroke
Typefact- Spacing Style 1rIr‘ntation I
ID set ICPil Size Weight
,. ‘L
1000 C0llIier Iioman- Fixed Medium Lipright Portrait
Scalable Bold Upright Portrait
IO03 Courier Iioman- Proportional
1004 Courier Iioman- Medium Italic Portrait
Courier Iioman- Bold Italic Portrait
CG Times I <ornan- Medium Upright Porlrait
1007 CG Times 1ioman- Proportional Bold Upright Portrait
IO08 CG Time 1ioman- Proportional Mrdium Italic Portrait
CG Times I7oman-8 Proportional Bold Italic Portrait
1010 Letter Gothic Iioman- Fixed Medium Upright Portrait
IO11 Letter GOthic IiOmaw8 Fixed Bold Upright Portrait
1012 Letter Golhir I ioman- Fixed Medium Italic Portrait
1013 CG Omega IROIIIX-8 Proportional Medium Upright Portrait
1014 CG Omega IRoman-8 Proportional Bold Upright Portrait
1015 CG Omega IRoman-8 Proportional Medium Italic Portrait
1016 CG omega Roman-8 Proportional Bold Italic Portrait
1017 COi-OlX9 Roman-8 Proportional Medium Italic Portrait
1018 ClX?lldOll ROKK3n-E Proportional Bold Upright Portraii
1019 Univrrs Roman-t Proportional Medium Upright Portrait
Univrrs Roman-E Proportional Bold Upright Portrait
102 I Univers Roman-$ Proportional Medium italic Portrait
Univrrs Roman-E PrOpOrtiOIlal Bold italic Portrait
1023 Univers Roman-E Proportional Medium Cond Portrait
IO24 Univrrs Koman-t Proportional Bold Cond Portrait
1025 Univcrs Roman-t Proportional Medium Cond It Portrait
Univers Roman-E Proportional Bold Cond It Pot-trait
AnliqueOlv ROITIX-E Proporliondl Medium Upright POrtrait
1028 AntiqueOh ROman-t Proportional Bold Upright Portrait
AntiqueOh Roman-F Proportional Medium Italic Portrait
Garmond Roman-t Proportional Medium Upright Portrait
103 1 Garmond ROITXX-t ProportIonal Bold Upright Portrait
Garmond Roman-F Proportional Medium Italic Portrait
1033 Garmond Roman-E ProportIonal Bold Italic Portrait
1034 Marlgold ROIIXXVE Proportional Medium Upright Portrait
1035 Aibertus Roman-E Proportional 3mlI BoIc I Upright Portrait
1036 Aibertus Roman-E ProportIonal Ex Bold Upright Portrait
1037 ArIai Roman-E ProportIonal Medium Upright Portrait
1038 A&l Roman-E Proportional Bold UprIght Portrait
1039 Aria1 ROIK%Vt Proportional Medium Italic Portrait
1040 Ariai ROIIlan-E Proportionai Bold Italic Portrait
104 1 Symbol ROlllan-E ProportIonal Medium Upright Portrait
1042 Times New Roman-E Proportlonai Medium Upright Portrait
1043 Times Bd ROman-E Proportional Bold UprIght Portrait
1044 Times New It ROllXUl-E PrOpOltIO~.3i Medium Italic Portrait
1045 Times New Bdi t ROman-E ProportIonal Bold Italic Portrait
1046 Wingdings Roman-E Proportional Medium Upright Portrait
- I
1-5
CHAPTER 1
Table l-2
*Fixed Fonts
Symbol Pitch Point Stroke T

Sparing Style Orientation
1
I
set (CPJJ sixe Weight
1002 Roman-8 FIxed 16.67 8.5 Medium Upright Landscape
1047 IS0 LJ Fixed 16.67 8.5 Medium Upright Portrait
PC-8 Fixed 16.67: 8.5 Medium Upright Portrait
: J’C-R DN Fixed 16.67 8.5 Medium Upright Portrait
I050 i PC-850 Fixed 16.67 8.5 Medium Upright Portrait
1051 L E G A L Fixed 16.67 8.5 Medium Upright Portrait

1052 IS0 LJ ~ Fixed 16.67 8.5 Medium
I
Upright Landscape
P C - 8 Fixr d 16.67’ 8.5 Medium Upright Landscape
PC-R IIN I Fixed 16.67 8.5 Medium I Upright Landscape
PC-850 Fixed 16.67, 8.5 Medium U p r i g h t Landscapc
I
1056 Linr I’rintcr I,EGAL ~Fixed ( 16.671 8.5 Medium
IUpright , Landscape
Right
t
Feed-out dIrection
I
5mm
f B o t t o m ~ff( sctlve printing area

(Image quality is guaranteed in this area.)
Figure l-l
1-6

A. Handling the Laser/Scanner Unit
The laser/scanner unit emits invisible
lasrr beam. Never disassemble the unit;
lhc reflected bram. although invisible. ran
possibly damage your eyes. The unit
rannot be adjusted in the field. The
following label is altached to the cover of
lhe unit:
Figure 1-2
1-7

CHAPTER 1
A. External View
1. Printer
I: Upper cover
2: Face-down tray
3: Right rover
4: Control panel
5: Font card slot
6: Power switch
7: Cassette
8: Multi-purpose tray
9: Test print switch
10: Delivery cover
11: Power receptacle
12: Parallel interface connector
Figure l-3 13: Serial interface connector
14: Cleaning brush
15: Paperaccessdoor
Figure 1-4
Figure 1-5
1-8

2. Paper feeder
1: Paper feeder
2: Cassette (500 sheets can be placed)
Figure 1-6
3. Envelope feeder
1: Envelope side guide

2: Exlension tray
3: Weight
Figure l-7
1-9

CHAPTER 1
B. Cross Sectional View

1. Printer
Figure 1-s
1: Delivery rollers 9: Oblique rollers

2: Lasw/scanner unit 10: Cassette pick-up roller
3: EP-E cartridge 11: Developing cylinder
4: Control panel 12: Transfer charging roller
5: Multi-purpose tray 13: Photosensitive drum
6: Cassette 14: Primary charging roller
7: Mulli-purpose tray pick-up roller 15: Upper fixing roller
8: Separation pad 16: Lower fixing roller
l-10

CHAPTER 1
3. Envelope feeder
Figure 1-9
l-11

CHAPTER 1
A. The Operator Panel

You use the operalor panel to perform basic printer operations, make printer configuration
changes your software application cannot control, identify available typefaces, and check the
status of the printer.
READY ALARM DATA a

on 1
4zl
ON LINE FORM FEED RESET
I-
MENU COPQINUE TEST/fONTS ENTER
Figure l-10
The operator panel consists of the message/menu display window, eight indicator lights, and
sewn menu and operation keys.
1. Message/Menu Display Window

The message/menu display window can display as many as 16 characters. It displays menu
items you can select, and messages that describe lhe status of lhe printer and error conditions.
This chapter describes the menu items you can display in the window. See Chapter 6
‘Troubleshooting, for information about the types of messages that may appear in the window.
1-12

CHAPTER 1
2. Indicator Lights
The indicator lights provide status information about the printer. The lights have different
meanings depending on whether they are on, off, or flashing.
-_
Figure l-11
Indicator
light Mode Description
READY The printer is ready to print.

Off An error or attendance message appears in the display.
Flashing The printer is receiving data.
ALARM On An error has occurred and printing is disabled. An error or
attendance message appears in the display.
Off No error has occurred.
DATA On Print data is currently stored in the printer’ s buffer.
Off No buffered data is in the printer.
ON LINE On The printer is ready to accept and print data from the computer
[on-line status).
Off The printer cannot accept print data from the computer (off-line
status). When the printer is off-line.
1-13

CHAPTER 1
The paper input source indicators are:
~~~~ ENVELOPE FEEDER
STANDARD CASSETTE
LOWER CASSETTE
(PAPER FEEDER UNIT)
-~~ MUCKPURPOSE T R A Y
Figure 1-12
indicator light Mode Description
Envelope On The optional Envelope Feeder is the input source.

Feeder Flashing The optional Envelope Feeder is selected, but does not
contain envelopes.
Multi-purpose On The multi-purpose tray is the input source.
tray Flashing The multi-purpose tray is selected, but does not contain
paper.
Standard On The paper cassette tray is the input source.
cassette Flashing The paper cassette tray is selected, but does not contain
paper.
Lower On The optional Paper Feeder Unit is the input source.
cassette Flashing The optional Paper Feeder Unit is selected, but does not
contain paper.
1-14

CIIAPTER 1
3. Operation Keys
You USC the operation keys to control the basic functions of the printer.
.ON LINE key

You use the ON LINE key to switch the printer between on-line and off-line. The printer must
be on-line to receive information from your computer. To use any of the other keys on the
operator panel, the printer must be off-line.
The message PCL READY appears in the display window when the printer is on-line and ready
to receive data.
READY ALARM
III
ON LINE FORM FEED RESET
I
MENU CO
VN U E TEsT/pNrs ENTER
Figure 1-13
.FORM FEED key

You use the FORM FEED key to print the data stored in the printer’ s buffer. For example. if the
last page stored in the printer’ s memory is a full page but your software does not send a
command to print it, you can press ON LINE to set the printer off-line and then press FORM
FEED to print the last page.
Keep in mind that complex pages may take several minutes to process. Make sure the READY
indicator light has stopped flashing before you press FORM FEED lo print the last page.
The printer must be off-line before yoou press FORM FEED.
Pressing the FORM FEED key does not force a blank sheet through the printer.
*RESET key
You use the RESET key to clear the printer’ s buffer and remove all temporary typefaces and
macros from the printer’ s memory.
After you change a menu item, you may see the RESET TO SAVE message. If so, press RESKT
to make your menu selections the permanent default settings. The message RESET appears in
the display window. ***Can we be more specific here? When does lhe RESET TO SAVE message
appear? ***
l-15
CHAPTER 1
.TEST/FONT key
You use the TEST/FONT key to print the Self Test or the Font List.
When lhe printer is off-line, press the TEST/FONT key once to start the Self Test. Press and
hold the TEST/FONT key to print the Font List. The Self Test and Font List are described later
in this chapter.
*CONTINUE key
You use the CONTINUE key to allow the printer to resume printing after it was placed off-line
by an operational condition. Most operational conditions are identified by a message, such as
PRINT OVERRUN. Before you continue printing, you need to press CONTINUE to clear the
message and se1 the printer back on-line.
The CONTINUE key sets the printer on-line just like the ON LINE key, but you can also use it
in the following ways:
You can press CONTINUE to override the paper or envelope size selecttons regardless of the
media loaded in the multi-purpose tray, lhe optional Envelope Feeder, or a paper cassette.
This means you could use it to print a letter-size page on legal-size paper if legal-size paper
is loaded in the multi-purpose tray
You ran press CONTINUE to override a request to manually feeder paper or an envelope.
When you do this. the printer selects paper from the next available source.
Menu Keys
You use the menu ke.vs to access the various menus and select the available menu items. This
section briefly describes each key. See the Operator Panel Menus section for information about
accessing and selecting menu items.
4XENU key
The MENlJ key cycles through the PCI, PRINT MENU and the PCL CONFIG MENU.
The printer must be off-line when you press the MENU key.
You use the and keys to step through all available choices for a particular menu item. For
example. after you access the ME’T SIZE option from the PCL PRINT MENU, you press to
display the LEXTER, LEGAL, EXEC, A4, COMIO, MONARC. DL, B5. and C5 choices.
You can use the key to display the choices in reverse order. Lf you hold down either arrow key,
the system scrolls rapidly through all choices for the menu option.
.ENTER key
You use the ENTER key to save a selection in the printer’ s permanent memory. An asterisk [*I
appears next to the selection in the menu display window indicating it is the current default
selection. This default selection remains in effect even when you turn off or reset the printer.
If you press ENTER when buffered or temporary data is present, the system only marks the
selections with an asterisk. When you press ON LINE or MENU, the system displays the RESET
TO SAVE message. At this point, you have three choices:
n Press RESET to clear the page buffers, remove temporary data, and return all items to their
permanent default setlings.
n Press ON LINE to place the printer on-line without performing a reset. The selections you
1-16

CHAPTER 1
mad? in the menu are marked with an asterisk but do not become active until the printer
detects a job boundary or you reset the prinler.
W Press CONTINUE to set the printer off-line withoul performing a reset.
*** Need to verify all of this ***
1-17

CHAFTER 1
B. Operator Panel Menus

You (‘LIT, access the following menus though the operator panel:
n PCL PRINT MENU
n PCL CONFlG MENU
LIepending on the options installed in your prinler, other menus may display.
1. Accessing and Selecting Menu Items

Follow these steps to access the menus and make selections:
1. Press ON LINE to se1 the printer off-line.

2. Press MENU once to display the PCL PRINT MENU. Press and hold MENU (for
approximately five seconds) to display the PCL CONFIG MENU.
3. Press MENU until you display the item you want to change.
4. When the item you want Co change appears in the display window, press or to step through
the available choices.
5. When the selection appears in the display window, press ENTER to save it as the default
setting. An asterisk appears next to your selection in the display window.
6. Press ON LINE to se1 the printer on-line.
2. Confirming Your Menu Selections

There are two ways you ran review the selections you made through the operator panel:
n You ran scroll through the menu ilems lo check all selections marked with an asterisk.
n You can print a Self Test. The printed output lists all settings that are in effect. *** Is this
Irue? *** See the Printing the SelfTest section for more information.
1-18

CHAPTER1
3. Restoring the Default Settings

There are several types of default settings:
n Factory default settings are those set for each menu item at the factory. The printer uses
these settings until you change them.
n Temporary drfaull settings are those set by your application software for the current print
job.
n Permanent default setlings are those you set through the operator panel. These selections
remain in effect even when you turn off the printer or send a different request through your
application.
You can restore the factory default settings by performing a cold reset. To perform a cold reset,
press and hold the ON LINE key while you turn on the printer.
The printer displays the message COLD RESET followed by WARMING UP. When lhe printer
comes on-line, the factory default settings are restored.
l-19

CHAPTER 1
C. PCL PRINT MENU Options

The PCL PKINT MENU contains the most commonly used options. You can override or change
all options in this menu through your software application. The changes you make through the
operator panel become the permanent default settings.
I’RlNT
MENU FX%Ory
option default Description
COPIES I Selects the number of copies [from 1 to 99) you want to print.
FNT SRC IN?‘ Selects the font source. You can select:
INT: Internal fonts
CART: Cartridges
SOFl?: Permanent soft font
You see the CART option only if a cartridge is installed, and you see
the SO@T option only if permanent salt fonts are downloaded.
If you do not know the font source and font number, you can print a
Font List. The letter you specify here must match the alpha portion
of the Font # on the Font List. For more information about printing
this list. see the Printing the Font List section.
FNT 0 Identifies the Font Number (0 through 999) as listed on the Font
NUMBEK List. Make sure you use the Font # not the Font ID.
If you have installed a font cartridge with a default mark, the
default-marked font overrides the factory default font. The cartridge
default font appears in the PCL PRINT MENU until you selecl a
different deCault through the operator panel or your software
application, you remove the cartridge. or insert a different cartridge
when the default number is 0. The symbol set for the PCL PRINT
MENU is not changed by the marked cartridge.
PITCH 10.00 Selects pitch sizes from 0.44 to 99.99 characters per inch (cpi) in
scroll increments of 0.01. [Hold down the arrow key to increment
rapidly.) You can select a pitch if the font indicated by FNT SRC and
FNT NUMBER is a scalable typeface with fixed spacing. The LBP-
860 adjusts the height (point size) of the characters according to the
pitch you select.
I-1‘. SIZE 12.00 Selects the point size from 4.00 to 999.75 points in 0.25.point
increments. The scroll increment is 0.25 or 1.00 (if you hold down
the arrow key). You can select the point size if the font indicated by
FNT SRC and FNT NUMBER is a scalable font with proportional
spacing.
Point size is a measure of the vertical height of a character in l/72
of an inch. The LBP-860 adjusts the character’s horizontal spacing
according to the point size you select.
l-20

CZ-LAPTER 1
PRINT
MENU Factory
TRAY ALL Selects how the printer will load paper. You can select:
ALL Loads paper from any l&&r input source. The printer
loads from the standard cassette first: if Lhis cassette is
empty, it loads from the lower cassette (if the Paper Feeder
Unit is installed) or lhe multi-purpose tray.
STD Loads from the standard paper cassette only: if this
cassette is empty, you see an error message.
MPT Loads from the multi-purpose tray only; if this tray is
empty, you see an error message.
1,OWER Loads from the optional Paper Feeder Unit only; if this
cassette is empty, you see an error message. You see this
selection only if the optional Paper Feeder Unit is installed.
ENV Loads from the optional Envelope Feeder unit only; if this
feeder is empty, you see an error message. You see this
sclcrtion only if the optional Envelope Feeder unil is
installed.
Selects the paper size loaded in the multi~purpose tray. You can
selerl :
LEKITEK: 8.5 x 11 inrhrs
LEGAL 8.5 x 14 inches
EXEC: 7.5 x 10.5 inches
A4: 2 10 x 297 mm
COMlO: 4.125 x 9.5 inches
MONARC:3.875 x 9.5 inches
r)k llOx220mm
H5: 182 x 257 mm
C5: 162 x 219 mm
Selects the image size al which the printer formats the page unless
a software command overrides it. You ran select:
LMTER: 8.5 x 11 inches
LEGAL: 8.5 x 14 inches
EXEC: 7.5 x 10.5 inches
A4: 21Ox297mm
ENVELOPE COM 10 Selects the image sue at which the printer formats the envelope
unless a software command overrides it. You see this menu item
only if the optional Envelope Feeder is installed. You can select:
MONARCz3.875 x 9.5 inches
DL: llOx220mm
B5: l82x257mm
c5: 162 x 219 mm
ORIENTATI E’ Selects the direction of print on the page.

ON P: Portrait prints along the width of the page
L: Landscape prints along lhe length of the page
You can print in reverse portrait or reverse landscape orientations
by making selections through your software application or using
printer commands. The LBP-860 has a font rotation feature which
makes all fonts available in all orientations.
1 - 21

CHAPTER 1
I’RIN’I
MENU Fart “l-y
FORM 60 Selects the number of lines to print on each page (5 through 128) as
LINES well as the amount of space between lines. The FORM menu item
places the first line of lext at the top margin, the last line of text at
the bottom margin. and spaces the remaining lines equally between
them. Make sure the text length setting in your software application
matches the value you use for this item. If it is set lo a greater value
in your application, lhe first line of texl may begin successively
lower on each page.
MANIJAI, OFF Turns the manual feed function ON or OFF. Manual feed is available
FIXD only through the mulli-purpose tray. When MANUAL FEED=ON. the
printer goes off-line when a print job is sent and displays MPT TRAY
followed by LOAD LELTER. Press the RESET key to manually feed
the media in the multi-purpose tray. *** Pressing the RESET key is
da~lgerous: if the user presses the key loo long, it erases the data in
the buffer! *** To override a manual feed request, press the
CONTINUE key.
SYM SF1 Selects the symbol set [see the following lisl).
The IBl’-860 provides 40 symbol sets you can choose. A symbol set
is a unique grouping of all the available characters in a fonl. This
listing shows the internal symbol sets you can select from the
operator panel.
Scalable ‘lypefkcc and

t%iLnlapprd Fonts Scalable Typefaces Only
Roman-8 VN MATH WINDOWS

ECMA-94 Latin 1 VN INTL DESKTOP
X-8 VN US VN DING
PC-K D/N I’S MATH I’S DING
PC850 I’S TFXT
I DING 1
Legal MATH-8 DING 2 Dingbats
Rornarl-8 VN MATH WINDOWS
ISO-nn I MS PUBL
German
Spanish
1 nn=2. 4. 6 (US ASCII). 10. 1 I. 14, 15, 16. 17, 21, 25, 57, 60, 61, 69, 84, or 85. The PCL
Font List printout shows all symbol sets for installed cartridges and permanent
downloaded soli fonts. Internal bitmapped font symbol sets are only shown in Roman-8,
ECMA-94, Latin I, PC-B, PC-8 D/N, PC-850, and Legal. The remaining selectable internal
symbol srts appear on the PCL Font List printout only if selected as the default symbol set
from the operator panel.
I-22

CHAPTER 1
D. PCL CONFIG MENU Options

The PCL CONFIG MENU controls certain conflguration settings for your LBP-860. You cannot
override or change options in this menu through your software applicalion.
The I/O oplion allows you to set up the communication parameters for the serial interface (if
you arc using it).
CONFIG
MENU Farto1y
option del%ult Desrriplion
AUTO ON Determines how the printer reacts Lo data and printer errors. You
CON-1 can select:
ON: Any non-critical error message appears on the display for
aboul 10 seconds: then the PCL READY message appears
and printing resumes.
OFF: Any atlrndancc or error message remains in the display
until you correct lhe problem, tell the printer to continue.
or both.
I/O AUTO Selecls thr- prinlcr interface. You can select:

AUTO: Allows the printer to determine the interface port. which
can lx either parallel or serial. The printer displays the
communications options described in the next section.
PAKALLEL:Selects the parallel interface only. The printer skips to
the KES menu option.
SEKIAL:Selects the serial inlerfare only. The printer displays the
communications options described in the next section.
RES tiO0 x 600 Sclwls 300 or 600 dpi. When you change resolution, it lakes
eff&l for ihe next print job or when you reset the printer through
the operator panel. You can select:
300 x 300: for graphics and fonts designed for 300 dpi.
600 x 600: for graphics and fonts designed for 600 dpi; use
when document contains a mix of 300 and 600 dpi
bitmaps.
l-23

CHAPTER 1
CONFIG
MENU FXtory
option deSa& Description
PG I’ROT OFF Reserves additional memory for the page imaging process. This
allows the printer to create the complete page image in memory
before paper starts through the printer, which ensures the entire
page is printed. The value you set for page protection does not
lake effect until you reset the printer or it encounters a job
boundary. *** Is this true? ***
The complexity of a page may exceed the printer’s ability to
create the image and keep pace with the printing process. If a
page is too complex. the page may print in parts. or only part of
the page may print. II data loss occurs, the PRINT OVERRUN
nwssage appears in the display. If you often receive this message,
you may wed to install additional memory and set a value for
page protection.
The memory required for page protection is dependent on the

A page at 600 dots per inch (dpi) requires
four times more memory than a page at 300 dpi. If you use page
protcrtion. set it for the paper size you expect to use most often.
Makr sure you have sufficient memory installed for the option
you select. The figures shown here include 2MB of internal
memory. You can select:
OFF: requires minimum inslalled memory of 2MH for 300 and

600 dpi.
LTR: requires 2MB for 300 dpi: 6MB for 600 dpi.
124: requires 2MB for 300 dpi: 6MB for 600 dpi.
LGL: requires 3MB for 300 dpi: 6MB for 600 dpi.
t’rint density is a measure of the darkness of print on the page.

You ran experiment with different settings to find the best setting
lor your print job. To make print darker, use a higher selting: to
make print tighter, use a lower setting. The selections are from 0
Io 15.
NOTE: When you set lhe density to a higher level.
LANG ENGLISH The LBP-860 supports the English language.
dhnmunications Menu
Thhc I/O option allows you lo set up the communication parameters for the serial interface (if
you arc {Ising it).
II you set I/O to AUTO or SERIAL. you see the liillowing menu options:
9600 Determines the rate at which information is transferred between

the computer and printer. You can selecl300, 600. 1200, 2400.
4800, 9600. 19200. 38400, or 57600.
t IANDSMK ROBUST Selects the handshake method for controlling data transfer
between the computer and printer. For RS-232C operation, you
can select ROBUST, XON, or N/W.
l-24

CILAPTER 1
DTR HI Allows you to choose active high (HI) or active low (LOW) for the
POLARITY DTR signal Itne.
DATA BITS 8 Determines the data bits used in transmission. Some

minicomputer environments only support 7 bit printer data.
Setting DATA BITS=7 allows the printer function correctly in
environments where the eighth bit is not supported. PCL graphics
and soft fonts may not function correctly when DATA BITS=7. You
can select 8 or 7.
PARITY NONE Determines whether parity checking is enabled. Setting PARITY to

EVEN or ODD allows parity checking for some types of data
transmission errors. When parity checking is enabled, the printer
will display the message, 40 ERROR???, when it detects a parity
error. The host computer and the printer must use the same
parity setting. You can select NONE, EVEN, or ODD.
STOP BITS 1 Determines the number of stop bits to use during

communication. The host computer and the printer must use the
same setting. You can select 1 or 2.
1 - 25
E. Printing the Self Test
Follow these steps to print the Self Test:
1. Press the ON LINE key to set the printer off-line.
2. Press the TEST/FONT key once. The printer displays the SELF TEST message followed by
the PRINTING TEST message.
3. When the Self Test is complete, press ON LINE to set the printer on-line.
NOTE: You can continuously print the Self Test. To do so, press and hold the TEST/FONT key
for more than six seconds. The printer displays the CONT. SELF TEST message. You
must turn elf the printer to stop the continuous SelfTest.
Use the Self Test to verify operator panel selections. system configurations (memory and
options], and print quality.
The elements of the self tesl are as follows:
*** Need final Self Test***
1. Standard Menu Selections: Shows standard menu selections, such as Printing Menu and
PCL Menu. and menu options, such as copies and MP tray, in the order they appear in the
control panel display.
2. RAM Size: Shows the total amount of installed printer memory, including added optional
memory. The LBP-860 comes with 2MB of installed memory. If you install optional memory,
you can use a self test to verify it is properly installed.
3. Page Count: Shows how many pages have been prtnted. You can use the page count to
track printer use. The page count is always updated.
4. Datecode: Eight-digit date indicating when the formatter firmware was last revised. This
information may be of use to a service technician.
5. Other Installed Options: Lists any installed typeface cartridges, paper trays, personalities,
and other options.
6. Print Pattern: Provides a text print pattern so you can check print density and quality.
l-26

CHAPTER 1
F. Printing the PCL Font List
Follow these steps to print Ihe Font Lisl:
I. Press the ON LINE key to set the printer off-line.

2. Press and hold the TEST/FONT key (for approximately five seconds). The printer displays
the FONT I’IIINTOUT message.
3. When the Font List is complete. press ON LINE to set the printer on-line.
The PCL Font Lisl shows ihe typeface and bitmapped fonts currently available in your printer
(both internal and oplional) for PCL print jobs.
I‘he elements of the PCL Font List are as follows:
Figure 1-16
l-27
CIIAPTER 1
l-28
CHAPTER 1
l-29

CHAPTER 1
*** Nred Jkal Font List ***
1. Typeface is the name of the typeface.

2. Pitch/Point indicates the specified pitch or point size of the font. The escape sequence
contains a shaded box followed by v or h. This indicates where you must enter the point
size (for example. 14.25 v) or the pitch (for example, 12.00 h).
3. Escape Sequence (a PCL command) is used to select the designated font. Fill in Pitch or
Point and Symbol Set in the boxes as required.
4. Font # is the number you use to select internal, cartridge, or downloaded soft fonts from
the control panel. The letter preceding the font number shows the source of the font. (I is
Internal. C is Cartridges. and S is Permanent Soft Font.)
5. Font IO is lhe number you assign to permanent soft fonts when you download them
through your software.
l-30

..
OPERATION AND TIMING
CHAPTER 2
Il
1. This chapter describes ihe printer functions. the relationships between mechanisms and
circuits, and the timing of operations. Mechanical linkages are indicated by black and
white lines ( 11[1c 1. the ilow of control signals by solid arrows ( ___) 1, and the flow of
groups of signals by outline arrows ( I ---:>I.
2. An active-high signal is indicated by “H” or by a signal name without a slash in front of it,
such as “I’SNS”. Au active-low signal Is indicated by “L” or by a signal name with a slash in
front of, such as “/SCNON”.
A signal that is “H” or has a name without a slash is active at the supply voltage level
[indicating that the signal is being output). and inactive at ground level (indicating that the
signal is not being output).
A signal thal is “L” or has a slash in front of its name is active at ground level, and
inactive at the supply voltage level.
There is a microcomputer in this printer. But as the internal operation of the
microcomputer cannot be checked, an explanation of the operation of the microcomputer
has been left out.
As it is assumed that no repair will he made to customer circuit boards, the explanation
of board circuits is limited to an outline using block diagrams. So there are two types of
circuit explanation: (1) everything from the sensor to the input sections of the major circuit
boards, (2) everything from the output sections of the major circuit boards to the loads.
These are explained with block diagrams according to the function.
I. BASIC OPERATION . . . . . . . . . . . . . . . . 2-1 V. OVERALL CONTROL SYSTEM . . 2-36

II. LASER/SC%NNER SYSTEM..... 2-7 VI. POWER SUPPLIES.. ................ 2-65
III. IMfiGE FORMATION SYSTEM. 2-16 VII. ENVELOPE FEEDER.. ............. 2-56
N. PICK-UP/FEED SYSTEM . . . . . . . . 2-27 VIII. PAPER FEEDER.. ................... 2-60

A. Functions
Printer functions can be divided into five groups: the system interface, the overall control
system. the image-formation system, the laser/scanner unit, and the paper pick-up/feed
system.
To external device (computer, etc.)
- - - - _ _ _ _ _ _ _ _3 _ _ _ _ _ _ - _ - - _
r - - - - -
I
: SYSTEM INTERFACE I
I
3
,
I
I -----------______---------_-, I
4
---__------------____-~ l---------- ~_________,
d-1
; O V E R A L L C O
; N T R O L S Y S T E M ;
--------__ ----__1
I
I
&I C controller PCB I
I I
I Scanning mirror I
I
I-
iI
I ,
I----------
r__._-__.__----_--_-,I
----__----
I
I
I
k-l ’
I
8
’, Envelope feeder (optional) II
Cassette
i._._._._.“(~~~~-__._._._! SYSTEM
--___--_---------_______________________~~-----_-~ I
Figure 2-1
2-1

CHAPTER 2
B. Outline of the Electrical System

The operations of this printer are controlled by the microprocessor located on the DC controller
I’CU. When the power is turned on and the printer goes into standby, the microprocessor
outputs signals to drive the laser diode, motors. and solenoids in response to print commands
and image data from the exlernal device.
High-voltage
power supply
EXtemal Video DC controller

device controller PCB
PCB
Pick-up motor Sensorslmotorsl

drwer PCB solenoids
(Low-voltage
power supply)
b Fixmg roller
heater
Main swtch
Figure 2-2
2-2

CHAPTER 2
C. DC Controller Input Signals
5v DC controller PCB
b
‘SNS “H” when the delivery paper sensor

detects paper or when the delivery
?J caver IS open
Therm&or
Pick-up motor dwer PC6

__------
cassette paper *I) “L” when paper IS detected.

?&“SO, ‘2) “Y when Q+W IS detected
‘3) “H” when paper IS detected.
‘4) “Y when paper IS detected.
&gist paper
SF%“SOY
,
sensor PCB
I
__-_-__---A TJT
J701;602-Al ‘PA
-51 )/PA SLOl OUTPUT SERIAL LINE 1
Mulbpurpose tray -A2 ,MP SLll INPUT SERIAL LINE 1
paper end sensor I
-82 /PB
DOPEN ‘H” when the pnnter is open
.ASllST
1
-83 PB t5V
Muill-purpose tray
PS702 ’
-A4 MPS ‘3
paper Se”s”r -84 ‘MPE ‘4
-A5 ‘GND
;
-55 c’24VA
_______---,
SW603 SW604 SW605
SW602
k24VA
Test pnnt switch
lol
L.z-l
SW601
Door ape” sensing

swtch
EP cartrtdge High-voltage power Supply PCB

-----------I
, J74j:2_J_:j O_
SLl2 INPUT SERIAL LINE 2
SLO2 OUTPUT SERIAL LINE 2
I______L_----_
Co~necior PCB
Figure 2-3
2-3

CHAPTER 2
D. DC Controller Input/Output Signals (l/2)
,
Laser/scanner unit , c5v
DC controller
5206.1
,’ “L” to switch the laser ON forcibly.
/LON _’ “L” to watch the laser ON according to
/ENBL / the NDATA signal.
The laser switches ON when the /ENBL
N DATA ,” signal and this signal are “L”.
APCIN ~~ Avoltage proportional to the Intensity 01
APCCUT, the laser beam IS input.
The analog signal is output to adjust
the intensity of the laser beam
;ir
27
/BDI BD input signal (pulse)
e5V
_t
Scanner motor reference clock signal

-24VA
f
ISCNON ‘r to drive the scanner motor.
ISCNRDY “L” when the scanner motor reaches the
prescribed speed
connecter PCB Flxmg unit
4 t24VB
f
+5v
_f
TVIN High-voltage mon!tor signal
High-voltage ,
HVRST High-voltage reset signal
,ower supply
PCB I’NOUT Constant-voltage output signal
SLl2 INPUT SERIAL LINE 2
SLO2 OUTPUT SERIAL LINE 2
J131-1 J211-1
~____ IMRDY “c’ when the main motor runs
Mm motor correctty.
0
IMON “L” to drive the main motor.
I
Ml
-z
+24VB
2
Figure 2-4
2-4

CHAPTER 2
DC Controller Input/Output Signals (2/2)
DC COntrOller PC6
Power supply
.._-__-_______~
IFSRD “L’ to swtch the fixing roller heater ON.

RLD “L’ to deenerg,ze the relay OFF and
cut power to the fixing roller heater.
_---___l
I
L -1 -3 Output the thermistor voltage value
THOUT
connector PCB I :
Fixing roller
healer
Hl ’ I
“H” to run at high speed; “L” to r”” at

FAND- low speed.
FLOCK “L” when the exhaust fan operates
normally.
Y?7
Pick-up motor driver PC6
__--_____ _ _ _ _ _ _
, ,~~_~._~~
J601-1 JZOl-1
I I
I -?7
I
I
SLOl OUTPUT SERIAL LINE 1
: J701/602-Al: PA ‘1 SLll INPUT SERIAL LINE 1
I -El /PA ‘1 ; +5v
I -AZ’ MP *2
I _t
I -BZ: IPB ‘1 +24VB
I ‘1) Paper pick-up motor rotation
-A3’ 1 ST ‘3
I control
I -B3: PB ‘1 !
- ‘2) “H’ to operate the multi-
I -A4’ MPS purpose tray pack-up roller
I _..
I -84: MPE ‘3) .“H” tci operate the cassette
, -A5’ GND p,ck-up roller.
I YIT
I -85 : +24VA +24VA
I I
I I
I I
I I -i
I _ - - - -
I
I sensor PC6
.______-
Plck-up motor
Cassette pick-up
solenoid
Figure 2-5
2-5

CHAPTER 2
E. Basic Sequence of Operations

‘IXvo consrcutivc prints on A4 paper (Cassette feed)
Figure 2-6
Table 2-l
I’uind Purpose Remark

I
WwI Front powr’r--ON unlil tlw fixing To warm up the fLving roller to I
During this period, thr
[WAIT roller trmpt~r~tr~re I-pachrs 172°C put the printu in the standby printer checks the car-
pl-r”“l) state and clean the transfer i
(ridge is installed and
charging roller. there is toner in it.
STfN l’ron~ the end ut I ht. WAIT penod To hold the fixing roller at If the printer stays in the
(SI‘ANI)~S~~ urllil i3 /I’I<NT signal IS input from 172°C to keep the printw standby state for five
1 hc v1dro ro11trolh?r. or iron) th? lo prmt.
rnd th? LSTR until a the main motor for one
/I’KNT lo
second
coIltroller o r t hpow-r
e fixing roller, so that the
swltohed OFF fixing roller will no1 be
deformed.
INTH After Ihc /PKNT signal has been To stabilize the sensitivity of
(INl’lIAI, input front the video controller the drum in preparation for
lIO’I‘ATlONS until thr wanner motor beconws printing and to clean the
ptviod) ready (about ti seconds) transfer charging roller.
PRINT From the end of lhe INTH period To form an image on the During this period, the
(Print) until thr primary voltage [DC) photosensitive drum according printer holds the fixing
switrhes O F F to the /VDO signal input from roller at 183°C.
the video controller and to
transfer the image the paper.
LSTK ’~
After lhe primary voltage (DC) To deliver the final page of the If a /PRivf signal is inpu,
(IAS1 turns OFF until the main motor job and to clean the transfer from the video controller,
ROTATIONS stops charging roller. the INlTL4L ROTATIONS
period) period be#ns
I immediatelv.
2-6

CHAPTERS
The DC controller controls the APCOU’I

signal to set the APCIN signal to the
specified value to stabilize the intensity of
A. Outline the laser beam. (Control of laser beam
intensity: APC control)
External device The modulated laser beam is formed by
II a collimator lens and a cylindrical lens into
Video controller a parallel beam that strikes the scanning
,BD /“DO ,“SYNC mirror, which is rotating at constant speed.
t t t The beam is reflected from this mirror,
then brought to a focus on the photo-
,SCNON APCIN i”DATA ,ENBL LON APCOUTiBDl sensitive drum by the focusing lens in front
of the scanning mirror. The path of the
beam passing through the focusing lens is
changed by a mirror.
As the scanning mirror rotates al
constant speed, the beam is scanned
across the photosensitive drum. which also
rotates at constant speed. As the
photosensitive drum rotates, the laser
beam successively scans across its
surface. Thus the laser beam builds up the
latent image on the surface of the
Photosensitive
photosensitive drum.
drum
Figure 2-7
The DC controller receives the VIDEO

signal (/VDO) from the video conlroller and
sends it to the laser driver in the
laser/scanner unil as the /VDATA signal.
The laser driver lurns the laser diode on
and off according to the /VDATA signal
and generates the modulated laser beam
only when the VIDEO DATA ENABLE
signal (/ENBId) from the DC controller is
“L”
The laser activates the laser diode in
response to the AUTOMATIC POWER
CONTROL OUTPUT signal @PCOUT] when
the FORCIBLE LASER ON signal (/LON)
from the DC controller goes “L”, delects the
laser beam with the pholodiode adjoining
the laser diode, and sends an output
proportional to the intensity of the laser
beam to the DC controller as the
AUTOMATIC POWER CONTROL INPUT
RF'CIN) signal.
2-7

-
CHAPTER 2
B. Scanning Exposure across the drum and return to its original

The simplest example of exposure of the position, the drum surface ratates about 43
photosensitive drum by the Laser beam is )_trn (600 raster lines/inch). Successive
to imagine that both the drum and beam horizontal scans are therefore separated by
are stationary. In this case the laser beam this interval.
illuminates a single point on the drum.
Photosensitive
Scanning mirror
Video signal
V i d e o slgnal ’
Scanmng mlrlor
R@re 2-8 11 12 t3
Figure 2-10
When the scanning mirror is rotating and
the laser beam strikes one of its faces, the
reflected laser beam scans from one end of The surface of the photosensitive drum is
the photosensitive drum to the other charged to a negative potential by the
(horizontal scan). primary charging roller before printing
A broken line is produced by switching starts. When laser light strikes the
the laser beam on and off during the photosensitive drum during the horizontal
horizontal wan according to the VIDEO and vertical scans described above, the
signal I/VDO) electrostatic charge at that location is
neulralized. producing an electrostatic
Photosensitive latent image on the photosensitive drum
surface.
There is a small fixed beam-detect (BD)
mirror in the laser beam path. As the laser
beam is swept horizontally toward the
starting point for printing a line of data
lthe scanning start position), the beam
V i d e o signal \
Scanning mirror strikes the BD mirror and is reflected to
the sensor on the BD PCB. The laser beam
is converted to an electrical signal by the
Eyeure 2 - 9
sensor and the signal is sent to the DC
controller as the BD INPUT signal (/BDI).
When the photosensitive drum is also The DC controller produces the BEAM
rotating.in addition to the horizontal scan, DETECT signal (/BD) in response to the
the laser beam also advances around the /BDI signal. The /BD signal is sent to the
photosensitive drum (vertical scan). The video controller as a differential signal (BD,
photosensitive drum rotates at constant /BD).
speed while the laser beam scans across it. The laser is ON whenever the laser
In the time that the beam takes to sweep beam is not scanning the drum surface to
allow detection of the /BD signal. This
2-8

CHAPTER 2
signal is called lhe UNBLANKING signal

(UBL) a n d i s p r o d u c e d b y t h e D C
controller. The UBL signal is sent to the
laser driver as the FORCIBLE LASER ON
signal (/LON) to cause it lo switch the laser
diode ON when the /LON signal is ‘T’.
yl&ANKING stgnal nn n
Figure Z- 11
2-9
CHAPTER 2
C. Laser Control Circuit

1. Outline
DC controller Laser driver PC6

_____-._.-.-_- ~‘-__‘-_-‘-.-.
r--‘--
J207-17 ’ ND0
? T
J207-2&/BD .~
I
i._._._._._._._._._..
Figure 2- 12
This circuil switches the laser diode (LD) The CPU adjusts the value of the
ON and OFF at a constant intensity in APCOUT signal by changing the APCOR
response lo the /VDO signal from the video signal for coarse adjustment, and the
controller. The /VDO signal. sent from the APCOS signal for fine adjustment.
video controller to the DC controller, goes The output current of the laser current
to the switching circuit in the laser driver setting circuit is sent to the switching
circuit as it is as the /VDATA signal circuit and the laser diode is switched ON
The m i c r o p r o c e s s o r (CPU:IC201) and OFF in response to the /VDATA signal
outputs the INTENSITY CONTKOL signals when the VIDEO DATA ENABLE signal
[APCOR, APCOS) from the DA output ports [/ENBL, described later) is “u’.
to the analog adder circuit according to the
internal data. The AF’COR and APCOS
signals are added to this circuit at a ratio
of approximately 8 to 1, and then sent to
the laser current setting circuit located in
the laser driver as the AUTOMATIC POWER
CONTROL OUTPUT signal (AF’COUT).
2-10

CHAPTER 2
2. Control of laser beam intensity (APC output externally) to “H” and sets the
control] FORCIBLE LASER ON signal (/LON) to
The CPU performs aulomalic power control “L”.
(AI’C) of the laser diode to make the laser The CPU then changes the APCOS
diode ?miL constant light. This control can signal (fine adjustment]. compares the
be classified inlo two types: initial APC and input value of the APCIN signal with
between-page APC. the target value. and optimizes the
inlensity of the laser beam.
a. Initial AE’C
Inilial APC is performed to increase the
intensity of the laser beam from zero to
the targel value during initial rotation.
The CPU sets Lhc FORCIBLE LASER
ON signal (/LON) Lo “I,“, and at the
same time the CPU changes the APCOR
signal (coarse adjustment) and lets the
AE’COUT signal gradually rise from the
l o w v a l u e . A s lhe l a s e r currenl
increases. the laser diode (LD) begins
emitting light.
The intensity of ihe laser diode (LU)
outpuL is detected by the pholodiodr
(I’D). After amplification, the output
voltage is fed back Lo the CPU as the
AUTOMATlC POWER CONTROL INPUT
signal (APCIN).
‘Ihe CPlJ continues coarse adjuslment
unlil Lhr inpul value of t h e A P C I N
signal reaches 70% of the Larget value
stored in Lhe CPU. The CPU then does
fine adjustment with the APCOS signal,
and ends the initial APC when the
inpul value of the APCIN signal has
become almost equal Lo the larget
value.
b. Between-page AE’C
Between-page APC is performed afler
inilial APC, and when prinling is not
being performed while waiting for the
nexl page to proceed to the printing
area, Lo correcl variations in the
inlensity of 1 he laser printing.
Belwecn-page APC is also performed
during the unblinking period, described
IaLer. Lo prevent the laser beam from
writing on the image area of the
photosensitive drum.
The CPU sets the UNBLANKING
signal (UBL. used by IC202 and not
2-11

CHAPTER 2
3. laser diode emission control

Laser diode emission is controlled by VIDEO ‘Em -u- u&
signal (/VDOJ, which is sent from the video M S K -Tlr p

controller and processes the paper size data.
The paper size data is input to the CPU
from the cassette size sensing switches for
cassette feed and by the paper size
command from the video controller for
multi-purpose tray feed.
The CPU (IC201) transfers the /VDO
signal from the video controller to the laser
driver as it is as the /VDATA signal
The CPU sends data to the gate array
(lC202) to generate the IMAGE TOP ERASE
AND BOTTOM ERASE signal [TOPE) and
H O R I Z O N T A L M A S K s i g n a l [MSKI Figure 2-13
according to the paper size data from
lC202. (TOPE and MSK are used by IC202 Notes: 1. 0 Indicates the area where the
and not output externally.) laser beam writes on the drum.
To prevent the laser beam from writing 2. The duration of Tl & T2 vary
on the non-image area during the non- according to paper size. When
unblinking period, IC202 makes the using the multi-purpose tray
VIDEO DATA ENABLE signal (/ENBL) “L” the printer cannot comprehend
only when the TOPE and MSK signals are the width of the paper when the
“L”. The laser driver switches the laser ON paper size has not been
when the /ENBL signal is “L” and the specified by a paper size
/VDATA signal is “L”. command from the video
The gate array (IC202) generates the c o n t r o l l e r . Tl i s t h e r e f o r e
UNBLINKING signal (UBL) according to the specified as legal size paper
BD INPUT signal [/BDI) sent from the BD (maximum printable width).
PCB in the laser/scanner unit. IC202 sets
t h e U B L s i g n a l l o “H” d u r i n g t h e
unblinking period and sets the FORCIBLE
LASER ON signal (/LON). The laser driver
switches the laser diode ON when the
/LON signal is “L”.
2-12

CHAPTER 2
D. Scanner Drive speed.

1. Outline The scanner driver drives the scanner
motor when it is receiving the SCANNER
MOTOR DRIVE signal (/SCNON) from the
DC controller.
2. Scanner motor rotation control

Figure 2-15 shows the scanner motor
control circuit.
The scanner motor is a 3-phase, 8-pole
DC brushless motor containing a Hall
element, and forms a unit along with the
F$fure 2-14 scanner driver, which controls scanner
motor rotation at constant speed.
The key part of the scanner motor unit is
When the printer power is switched ON,
the scanntng mirror, which is a hexagonal
the oscillation frequency of the crystal
prism with mirror faces. It is mounted on
(X202) is divided by the gate array [ICZOZ),
the scanner motor shaft and turned by the
and the SCNCLK signal is sent to the
motor.
scanner driver.
The scanner motor is controlled by the
When the /PRNT signal that is sent to
scanner driver to make the laser beam
the CPU [ICZOl) on the DC controller
reflected from the scanning mirror scan
becomes ‘I”. the CPU sets the /SCNON
across the photosensitive drum at constant
DC controller
-.---.-.-.-_-.-.-.-.-.-.-_-.-.-.-_-
CPU (IC201) Gate array (IC202) +24VA ,
J207-IO
SC6llW3
motor/
I driver
/SCNRDYj 5205-6
NSRDY B l.“%
+5v !
i /SCNON 5205-7
I P62
!
Figure 2-15
2-13

CHAPTER 2
signal to “L” to turn the scanner motor.

When the scanner motor turns and
reaches the prescribed speed, the CPU sets
the SCANNEK MOTOR READY signal
(/SCNRDY) to “L”.
The CPU notifies a scanner error to the
video controller in the following cases:
a. When the /SCNRDY signal does not go

“V within 20 seconds after the scanner
motor starting rotation.
b. When the /SCNRDY signal goes “H” for

2.5 seconds after it goes ‘I”.
2-14

CHAFf-ER 2
The primary charging roller uniformly

applies a negative charge to the surface of
the photosensitive drum. To form the latent
A. Outline image on the photosensitive drum, the
The image formation system is the main laser beam modulated by the /VDO signal
part of the printer, and it consists of the illuminates the photosensitive drum
photosensitive drum, developing unit, surface.
charging roller. etc. The latent image formed on the
When the PRINT signal (/PRNT) is sent photosensitive drum is changed to a visible
from the video controller to the DC image by the toner on the developing
conlroller, the DC controller drives the cylinder, then transferred to the paper by
main motor to turn the photosensitive the transfer charging roller. The residual
drum, developing cylinder, primary toner on the photosensitive drum surface
charging roller, and transfer charging is scraped off by the cleaning blade. The
roller. potential on the drum is made uniform by
Carlridae
Laser beam ,/ ,-
Jpper fixing
-----I
1;
Video
controller “.
PCB INPUT SERIAL LINE (SLE)
pieure 2-16
2-15

tZ.HAPTER 2
the primary charging roller prior to

generation of a new latent image.
The cartridge has a toner sensor that
detects whether there is enough toner or
whether a cartridge is installed. If the level
of toner in the cartridge becomes lower
than the prescribed level. or if there is no
cartridge in the printer, the high-vollage
power supply PCB notifies the DC
controller via the serial line.
2-16

CHAPTER 2
B. Printing Process
The major part of the image formation system is contained in the cartridge. as shown in Figure
2-17.
/‘,
Laser beam /” C Cartridge
Primary charging roll
Transfer charging roller
/
Static charge eliminator
Figure 2- 17
The cartridge used by the printer has a Electrostatic latent image formation
seamless pholosensitive drum with the stage
structure shown in Figure 2- 18. The outer Step 1 Primary charge I-)
layer of the drum consists of an organic Step 2 Scanning exposure
p h o t o c o n d u c t o r (OPC): the base is
aluminum. Developing stage
The printing process can be divided into Step 3 Development
five major stages:
3. Transfer stage
Step 4 Transfer (+)
Step 5 Separation
-- Photoconductive
layer 4 Fixing stage
‘_ Base Step 6 Fixing
Figure 2-18 5 Drum cleaning stage

Step 7 Drum cleaning
Electrostatic latent image

formation staqe
+ Paper path
- Drection of drum rotation
Figure 2-19
2-17

CHAPTER 2
1. Electrostatic latent image formation The primary charging roller consists of

stage conductive rubber. In addition to DC bias,
This stage has two steps, which together AC bias is applied to the primary charging
produce a pattern oi elerlrical charges on roller to keep the potential on the drum
the photosensitive drum. surface uniform. This DC bias is changed
At the end of the stage. negative charges with the developing DC bias.
remain in the unexposed “dark” areas. This charging melhod has advantages
Charges are absent from the “light” areas, such as lower applied voltage. less ozone
where the laser beam struck (exposed) the generation, etc., compared with the corona
drum surface. charge system.
Since this image of negative charges on
the drum is invisible to the eye, it is called Step 2 Scanning exposure
an “electrostatic latent image”.
Laser beam
Figure 2-22
Figure 2-20
When the laser beam scans the drum
S t e p1 Primary charge surface. it causes the charge to be
neutralized in the areas struck by the
beam. Areas on the drum with no charge
form the electrostatic latent image.
Figure 2-21
As preparation for latent image formation,

a uniform negative potential is applied to
the photosensitive drum surface. The
printer uses the charging method that
directly charges the drum for the primary
charge.
2-18

2. Development stage Lo the laser beam have a higher potential
Development places particles of toner onto (are less negative1 than the negatively
the areas of the drum that have been charged toner particles on the developing
cleared of charge by the laser beam. This cylinder. When these areas approach the
makes a visible image. This printer uses cylinder, the potential difference projects
the toner projection development method the toner particles onto them. This is
with a single-component toner. called toner projection, and the latent
image on the drum becomes visible.
Step 3 Development
Developing cylinder
surface potential
Drum surface
t +” p0tf?W3
s‘ 0~~~~ (exposed area)
:-/
G -. DC bias
2
p _” /L-fkrR z Drum surface
Tlmet - potenllal
(unexposed area)
Figure 2-24
An AC bias is applied to the developing

cylinder to help project the toner particles
to the drum surface and improve the
contrast of the printed image. The center
T, ’ i Magnet
i voltage of the AC bias (1600 Vp-p) varies
DC bias with the DC bias voltage.
f The IMAGE DENSITY ADJUSTMENT
n5 signal (sent from the DC controller to the
Figure 2-23 high-voltage power supply via the serial
line) changes the DC bias, and thus the
potential difference between the cylinder
Note: The charges on the light areas on and drum. This changes the density of the
the pholosensitive drum are shown print.
as positive in this figure. Actually This printer has a stirring mechanism to
they are negative. hut they are supply toner in the cartridge smoothly to
more positive than the developing the cylinder.
cylinder and explanation is
simplified by regarding them as
positive.
As shown in Figure Z-23. the developing

unit consists of a developing cylinder and
rubber blade. The developing cylinder
rotates around a fixed internal magnet.
The single-component loner consists of
magnetite and a resin binder, and is held
to the cylinder by magnetic attraction. The
toner is an insulator, and acquires a
negative charge by friction due to the
rotation of the cylinder.
The areas on the drum that were exposed
2-19

CHAPTER 2
3. Transfer stage sets the charge on the drum to zero. In

In the transfer stage. the toner image is this case, the transfer voltage is made
transferred from the drum surface to the negative to remove the negatively-
paper. charged toner on the transfer charging
roller to the drum. The transfer charging
Step 4 Transfer roller is thus cleaned.
Step 5 Separation
Transfer chargmg roller Static charge

eliminator
Figure 2-25
F.&we 2-26
A posilive charge applied to the back of the

paper attrarls the negatively charged toner The stiffness of the paper causes it to
particles to the paper. The printer separate from the drum. (Curvature
accomplishes transfer by using lhe separation)
charging roller method. Advantages To stabilize the paper feed and prevent
compared with the corona transfer method small white circles from appearing in the
are as follows: printed image at low temperature and
humidity, the charge on the back of the
. Low transfer voltage that is less than half paper is reduced by the static charge
that for corona transfer eliminator after transfer.
. Less ozone generation
. The paper is supported by the transfer
charging roller and photosensitive drum,
so feed is more stable.
Reference:
If the image on the photosensitive drum
is not completely transferred to the paper
due to jamming, etc., the toner may
adhere to the transfer charging roller.
The printer removes the toner from the
transfer charging roller by switching the
transfer voltage between positive and
negative in sequence. During wait, initial
rotation, and last rotation, the printer
sets the primary DC voltage to zero, and
2 - 20

CHAPTER 2
4. Fixing stage 5. Drum cleaning stage

The toner image transferred to the paper in In the transfer stage, not all the toner is
the transfer stage is held only by transferred to the paper. Some remains on
electrostatic attraction and slight physical the photosensitive drum. This residual
adhesion, so even a light touch will smear toner is cleaned off in the drum cleaning
the image. stage so that the next print image will be
In the fixing stage, the toner image is clear.
fixed by heating the paper and applying
pressure. This fuses the toner particles to Step 7 Drum cleaning
the paper to make a permanent image.
Step 6 Fixing
Halogen heater
Cleaner container Sweeper strip
Figure 2-28
h Prior to the next printing, the residual

toner on the drum surface is scraped away
by the cleaning blade to clean the drum
Figure 2-27
surface. The removed toner is collected in
The upper roller surface is covered with a the cleaner container.
non-stick teflon tube. The upper and lower
roller surfaces are grounded via a diode to
prevent the negative potential of the upper
roller becoming higher than that of the
lower roller, resulting in the toner being
drawn to the lower roller. and adhering to
the lower roller surface.
2-21

CHAPTER 2
Reference: Toner projection development

Arlually. both unexposed and exposed areas of the drum surface have a negative potential,
but lo simplify the explanation, the drum potential is shown as positive when it is higher [less
ncgalivr) than the developing cylinder potential, and negative when it is lower (more negative)
than the developing cylinder potential.
Toner movmmmi and elerlrir potenlials Description
Th? electrostatic atlraction

raused by the difference in
potential between the drum
surface and Lhe cylinder is
sufficient to overcome Lhe
altraction of the magnet, so
of loner projected depends

on the DC bias volta@ on
I the cylinder.
~When the potential dif-
ference between Ihe drum
surface and the developing
i cylinder is reduced, the
~resulting weak electric field
, combines with the magnelic
field to attract toner back
from the drum to the
cylinder. This removes any
excessive toner adhering to
the drum. and improves the
contrast of the finished
print.
The drum surface potential
is only slightly higher than
the cylinder potential, so th,
magnelic attraclion to the
I cylinder is greater than the
electrostatic attraction to
the drum. Therefore, only a
small amount of toner is
projected toward the drum.
I The cylinder bias and the

magnetic force now
combine to strongly allrart
the toner to the cylinder,
- DC b,as IeYBI removing the excessive
’ Di”rn 3”TlacB toner from the unexposed
wtenw areas of the drum and
preventing fogging.
2 - 22

CHAPTER 2
C. High-Voltage Power Supply

1. Outline
In response lo an instruction from the microprocessor (MPU) on the DC controller PCF3, the
high-voltage power supply applies a voltage comprising the DC voltage and the AC voltage to
the primaly charging roller and developing cylinder and applies the positive or negalive DC
voltage lo the transfer charging roller.
+24V
t
J401-63
J401-B4 Primary
J401-B5
GND
J401-81
J401-52
J401-Al
J401-AZ
._..._......
HVRST
J401-A4
J401 -A3
TVIN
J401 -AE
J402-1 / ANT
GND
J402-2 /
J402-3 ,REF +
L I
Figure 2-29
2. Principle of operation circuit via the serial line, lhe high-

a. Primary charging roller voltage voltage power supply outputs the
generation primary DC voltage, and the primary
When the /PRNT signal from the video voltage comprising the AC bias and DC
controller becomes I”. initial rotation bias is applied to the primary charging
slarts, the HVT RESET signal (HVRST] roller.
becomes “H“, and the circuit outputs The primary DC bias changes with
lhe primaxy AC voltage to the primary the development DC bias according to
charging roller. When the PRIMARY DC the image density data senl from the
VOLTAGE ON signal is output to this DC controller via the serial line.
2 - 23

CHAPTER 2
b. Developing bias generation paper.

When the DEVELOPING BIAS DC ON After completion of printing, a between-
signal is sent from the DC controller via page and a negative biases are applied
the serial line, a developing DC bias is again to clean the transfer charging
applied to the developing cylinder. roller.
When the VERTICAL SYNC signal
(/VSYNC) is sent from the video d. Toner sensing/cartridge sensing
controller. the DEVELOPING BIAS AC The EP-E cartridge has a toner sensor
ON signal is sent from the DC that detects the toner level and whether
controller via the serial line, and the there is a cartridge when the developing
voltage comprising the developing DC AC bias is applied to the developing
bias and developing AC bias is applied cyltnder by the DEVELOPING BtAS AC
to the developing cylinder. ON signal.
The developing DC bias changes The detection result is sent to the DC
with the image density data sent from controller via the serial line.
the DC controller via the serial line,
and the image density can be adjusted.
AC bias
Figure 2-30
c. T r a n s f e r c h a r g i n g roller v o l t a g e
generation
A negative or between-page or print
bias is applied to the transfer charging
roller according to the print sequence.
A negative bias voltage is applied to
the lransfer charging roller during
appropriate time to move the toner
attached to the transfer charging roller
to the photosensitive drum, and so
clean the roller.
A print bias voltage is applied to the
transfer charging roller to transfer the
toner on the photosensitive drum to the
paper.
When the /PRNT signal from the
video controller becomes “L”, initial
rotation starts and a negative bias is
applied to the transfer charging roller
for a certain time to clean the roller. A
print bias is also applied during the
print sequence to transfer loner to the
2-24

CIFAPTER 2
Note: The transfer high voltage is switched according to the printing sequence, as shown below.
(A negaliw voltage is applied to the transfer charging roller to clean it.)
(A positive voltage is applied to the transfer charging roller to transfer toner

from the surface of the drum to the paper.)
l IA
I[w e a k : pBetween-page
ositive charge is applied to the transfer charging roller to prevent
bias excessive toner from collecting on the drum.)
Fi@rc 2-31
2 - 25
CHAPTER 2
This page intentionally left blank
2 - 26

CHAPTER 2
[SL70 1, SL702) energizes when the pick-up

motor is running, the pick-up roller (urns
A. Outline and feeds a sheet of paper into the printer.
The presence of paper on the multi- The paper stops at the resist paper sensor
purpose tray is sensed by photointerrupter (PS602). The video controller sends the
PS702, and the presence of paper in t h e VERTICAL SYNC signal after the paper
cassette is sensed by photointerrupter reaches the sensor, and the leading edge of
PS60 1. the toner image on the photosensitive
The presence and size of the cassette drum is matched with the leading edge of
installed in the printer are sensed by three the paper. The image is transferred, then
switches (SW603. 604, 605) mounted on the paper is separated from the drum, fed
the pick-up motor driver PCB. to the fixing unit, and delivered onto the
If the pick-up roller clutch solenoid face-down tray.
Pick-up motor driver PCS
1 /1”1” Delivery Aers
Photosensitive
PS201: Delivery paper sensor Cassette pick-up roller

PS601: Cassette paper sensor SW6
PS602: Aeglst paper sensor Cassette size
PS701: Multi-purpose tray paper end sensor Cassette sensing switches SW605
PS702: Multi-purpose tray paper sensor I
SL701: Cassetle pick-up roller clutch solenoid
SL702: Multi-purpose tray pick-up roller clutch solenoid
Figure 2-32
2 - 27

CHAFTER 2
The pick-up and delivery units have B. Paper Size Detection

photointerrupters IPS602. PS20 1) to detect Loading the cassette in the printer feeder
paper. If the print does not reach or clear actuates specific switches. From the
each sensor within a preset time, the combination of actuated switches (Table 2.
microprocessor on the DC controller 3). the microprocessor on the DC controller
assumes a paper jam has occurred. The detects the cassette size and the presence
DC controller notifies the video controller of a cassette.
of the jam.
Table 2-3
No cassette
This printer cannot detect the paper size

on the multi-purpose tray until the first
page has been printed. When the
universal cassette is used. the user sets
the cassette size, so there may be a setting
error.
The paper size is detected by the multi-
purpose tray paper end sensor (PS701) if
paper is fed from the multi-purpose tray,
and by the resist paper sensor (PS602) if
paper is fed from the cassette. If the paper
size is different from that specified by the
video controller. the microprocessor reports
a paper size error to the video controller.
2-28

CHAPTER 2
C. Cassette Feed - Paper path hrom multi-purpose tray

Each pick-up roller and the oblique rollers
of the pick-up unit are driven by the pick-
up motor IM2). When the video controller
sends the /PRNT signal to the printer, the
pick-up motor starts rotating.
After the pick-up motor rotates for 0.1
seconds, the pick-up roller clutch solenoid
(SL701) or the multi-purpose tray pick-up
roller clulch solenoid (SL702) activates for
0.3 seconds to rotate each pick-up roller.
The paper is fed by the oblique rollers so
Figure 2-33
that the edge of the paper touches the left
side plate lo correct skew. The paper stops
at the resist paper sensor (PS6021. The . Paper path hrom cassette
V E R T I C A L S Y N C s i g n a l (/VSYNC) is
received about 0.2 seconds after the pick-
up motor turns the oblique rollers.
The print paper is fed again.
Figure 2-34
Power-ON
(Unit: Seconds)
STBYl INTR 1 PRINT 1 LSTR 1 STBY
Figure 2-35
2 - 29

CHAPTER 2
D. Fixing and Delivery Unit SURFACE TEMPERATURE signal (FSRTH)

1. Outline decreases.
The upper/lower rollers of the fixing unit According to the voltage of the FSRTH
and the delivery rollers are driven by the signal, the microprocessor (CPU) on the DC
main motor (Ml). The upper roller is heated controller makes lhe FIXING ROLLER
by a fixing roller heater (H 1: 500 W. 115 V). HEATER DRIVE signal (/FSRD) “H” or “L”
The upper roller surface temperature is to set the upper roller surface temperature
detected by a thermistor (THI). As t h e to the appropriate value.
surface temperature increases. the The target temperatures of the upper
resistance of the thermistor ffH1) decreases, fixing roller during WAIT, STANDBY, and
and the voltage of the FIXING R O L L E R PRINT state are listed in Table 2-4.
DC controller PCB
.-_-.-~-.-._._.~__-
+5v
I,-Y :Pu(Ic201
AN12
P60
P61
I( AN16
P63
r-------
Figure 2-36
2 - 30

Table 2-4 2. Fixing unit error detection
The CPU assumes a fixing unit error In the
following cases, and informs the video
E r r o r m e m o r y c a p a c i t o r (C202)
charging detection
If the voltage at pin 74 (AN161 of the
CPU is 1.62 V or more (C202 is charged)
when the power is switched ON
b. Thermistor broken-wire detection

Notes: 1. If you print up to 25 envelopes If the upper roller temperature does not
continuously during normal reach 33°C within 22 seconds of the
temperature control, the target fiiing roller heater being turned ON
temperature is held at 183°C. If
you print more than 25 Fixing roller heater broken-wire
envelopes continuously, the detection
temperature is held al 178°C. If the upper roller temperature does not
2. Ii” the thermistor-detected tem- reach the standby temperature within
perature is 50°C or less when 200 seconds of the fling roller heater
the power is switched ON, this being turned ON
lemperature control is per-
formed for 15 minutes to Broken-wire detection after the fixing
improve fixing. unit becomes ready
If the upper roller temperature reaches
The printer has the following three 140°C in the standby state or during
protection functions to prevent incorrect printing
activation of the fixing roller:
e. Thermistor short detection
t The CPU monitors the thermistor If the voltage of the FIXING ROLLER
voltage. If it is abnormal, the CPU SURFACE TEMPERATURE signal
detects the fixing unit error. interrupts lFSRTH1 is 0.94 V (230°C) or less
the power to the fixing roller heater, and
reports it to the video controller. When the CPU detects a fixing error, the
. If the upper roller surface temperature following are performed:
rises abnormally and the thermistor
voltage falls below about 1.0 V (230°C). 11 Switches the fling roller heater OFF.
the safety circuil in the power supply 21 Sets the output from pin 27 (P63] to
interrupts the power to the fixing roller “H” and charges the error memory
heater regardless of the CPU output. capacitor (C2021.
. If the upper roller surface temperature 31 Sets the RELAY DRIVE signal [RLD) to
rises abnormally and the thermoswitch “L”, switches the relay OFF in the
temperature e x c e e d s 2 1 0 ° C . t h e power supply, and interrupts the power
thermoswitch turns off, interrupting the to the fixing roller heater.
power to the fixing roller heater.
2 - 31

When the power is switched ON, the CPU 3. Fixing roller heater start sequence
reads the voltage of pin 74 (ANI6J. If the The sequence of operations from power-on
voltage is higher than the specified value, to standby is as follows:
the CPU assumes a fixing unit error before
power-ON and cuts the current to the 11 The CPU turns the fixing roller heater
fixing roller heater. ON a preset time after power-ON (after
CPU initialization).
Note: If a fling unit error occurs, do not The CPU assumes a fixing unit error
switch the power on for about 10 when the upper fiing roller does not
minutes. As a safety measure, the reach 172°C (187’C for initial warm-
roller heater will not operate even if up) within 200 seconds after the fixing
you switch the power on during healer is turned ON.
this time. When the upper fixing roller temperature
reaches 172OC (187°C for initial warm-
up temperature control], the READY
signal f/RDY) is output to the video
controller.
4) After the /RDY signal is output, 172°C
(187°C for temperature control in the
morning] is maintained until the PRINT
signal [/PRNT) is sent from the video
conlroller.
upper flxlng roller

temperat”re (“C)
Normal pnnt
temperature
Standby temperature
I
Abnormally low
temperature-detectIon
~.__ ____~~~________ _-;._-__~_._~ temperature
0~
,
Power ON /RDY slgnal ON /PRNT slgnal ON Last ,ota,,on end Power OFF Time (sac)
Figure 2-37
2 - 32

CHAPTER 2
E Paper Jam Detection

To detect the presence of paper and whether or not the paper has been fed correctly, the
following paper sensors are provided:
. Resist paper sensor IPS602)
. Delivery paper sensor (PS201)
The microprocessor (CPU) determines if a paper jam has occurred by checking whether paper is
present at the sensor within the amount of time specified in the memory.
If it detects a jam. the microprocessor immedialely stops printing, and sends a signal to the
video controller to notify it.
1. Pick-up unit delay jam

The microprocessor detects a pick-up unit delay jam if the paper does not reach the resist
paper sensor (PSSOZ) within the required time after the paper is picked up,
/PRNT
(Unft Seconds)
v
SIBY INTRl PRINT 5
Cassette pnk-up roller clutch
solerod (SL701)
M? tray pick-up roller clutch
solenoid (SL702)
n
Pick-up command
\
Jam check +- Tl ~---+/
\I
Reglst paper sensor (PS602) Normal 1
-I
Main motor (Ml)
I I
1‘1: 3.76 swonds (upper cassclte). 2.85 seconds (multi-purpose tray).
I2.00 seconds (mvrlrrpc f&deer]
Figure 2-38
2. Pick-up unit stationary jam

The microprocessor detects a pick-up unit stationary jam when the resist paper sensor (PS602)
detects the sheet of paper within the required time after the VERTICAL SYNC signal [/VSYNC)
has been received.
/PRNT
(Unit: Seconds)
v
STBY INTR 1 PRINT I
VERTICAL SYNC REQUEST

signal (NSYNC)
Jam check
Reglst paper sensor (PS602) 1 Normal

I
Main motor (Ml)
‘I”2 7.24 seconds (A4). 6 39 seconds 185). 6.87 seconds (Letter). 8.49 seconds (Legal)
6.6 seconds (ExecutIveI. 8.49 seconds [Universal). 6.39 seconds (Envelope feeder)
Figure 2-39
2 - 33

CHAPTER 2
3. Delivery unit delay jam

The microprocessor detects a delivery unit delay jam if the paper does no1 reach the delivery
paper sensor (PS201) within the required time after the VERTICAL SYNC signal [/VSYNC) is
rweived.
/PRNT
(Untt~ Seconds)
V
STBY INTR 1 PRINT I
VERTICAL SYNC s,gnal (WSYNC)

I I
Jam check t- 5.2 _I
I I
Dellvery p a psense,
e r (PSZOI) 1
Figure 2-40
4.
Delivery unit stationary jam
The slationary jam when the delivery paper sensor
detects the sheet of paper within the required time when the paper passes through lhe
resist paper sensor (PSSOZ).
(Unit Seconds) (Unit. Seconds)
Reglst !xqer sensor (PS 602)

\ I
Jam check -I_- 5 3 -_I I - 5 . 3 -I
I \
Delwery paper sensor (PS201)
Man motor
Figure 2-41
5. Pick-up unit or delivery unit stationary jam

The microprocessor detects a pick-up unit or delivery unit stationary jam if the paper is at the
resist paper sensor (PS602) or delivery paper sensor (PS2.01) when the power is switched ON.
2 - 34

CHAPTER 2
B. Operation standby state.

When the power is switched ON. the
printer enters the WAIT state. When the
prinler is ready for operation, the READY
s i g n a l (/KDYl is sent from the DC
controller to notify the video controller that
the printer is ready. When the /RDY signal
is “L” and data for a page is ready, lhe
video controller sends the PRINT signal
(/PRNT) to the DC controller.
When the DC controller receives the
/PRNT signal, it s t a r t s t h e I N I T I A L
ROTATIONS (INTR] operations. A certain
lime after the INTR period, the DC
controller sends the VERTICAL SYNC
REQUEST signal (/VSREQ) to the video
controller. After video controller receives
the /VSREQ signal, it sends the VERTICAL
SYNC signal (/VSYNC) to the DC controller.
When the DC controller receives the
/VSYNC signal, it starts the print [PRINT]
sequence.
The video controller synchronizes the
VIDEO signal (VDO) with the HORIZONTAL
SYNC signal (BDJ and the VERTICAL SYNC
signal (VSYNC) sent from the DC controller.
and sends it to the DC controller. In
response to the /VU0 signal, the DC
controller generates the LASER DRIVE
signal (/VDATA) that switches the laser
diode ON and OFF. and sends it to the
laser driver.
The resulting laser beam is scanned
repeatedly across lhe photosensitive drum
by the mirror drum to form a latent
electrostatic image of the original data, as
described earlier.
When a page is being printed, the DC
controller checks for another /PRNT signal
from the video controller. If none has
arrived by the end of the PRINT period, the
DC controller begins the LAST ROTATION
(LSTR) operations. At the end of this
period, the printer enters the STANDBY
(STBy) state.
If another /PRNT signal arrives during
printing. however. the print sequence
continues. The LAST ROTA’IlONS operations
are performed, and the printer enters the
2 - 36

CHAPTER 2
b. Banding Coprocessor interface.

The banding coprocessor is an Intel
8296 1 KU printer coprocessor that Parallel Port Interface
integrates a graphics accelerator and A 256 byte FIFO is used to buffer
compression processor necessary for printer data from the Host parallel port.
complex page description language JllO serves as the connector for the
(PDI,) c o n t r o l l e r s . It p r o v i d e s a l l parallel port interface. The Generic
necessary system control for the CPU to Array Logic device (GAL21 controls the
dirrctry interface to DC controller. It transfer of printer data over the Host
has the following main functions: parallel port.
.Interleaved KOM Control
.DRAM Control Engine Interface
.Printer Video Interface The engine interface, both video signal
.Printer Communication Interface generation and print engine communi-
.1/O Bus Interface support cation. is controlled by the 82961KD
The Generic Array Logic device (GAL11 device.
generates DRAM RAS control signals
under direction from the 82961KD. Video Logic
Logic is provided to select the video
c. DRAM clock frequency supplied to the
The Conlroller contains two banks 82961 KD 8X PLL cicuit. Selections are,
(1MByle rach) of DRAM soldered on 59.64024 MHz clock for 600 x 600
board, and two 72.pin DRAM SIMM resolution. 14.910506 MHz clock for
modules. Each SIMM module can 300 x 300 resolution, or an external 1X
contain 1. 2. 4. 8. 16 or 32 MBytes of clock for 1200 x 1200 resolution.
memory. The DRAM is used for storing
print data. video data, fonls, and j. External Video
variable data used for program control. The connector J 140 is provided to
support video post processing features
d. ROM such as resolution enhancement or
The Controller contains one bank of resolution doubling. In addition, it can
Page Mode ROM and two 72.pin KOM be used to provide clocks not provided
SIMM modules. The Page Mode ROM by controller, supporting non standard
may be 2 or 4 MBytes. The two SIMM print engine resolutions.
modules may be from 1 to 16 MBytes.
ROM is used for storing the Controller’s 1. PSI0
program and font data. The external I/O Slot (connector 5172)
supports user installed Host I/O
e. EEPROM controllers such as AppleTalk and
The 2 KBit serial EEPROM is provided Ethernet. An 80.pin connector is used
for non-volatile storage of the printing to interface to the 8096OKB processor
environment, number of prints, and so LAD bus. In addition, this connector
on. provides for the addition of a video
adapter interface that allows for
f. Serial Controller superimposed video on the existing
The NS16550A Serial Controller is used video data supplied by the 82961KD.
as the interface to the Host serial
RS232/RS422 port for printer data.
JlOO serves as the connector for this
2 - 38

ClMPTER 2
Figure 2-45
m. PCMCIA Interfxe 3. Connectors

The PCMCIA Inlerfare (connector J 120) The following is a summary of the use for
is supported by dedicated logic. This each connector:
Generic Array Logic device (GALS)
generates the control signals and Connector Use
effects data transfers over the The
PCMCIA interface. 5130 Engine Interface
5131 Front Panel
n. Front Panel 5140 External Video
The control panel contains 10 LEDs. J110 Host Parallel (Centronics) Port
one vacuum fluorescent display (VFD), JIOO Host Serial Port
7 swilches. and a beeper. The function 5171 External Debug Port
of the front panel is to display status 5172 External I/O Slot
and error messages, allows the 5120 PCMCIA
operator to select the printing
environment, operating modes. and
paper sources.
2 - 39

CHAPTER 2
D. Control Panel b. Displays the printer operating states

1. Outline with LEDs.
This control panel contains 10 LEDs, c. Selects the printing environment,
one VFD (vacuum tluorescent display), operating mode, utility, and paper
7 switches, and one beeper on the source with switches.
control panel. The control panel is d. Sounds the beeper if a switch input is
connected to the video controller PCB, ineffective or an error occurs.
and has the following functions.
a. Displays status and error messages on
the VFD.
Video controller PCB Control panel
L.-.--.-.-. .-.-.-_-----.__-.-.--
FigUre 2-46
2. O p e r a t i o n Table 2-5
The LEDs, VFD, and beeper on the control
panel are controlled by signals from the Pin No. Signal name Meanning
video controller. All signals generated by Jl-1 vcc +5v
control panel switches are input to the 51-2 GND GND
video controller. Table 2-4 lists the input 51-3 /PCLK Panel CLock
51-4 /VPDCS VFD Chip Select
and output signals.
Jl-5 /PWRD Panel Write Data
Jl-6 /LEDWR LED data WRite
51-7 /PRDD Panel ReaD Data
Jl-8 /SWRD Switch ReaD
Jl-9 /HDLED Hard Disk LED
Jl-10 /LED08 LED08
51-11 BUZ BU?&VX
51-12 / PNLRST PaNeL ReSeT
51-13 GND GND
51-14 VCC +5v
2 - 40

-
CHAPTER 2
E. Self-test the READY indicator, ONLINE

When the power is switched on, the printer indicator, and the paper pick-up mode
executes the self-diagnosis program for the indicator light, and “00 READY AUTO”
video controller to check the video appears on the Status indication
controller and control panel states. This display. If any operator call or error
function is called the self-test. The self test occurs. it is indicated by an indicator
procedure is as follows: and the Status indication display.
1) Self-diagnose the CPU. Any errors
encountered during the test are If a hard disk drive is connected to the
displayed on the Status indication printer, the hard disk drive state is
display as service calls. checked during the self-test. If an
2 ) A f t e r t h e C P U c o m p l e t e s a self- error is detected in the drive (for
diagnosis. the video controller will also example, the power was turned off
execute a self-diagnosis. Any errors during access to the drive), it is
encountered here are also displayed on recovered automatically during the self-
the Stalus indication display (VFD] as test period (by the simple recovery
service calls. program). See Section V of Chapter 1
2- ])A11 LEDs light lit and all digits on the for details of the simple recovery
VFD are displayed. The communi- program.
cation between the CPU and the IOP
are subsequenently checked.
2-2)The fish wll then be displayed and the
check will be performed. While the fish
are being displayed. the RAM (internal
RAM and expanded RAM SIMM) will
mainly be checked. and the time will be
displayed depending upon the memory
capacity of the expanded RAM. The
following checks arr made during this
iime.
-Check whether an optional RAM
SIMM is inslalled (checksum check if
it is installed)
- Check internal ROM checksum.
. Internal RAM check
. IOP check
. SCSI controller check
. Optional RAM SIMM check
. Engine check
- SRAM check
2-3)When the checks end. all LEDs are
turned off. This state lasts for about 3
seconds.
2-4)The READY indicator flashes once.
2-5)All VFD digits are cleared.
3) The READY indicator flashes until self-
diagnosis ends and the printer goes
into standby.
4) When the printer goes into standby,
2-41

CHAPTER 2
F. Status/Error Message
The following pages show the explanations and corrective actions of status and error messages
which are shown in the Status indication display while the printer is operating. Figure 2-47
shows how messages appear on the Slatus indication display.
Figure 2-47
If a warning message, operator call, or error occurs. the field number lights or flashes. The
printer can display messages on the Status indication display in another language by changing
the printing environment setting. [See page l-23 for details.]
2-42

l.Statu.9 messages
A status message shows printer operating state when the printer is operating normally.
Status indiration display 1 /

Description Measure
In,b?r rirlrl hhsagr ilrld
00 HEADY Ready stale
Note:You can specify a READY message
in each operating mode. Thm is the
default message.
JOB REIJECT The Job in which an error occurred is
being skipped.
T
01 TESI’ PRINT A ‘Self Test Is being printed.
FONT LIST A font list is being printed.
SOFT 01’~ION ~ A macro or overlay form registration
number is being printed.
OVERLAY PRINT An overlay form is being printed.
STOP Utility printing stops.
02 WARMING UP Warming up
03 RES!ZT Reset
05 FORM FEED ~
Form feeding is in progress.
FORM FEED STOP Form feeding stops.
06 HEX DUMP Hexadecimal dump mode is set.
15 ENGINE TEST The engine test print is being uerformed. i
2 - 43

CHAPTER 2
2. Warning messages
When a warning message is displayed, the operator should take the appropriate action, but
does not need to stop the printer operation.
Slatus indication display 1 Description Measure

NUrnbtY lkki Message kid
16 1TONER LOW 1 The toner level is low. Get a new toner carhidge.
17
t The upper or lower cassette is empty in Put print paper in the
~FEEDER EMm automatic paper pick-up mode. (If both cassette.
’ the upper and lower cassettes are
iempty, “1 1 PAPER OUT is displayed.)
Note: “TONER LOW” will only be displayed when the toner-low MODE value has been set to
“WARNING” in the printing environment.
3. Operator call messages

Operator call messages are displayed to prompt the operator to take appropriate action if
printing should be stopped. If an operator call message is displayed, the printer stops printing
and goes off line. After the operator takes the correct action, the printer resumes printing.
Status indication display Description MeaSUre

wnber llrld Message “&I I
11 PAPER OUT paper supply request Load a cassette containing
There is no print paper at the selected print paper at the selected
paper source or no cassette is loaded. 1paper source. or select a
~paper source containing
print paper.
12 I PRINTER OPEN Printer door open Close the upper cover
The upper cover of the printer is open. completely, then press the
ON LINE key.
1 ~_~~~~ - ~~~~
13 ; PAPER JAM Paper feed check Open the upper cover or

A paper jam has occurred. paper delivery cover,
Note : This message also appears when remove the jammed paper,
the paper delivery cover is open. then press the ON LINE
kw
14 NO TONER CART. No EP-E cartridge Install the cartridge
No EP-E cartridge is installed or the properly, then press the ON
cartridge is not tnstalled properly. LINE key.
2 - 44

CHAPTER 2
dication display Description Mea?.LX-e

MPssa~e l,elli
TONER LQW The toner level is low. Take the cartridge out.
shake it as instructed in
Section II1 of Chapter 4.
reinstall it. and print. If this
message is dlsplayed again,
replace the cartridge, then
press the ON LJNE key.
t Load the cassette contalng
LOAD A4 Paper cassette replacement request
LOAD 85 This occurs when a cassette is being the paper specified in the
LOAD LEX-I-ER used, the paper size specified by the message, or select the paper
LOAD LEGAL paper size command sent from the source containing the
LOAD EXECTIVE external detice (host compoter, etc) to specified paper. If the
LOAD PAPER nn the printer is different from the current universal cassette is being
,size of paper loaded in the printer. used, change the paper size
nn : Paper size specified by the to the paper size specified in
translator the message, load paper,
I then load the cassette
I again. When the ON LINE
key is pressed, printing
resumes. In this case, the
paper in the current
cassette loaded in the
printer is printed on.
However, it is not
guaranteed that images will
be printed correctly: that is.
an error may occur in the
printed image.
c
MF FEED A4 Mulli-purpose tray paper replacement Load the paper specified in
FEED 85 request the message on the
FEED LEXTER This occurs when the multi-purpose multi-purpose tray. or selec
~FEED LEGAL tray is being used. The paper size the paper source containing
FEED EXECTM? specified by the paper size command the specified paper. If the
‘EED PAPER nn sent from the external device (host universal cassette is being
compoter, etc) to the printer is used, change the paper size
different from the current size of paper to the paper size spedfled ir
loaded in the printer. the message, load paper,
nn : Paper size specified by the then load the cassette again
translator When the ON LINE key is
pressed, printing resumes.
In this case, the paper in th
current cassette loaded in
the printer is printed on.
However. it Is not
guaranteed that images will
be printed correctly: that Is,
an error may occur in the
printed Image.
Note: ‘TONER Low” will only be displayed when the toner-low MODE value has been set to
“STOP” in the printing environment.
2-45

CHAPTER 2
NU NO UPPER CASS. Upper cassette installation request Load the upper cassette, or
Paper cannot be fed from the lower select another paper
cassette because the upper cassette Is so”K.2.
not loaded.
o c Operator comment
(User-defined operator call)
XX...xXx is a messa@ specified by the
Display Comment 1 command. This
command sends the message from the
external device Lo the printer.
2-46

CZMPTER 2
4. Error messages
If an error occurs and correct printing is not guaranteed, an error message Is displayed. When
the ON LINE key is pressed (error skip), printing may be possible in some cases, but correct
printing is not guaranteed. To print correctly, take the appropriate action and send the print
data again. If an error occurs and this message is displayed, the printer stops printing and
goes off line.
21 1LOW RESOL. ~Development resolution reduction

~The printer cannot utilize 600 dpi when
~there is complicated or excessive data on
: one page. This unit can only print 300
1dpi in this case. resolution of 600 dpi. install
optional RAM SIMMs (4 MB
I or more). and set “memory
usage” to “FULL PAINT’ In
the printing environment.
I
Data IS not prlnied correctly even if the When the ON LINE key is
‘OMPLEX ‘*‘* 1 resolution is reduced. pressed, printing continues.
j Since there is very complicated or much However. correct image
~data on one page. It cannot be printed printing is not guaranteed.
even if the resolution is reduced to 300 Advice the customer to add
~dpi. an optional RAM SIMM. If
this error occors when Legal
size is used. take one of the
following measures:
- Install optional RAM
SIMM% This guarantees
that data is printed with a
resolution of 300 dpi.
Install optlonal RAM
SIMMs (4MB or more). and
set the “memory usage” to
“FULL PAlN’l”’ in the printing
envtronment. This
guarantees that data is
printed with a resolution of
600 dpi.
22 LINE ERROR Receive buffer memory overflow Press the ON LINE key to
Even though the printer Is busy (I. e.. continue processing.
not ready to receive data from the Overflow data is not printed.
1external device), the external device If this error occurs
continues sending data to the printer, frequently, check the
and the temporary memory [receive connection of the interface
buffer) overflows. cable between the external
device and the printer, and
check interface conditions.
When the connection or
interface condition are not
properly functioning, set the
optimum conditions.
2 - 47
CHAFTER 2
Stalus indication display

Description Measure
ulllbrr 1,rldl ,vessaer lirld
23 i MEMOUY FULL Download overflow Take one of the following
The pattern data memory overflowed l”eaS”rlZS:
because there was too much pattern Press the ON LINE key to
data (downloaded data) for forming receive data from the
user-defined characters [character font) external device. The
sent from the external device to the overflow pattern data is
printer. invalid.
Stop printing (see Section
V of Chapter 1). then enter
data again in online mode.
If the error occurs again.
advise the customer to
check input data (erase
unnecessary downloaded
data, etc.) or add an
/ optional RAM SIMM. If a
hard drive is installed, ask
the customer to switch the
power OFF, wait about two
seconds. switch the power
ON, then download data
again.
26 MEMORY FULL Work memory overflow When the ON LINE key is
The specified function cannot be pressed, the error is
executed because of insufficient Internal cleared. and the printer
working “wnory (video controller). accepts data from the
external device. However,
the function which
experienced a” error cannot
be executed. Check whether
a” optional RAM SIMM has
been installed. If not, advise
the customer to add a RAM
SIMM.
27 JOB RE??ECT Translator missing Press the ON LINE key so
! The translator specitied by the the job in which the error
’ command from the external device does occurred 1s skipped. [The
not exist, or command parameters are document will not be
not correct. prlnted. but the following
document will be printed.)
Then add the specified
translator or correct the
command.
28 MEMORY FULL Drawing working memory overflow Press the ON LlNE key to
1! Since there are very complicated continue processing.
j graphics on one page. they may not be Advise the customer to add
1printed correctly. a” optional RAM SIMM.
2 - 48

CMAPTER 2
Description
40 ~LINE EKROR Line error Perform the following

Data from the external devxe was not procedure until the error is
received correctly when the serial corrected.
, interface (RS-232C) was used. 1)Press the ON LINE key to
1Reference : When this error occurs. all resume data reception.
pages before the page where the error 2)Check the connection of
occured arr printed, and this message is the interface cable between
displayed. the external device and the
printer. and check interface
I conditions. (baud rate. data
length, etc.) If any interface
conditions are Incorrect, set
the optimum conditions.
1
41 ) PRINT CHECK Print cherk request Remove the printed paper
I ,A temporary error occured in a printed from lhe tray, and press the
image. If this error occures, unwanted ON LINE key to continue
I i
horizontal lines appear in the plinted printing. The page where th
image. error occurred is printed.
The paper siw selector of the universal Set the paper size selector 01
cassette is not set correclly. (The
paper Ithe universal casselle
~size in lhr cassette is different.1 correctly. Press the ON
, LINE key to resume printing
from the page in which the
error occurred.
I
OF OITI‘.REMOVAL Envelope feeder installation/removal Turn the power OFF and
error ON again.
The envelope feeder was installed or
I removed when the power was turned ON.
FF CARD REMOVAL Font card installation/removal error Turn the power OFF and
~The font card was installed or removed ON again.
~when the power was turned ON.
I
FF FONT FULL Fonl registration full Press the ON LINE key to
Since too many character sets are receive data from the
registered in the printer, no more fonts external device. The font
can be registered. registration of the character
set in which the error
occurred is ignored. Remow
I unnecessary fonts.
2 - 49

CHAPTER 2
Status Indication display 1 Description Measure

Nurnbrr nr,<, MesbagP na,
I I
WF WORK FULL ! Translator working memory overflow Turn the power OFF and ON
! The specified tranlator cannot find again. If the error occurs
1enough working memory. again. advice the customer
to add an optional RAM
SIMM.
NF NVR4M FULL Insufficient NVRAM area Initialtie with the INITIALIZE
The specilled translator cannot find group on the group setup
enough NVRAM area. menu.
Note: This error occurs only if the
/ optional translator is used.
2 - 50

CHAPTER 2
A serviceman call is displayed if a serious unrecoverable error occurs and serviceman

maintenance is required. If a serviceman call is displayed, switch the printer OFF, and take
appropriate action. Serviceman call codes are classified by the number field code number. and
the error contents are indicated by a detailed number. The calls are classified by code number
as follows:
Code number Locatio_n Lcags&
5F Printer engine
6F Video controller PCB
8F Communication between the DC controller and video controller
AF Software in video controller
The serviceman call with code number AF is displayed if the software in the video controller is
erroneous, so its cause cannot be identified easily. If this call occurs. turn the power OFF and
ON again. If the call occurs again. report the code number, detailed number, and detail of the
error occurrence to the service departments of Canon sales companies.
a. Printer engine serviceman call
5F-50 SERVICE 1 E. iwing unit failure Turn the power OFF. leave
1Reference : If this error occurs, turn the the printer for 10 minuets.
I power OFF. leave the printer for about then turn the power ON
, 10 minutes, then turn the power ON again. If the error is
~again. If the power is turned ON again dfsplayed again, perform the
before 10 minutes is up, the printer troubleshooting procedure
displays this message and interrupts the described in Section V of
power to the fixing unit Lo prevent Chapter 6.
overheating of the unit even if the fiing
unit functions normally.
5F-51 SERVICE : BD failure Perform the troubleshooting
Since the laser beam intensity has procedure described in
I decreased or the optional system has Section V of Chapter 6.
/ failed, the horizontal synchronizing
signal (/BD) cannot be sent from the DC
contrller to the video controller.
53-52 SERVICE Scanner failure Perform the troubleshooting
The scanner motor does not run at the procedure described In
specified speed. Section V of Chapter 6.
53-54 SERVICE Main motor failure Perform the troubleshooting
The main motor does not run at the procedure described in
specified speed. Section V of Chapter 6.
5F-5F SERVICE Printer power off Check whether video
The/PPRDY signal of the video interface interface connector 5207
is not true. (Jll is making proper
contact.
2 -51

CHAPTER 2
b. Controller serviceman call
Description MfXlsUre
I
Internal ROM checksum err”r Turn the power OFF and ON
i The contents of the ROM on the video again. II” the err”r persists,
1conlroller are incorrect. replace the video controller
PCB.
6F-63 S E K V I C E Internal RAM error Turn the power OFF and ON
Data cannot be correctly read from or again. If the error persists,
written to the DRAM located on the replace the video controller
video controller. PCB.
6F-68 S E K V I C E NVRAM errOr Turn the power OFF and ON
Data cannot he correctly read from or again. If the error cannot be
1 vcitten to the NVRAM (EEPROM) located corrected, replare the
~on the video controller. EEPROM (IC 16).
6F-69 S E K V I C E Extended interface err”r Turn the power OFF and ON
The r‘qonsr from the extended interface a@~. If the error cannot be
~PCH is not input to the video controller corrected, replace the
~PCB within the prescribed time. extended interface PCB or
I video controller PCB.
6F-75 S E R V I C E i /VSREQ signal errOr Turn the power OFF and ON
If the /PRNT signal is false. the /VSREQ again. If the error cannot be
signal is output from the DC controller corrected, replace the DC
to the video controller PCB. controller PCB or video
controller PCB.
6F-77 I SERVICE No /VSYNC signal Turn the pow& OFF and
The /VSYNC signal is not oulput within ON again. If the err”r
the prescribed time after the video persists, replace the video
controller PCB receives the /VSWQ controller PCB.
signal from the DC controller PCB.
6F 7A SERVICE Gate array internal SF4AM error turn the power OFF and on
Data rannot be correctly read from or again. If the error cannot be
written to the SRAM in the gate array corrected, replace the video
IGAl). controller PCB.
_~
6F-90 SEKVICt? IOP internal ROM error Turn the power OFF and
The contents of the IOP ROM are ON agaln. If the error
incorrect. cannot be corrected, replace
the video controller PCB.
6F-9 I 1 SERVICE IOP internal RAM error Turn the power OFF and On
I ’ Data cannot be correctly read from or again. If the error cannot
1written to lhe IOP RAM. be corrected, replace the
video controller PCB.
I
6F-92 ’ SERVICE Communication error between CPU and Turn the power OFF and On
’ IOP again. If the err”r cannot be
The CPU cannot communicate with the corrected, replace the video
controller PCB.
6F-93 i SERVICE Interrupt err”r between CPU and IOP turn the power OFF and on
The IOP does not generate a correct again. If the errOr cannot
interrupt to the CPU. be corrected, replace the
2 - 52

CHAPTER 2
Status indiration display ~ Description M~W%U-~

,mbrr liridl MessaRc ,,c,<3
6F-94 SERVICE Extended ROM checksum err”r Turn the power OFF and ON
Font data in the extended ROM SIMM again. If the error cannot be
~ is destroyed. corrected, replace the

extended ROM SIMM.
6F-95 SERVICE Extended RAM I error Turn the power OFF and ON
Data cannot be correctly read from or again. If the err”r cannot
written to the extended RAM SIMM. be corrected. replace the
i extended RAM SIMM.
6F-96 SEKVICE Extended RAM 2 err”r Turn the power OFF and
iDala cannot be correctly read from or ON again. If the error
I written lo the extended RAM SIMM.
i ~2Jf~f~p~fn~~~
6F-98 SERVICE SCSI loopbark crr”r
Data
cannot be read from or written to 1a@in.If the error cannot be
,the SCSI ronlroller. corrected, replace the video
I controller PCB.
6F-99 ’ SEKVICE SCSI IC inlerrupt err”r Turn the power OFF and Oh
The SCSI controller cannot generate a again. If the error cannot bt
~ correct interrupt. corrected. replace lhe video
controller PCB.
6F-91) ~SERVICE CPU error Turn the power OFF and Oh

I A CPU error occurs. again. If the error cannot be
corrected. replace the video
controller PCB.
&
GP-YC S E R V I C E * Crystal timing error
Turn the power OFF and OF
The clock frequency of the CPU and IOP
again. If the error cannot
i is incorrect.
be corrected, replace the
2 - 53
CHAPTER 2
c. Engine/Controller communication serviceman call
Description MeZ5LlIY2
I
R F - 8 0 SEHVlCE Command status timeout Turn the power OFF and ON
The DC controller PCB does not send a again. If the error cannot be
status to
the video controller PCB wlthin corrected, replace the video
the presrribed time after the DC controller PCB or DC
controller PCB receives a command. controller PCB.
1
Command slatus parity error Turn the power OFF and
~A parity error is found in a command or ON again. If the error
I status during communication between cannot be corrected, replace
the DC controller PCB and video the video controller PCB or
controller PCB. DC controller PCB.
HF.85 Sl?RVICE IVSREQ signal timeout Turn the power OFF and ON
I The DC controller PCB does not send a again. If the error cannot be
~IVSKEQ signal to the video controller converted. replace the DC
PCH within the prescribed time after controller PCB.
the DC controller PCB receives a /PRNT i
signal.
AF-86 SERVICE Invalid command sent Turn the power OFF and ON
The video controller PCB sends an again. If the error cannot bc
~invalid command to the DC controller corrected. replace the video
IPCB. controller PCB.
SF-87 SERVICE Printrr engine error Connect the video controller

The video PCB is connected to the wrong PCB to the correct prtnter
printer engine. engine.
2 - 54

e
CHAPTER 2
A. Outline
The AC line voltage is supplied to the low-voltage power supply circuit in the power supply by
turning the power switch (SWIOl) ON.
The low-voltage power supply circuit generates +24 VDC and +5 VDC. The +24 VDC is
supplied to the main motor. scanner motor, and exhaust fan to drive them, and to the high-
voltage power supply I’CB. The +5 VDC is supplied to the sensors and Es on the DC controller
PCB.
The +24 VDC consists of two types of voltage: +24VA, which is normally supplied from the
power supply, and +24VB, which is cut when the upper cover is opened and the door switch
(SW601) is turned OFF.
The block diagram is shown below.
Power supply
-_-_-.-_-_-_-.-_-.-_-.-.~-.-.-.-_
13 ,I
i! i
-._ic-
To fixing roller heater
Figure 2-48
B. Protective System
II’ a short circuit or other fault causes excessive current from the +24 VDC and +5 VDC power
supplies, the overcurrent protection system automatically shuts off the output voltage to
protect the power supply. To reset the power supply after such a shutdown, switch the power
OFF, correct the fault, then switch the power back ON again. If overcurrent flows through the
AC line. the circuit breaker in the power supply trips and the output voltage is shut off.
2 - 55

CHAPTER 2
B. Pick-up/Feed System receives a 1st Start command from the DC

The envelope feeder pick-up motor (M4) is controller, it runs the pick-up motor
a stepping motor that rotates forward or forward for about 1.8 second, pauses for 0.1
backward and is controlled by the envelope seconds, then runs the motor backward for
f e e d e r driver PCB. When the motor rotates about 2.3 seconds. One envelope is picked
forward, all of the envelope rollers rotate. up and fed into the printer by the oblique
while only the upper separation roller and rollers so that its end touches the left side
the feed roller rotate when the motor plate to correct skew. The envelope stops
rotates backward. when it reaches the resist paper sensor
When the envelope feeder driver PCB (PS602).
~.....‘..“...“__.“““...“““‘_.~~~, ;“_“‘~‘“_....‘-“‘~‘._~.‘....~.....~’
DC controller PCB Pick-up motor driver PCB
I Envelope feeder driver PCB

I
Envelope f$&er
Envelope feeder
feed roller
pick-up motor
Regist paper sensor

(PS602)
i
Figure 2-50
2 - 57

CHAPTER 2
When it receives a 2nd Start command, the

envelope feeder driver PCB runs the motor
backward for about 2.8 seronds to feed the
envelope again.
Power-ON
Figure 2-51
The upper separation roller is driven via a

torque limiter by th? motor, which imparts
a tur-ning moment in the direclion of Upper separation roller
r o t a t i o n o f the p i c k - u p a n d l o w e r
separation rollers [in the direction of the
white arrow in Figure Z-52).
When a single envelope is fed, however,
the upper separation roller is forced to
Lower separation roller
rotate in the opposite direction (in the
direction of the black arrow in Figure 2-521 Upper separation roller
by the movement of the envelope, which is
driven by the lower separation roller.
Normal
Since the friction between the envelopes
is weak when two or more envelopes are
fed simultaneously (multi-feed). the
rotating force of the lower roller is not
strong enough to cause the upper roller to Upper separation roller
rotate in the same direction as it is
rotating. The upper roller rotates in the
Multifeed
direction of the white arrow in Figure 2-52.
and the envelope on the bottom of the
feeder passes through while the others are
returned to the feeder.
Figure 2-52
2 - 58

CHAPTER 2
C. Paper Jam Detection

Paper jam during pickup or leeding from
the envelope feeder is detected in the same
way as l’or a printer paper jam detection.
See pa@ 2-33 fir details.
2 - 59

A. Outline of the Electrical System
The DC controller controls the paper feeder driver, outputting paper pick-up commands (1st
Start and 2nd Start) at the appropriate timing to the peper feeder driver via the serial line.
The paper feeder driver drives the solenoid and motor according to these commands. Figure 2-
53 shows the flow of signals between the feeder and the printer. The paper feeder is supplied
with +24 VLX from the printer.
Paper feeder driver Pick-up motor dwer DC controller (printer)

(pmlter)
Paper feeder
-.-._
1
_-.-.- .___.__ _
pick-up motor
J852-1 ! [
,
4 Motor ! !
1 driver
! I
Paper leeder
B G
! i
pick-up roller
clutch solenoid I I
-24VA L
r!
1601-l
_ _ _ JZOl-1
_ _ _
I
!STD
1851-l J135-1 J603-1 +24VA
T3
PS851
-2 -2 -2 ZNDO
P 1601-2 JZOl-2 SLOl OUTPUT SERIAL LINE 1
i- i
$.....U, 2NDI .3, -3 SLll INPUTSERIALLINE 1
Paper feeder -4 -4 -4 GND +24VA
paper sensor
& -12 -12 4 f
SW851
! !
! !
Paper feeder SW852
! !
!
cassette size
sensing switches !
I !
i I
i i.
2-60

CHAPTER 2
B. Pick-up/Feed System C. Paper Jam Detection

The paper feeder pick-up motor [M3) is a Paper jam during pick-up or feeding from
stepping motor that rotates foward or the paper feeder is detected in the same
backward and is controlled by the paper way as for printer paper jam detection.
feeder driver PCB. See page 2-33 for details.
When the paper feeder driver PCB
receives a 1st Start command from the DC
controller, it energize the paper feeder pick-
up roller clutch solenoid (X851) for 0.25
seconds. then after 0.1 seconds, runs the
motor forward for about 1.4 seconds.
The pick-up roller runs through one
turn, and the feed roller is turned at high
speed. The motor is then run backward for
about 1.2 seconds to turn the feed roller,
and paper is fed into the printer.
The paper is fed by the oblique rollers so
that its end touches the left side plate to
correct skew. The paper stops when it
reaches the regist paper sensor (PSSOZ).
When il receives a 2nd Start command,
the paper feeder driver PCB runs the motor
backward for about 2.8 seconds to feed the
paper again.
FigUrc 2-64
2-61

CHAPTER 3
THE MECHANICAL SYSTEM
This chapter describes mechanical operation as well as disassembly and reassembly procedures of
Ihe printer. Note the following precautions during disassembly or reassembly.
1. When you remove the EF-l? cartridge, cover the cartridge with a cloth or put it in a dark
place to prevent light from affecting the drum inside the cartridge.
2. Remove the EP-E cartridge from the printer before disassembling or transporting the
printer.
3. ACAUTION: Before servicing the printer, disconnect its power cord from the electrical
outlet.
4. Assembly is the reverse of disassembly unless otherwise specified.
5. Note the lengths. diameters. and locations of screws as you remove them. When reassembling
the printer, be sure to use them in their original locations.
6. Do not operate the printer with any parts removed.
I. EXTERNAL5 . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 VI. FIXING SYSTEM.. ................... 3-14

II. DRIVE SYSTEM . . . . . . . . . . . . . . . . . . . . . . 3-6 VIL ELECTRONIC COMPONENTS.. 3-18
III. PAPER TRANSPORT SYSTEM.. 3-7 VIII. ENVELOPE FEEDER ............... 3-24
IV. EXPOSURE SYSTEM . . . . . . . . . . . . . . . 3-11 IX. PAPER FEEDER.. .................... 3-28
V. ELECTROSTATIC IMAGING/
DEVELOPING/CLEANING
SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12

CHAPTER 3
1. Right cover
1) Open the printer.
A. Covers and Panels 2) Remove the screw. then move the right
cover in holding the rear side of the
cover, and remove it.
(11 I_& c”“er ‘4) Kight cover

(2) Upper rover unit (5) Control panel unit
6 Front rover 6 Screw 0 Right cover
(3) Delivery cover
Figure 3-1 pigure 3-2
When cleaning inside the printer, or inspecting

or repairing il. remove the appropriate covers
and/or panels as described below.
3-1

CHAPTER 3
2. Upper cover unit 4) Kelease the hook holding the upper

1 I Remove the right cover. cover with a flat-blade screwdriver and
2) Open the delivery cover. remove the upper cover unit.
Figure 3-3
Figure 3-5
31 fbmove the three XTews.

3. Left cover
1) Open the multi-purpose tray.
21 Remove the right cover. and then the
upper cover unit.
Release the left cover hook holding the
left side plate, then open the left cover
to the front and remove it.
Figure 3-4
Nygure 3-6
3-2

CHAPTER 3
4. Delivery cover 5. Multi-purpose tray

1) Kemow I he c-asscttr. 1) Remove the cassette.
2) Open thr deliwry cover. 2) Remove the upper cover unit.
3) Kemovc thr hing? from the I/O panel. 3) Remove the right cover. and then the
4) Kernove the delivery rover by pushing left cover.
both its ends so lhe cover flexes. 4 1 Remove the control panel unit.
5) Open the multi-purpose tray.
6) Pull the side of the front cover slightly
outward, and l-C=IllO”~ the mulli-
purpose tray from the front rover.
Figure 3-7 (1) Front cover 0 Multi-purpose tray
Figure 3-8
7) Remove the lwo screws and then the

slay.
0 Screws CZ Stay
Figure 3-9
3-3

CHAPTER 3
8) Press both ends of the front cover and B. Exhaust Fan

remove the front cover. 1. Exhaust fan
11 Remove the right cover, and lhen the
upper cover unit.
21 Perform step 1 to 5 on page 3-18, and
remove the video controller unit.
31 Remove the fan cover hook, and then
fan cover.
4) Disconnect the connector and remove
the exhaust fan.
Figure 3-10
9) Pull the multi-purpose tray down and

out
0 Fan cover 0 Connector
0 Exhaust fan
Figure 3-12
Note on reassembly
When installing the exhaust fan. attach the
fan cover hook to the fan.
(iI Multi-purpose tray
Figure 3- 11
3-4

CHAPTER 3
C. Control Panel Unit 2. Disassembly and reassembly

1. Removing the control panel unit 1) Remove the two screws, and then the
from the printer control panel.
1 I Remove the urmer
a
cover unit.
I
2) Kemove the two screws.
(Ij screws a Control panel
0 Screws
Figure 3-15
Figure 3-13
3) Release the two hooks holding the

control panel unit.
41 Disconnect the connector from the
control panel, and remove the control
panel.
0 Hooks 0 Connector
0 Control panel unit
Figure 3-14
3-5

B. Main Motor
1. Removing the main motor from the
A. Drive Unit printer
1. Removing the drive unit from the 1) Remove the right cover.
printer 2) Perform sieps 1 to 5 on page 3-18, and
I) kfOrm steps 1 and 2 on page 3-14. remove the video controller unit.
and rr~l~ove Lhr fixing unit. 31 Disconnect the connector. remove lhe
2) Krmovr Ihc main motor by performing four screws, and remove the main
slcps I to 3 on this page. motor.
0: Connertor
(3 Main motor
Figure 3-17
Figure 3- 16
3-6

CHAPTER 3
8) &move the two screws, disconnect the

two connectors, and pull the paper
pick-up unit forward and out.
Paper Pick-up Unit
Removing the paper pick-up unit
&IWJV~ the cassette.
Kcrnc~ve lhr inner cover.
Kemovr the upper rover unit.
Kernwe I he leli cover.
Kemovc the multi-purpose tray.
Kemovr I hr control panel unil.
Kemavc the three screws from the left
side trl LhP prinler.
(1) Srrews 2 Connertors

(31 Paper pick-up unit
Figure 3-19
Note: If’ you replace the paper pick-up

unit. make several test prints and
cherk the leading edge registration
is 2.0 mm. II it is not, adjust il.
(See page 6-9)
Figure 3-18
2. Disassembly and reassembly
a. Pick-up motor
1) Disconnect the connector, remove the
two screws. and rem”ve the pick-up
motor.
0 Connector (Z Screws
0 Pick-up motor
Figure 3-20
3-7

b. Regist Paper Sensor and Cassette 3) Remove the pin in the projection on the
Paper Sensor left end of the regist sensor holder and
I) Kemove the cassette pick-up roller. push the projection.
2) Disconnect the connector. Then, take off two claws on the right
side, and slide off the regisl sensor
holder unit lo the left.
Slide the left end of the regist sensor
holder toward the cassette feed roller
shaft (front in the figure) so that it does
not touch lhe oblique roller.
Figure 3-21
0 Projection 0 Claws
(3 Regist sensor holder unit
Figure 3-22
4) Remove the sensors from regist sensor

holder unit.
@ Regist paper sensor

0 Cassette paper sensor
F-&we 3-23
3-8

B. Cassette Pick-up Roller C. Multi-purpose Tray Pick-up Roller
1. Removing the cassette pick-up roller 1. Removing the multi-purpose tray
I) ficrllovc IllP ~asselfe. I) Open the multi-purpose tray.
2) SlantI Ihr printrr on its right side. 2) Kenmve the inner cover.
3) 1’1111 orlt lhr casse(lr pick-up roller by 31 Push the sub-pad, hold the knob of the
ils knob. multi-purpose tray pick-up roller. and
pull out thr roller.
:I, Sub-pad
3 Mulii-purpos? lray pick-up roller
Figure 3-25
3-9
CHAPTER 3
D. Separation Pad Paper Delivery Unit

1. Removing the separation pad Removing the paper delivery unit
11 Opc‘n lhr multi-purpose tray. Remove the upper cover unit.
2) Hernovc the inner rover. Remove the left cover.
3) Kemovc thr multi-purpose tray pick-up Remove the leaf spring.
roller.
4) Rm~ove the separation pad with a flat-
hladr screwdriver.
II Leaf spring
(1) Separation pad Figure 3-27
Figure 3-26 41 Release the two hooks holding the

delivery unit, and remove the delivery
unit by pulling it forward.
m Paper delivery unit
Figure 3-28
3-10

CHAPTER 3
Note: When removing the cable lrom the

A. Laser/Scanner Unit laser PCB, support the PCB with
1. Configuration your hand. ‘Ihe PCB can be broken
7‘1~ laser/scanmr unit sweeps a laser easily it flexed.
hram across the photosensitive drum. It is
wn[i#~retl as shown below. 3) Remove the four screws and then the
laser/scanner unit.
) 2 ‘3
cD Screws 0 Laser/scanner unit
Figure 3-29 Figure 3-31
2. Removing the laser/scanner unit Notes: 1. Never disassemble the laser/

1) I’erl‘orm skp 1 and 4 on page 3-10. scanner unit; it cannot be adjust-
and wmwr Lhr paper delivery unit. ed in the field.
2) Disconrrcct thr three connectors and 2. When installing the laser/scan-
rcmtrvc lhc wire harness from the ner unit, engage the laser shutter
lasel-/scanner unit. with the shutter arm.
3. II’ you replace the laser/scanner
unit, make several test prints
and check the leading edge
registration is 2.0 mm. If it is
nol, adjust it.(See page 6-9)
ilj Connectors Q Wire harness
Figure 3-30
3-11

CHAPTER 3
A. EP-E Cartridge
1. Configuration
‘II? El’-I? rartridgc combines a photosensitive drum primary charging roller, developing unit,
and drum clraning unit in a single housing. During printing the drum rotates and an invisible
rlcctrostatic latent image is formed on its surfaw and then developed into a visible image by
Loner-.
The EWE carlridgr ~mnot be disasscmblrd.
(1‘1 Primary charging roller a Developing unit

6) Protective shield 8 Photosensitive drum a Drum cleaning unit
Figure 3-32
a. Protective shield
The photosensitive drum is protected by a protective shield that prevents exposure to strong
light. If the drum is exposed to strong light. blank areas or black streaks may appear on prints,
so do not open the protective shield unless necessary. (The protective shield is automatically
opened when the EP-E cartridge is inserted into the printer.)
3-12

CHAPTER 3
2. Cleaning the photosensitive drum B. Transfer Charging Roller

1) Oprn Ihr prinler a n d r e m o v e t h e 11 Open the printer.
cartridge. 21 Hook the left side of the transfer
2) Open lhr prot rctive shield. charging roller shaft with the supplied
31 Lihrrally sprinkle t o n e r on a pirre o f green cleaning brush. and remove the
Ilam~cl or other soft clolh and clean the Iran&r charging roller.
drum sr~rfacc with it.
Notes: 1. Only 111r1n thr drum in Ihe

dirwtion that it turns during
prin(ing. I[ y o u t u r n i t hark-
ward. the spring-loaded contact
thai conducts the developing
bias to the msidc rim of the
developing rylindcl- will be bent.
110 not touch the photosensitive
part of the drum while rotating
the drum.
2. Use flannel or some other soft 0) Transfer charging roller
cloth to clean the drum surface.
Do n o t use lint-free paper
because it is too hard and will Figure 3-33
scratch the surface. Never use
the solvents to clean the drum.
3. Finish cleaning as quickly as Notes: 1. Use dry lint-free paper (produc-
possible lo avoid exposing the ing little paper dust) to clean the
drum to light for a long time, transfer charging roller. Never
as this can cause abnormal use solvents.
images. 2. If paper dust or toner cannot he
removed from the transfer roller
with the lint-free paper, or if the
roller is deformed, change the
roller for a new one.
3-13

CHAPTER 3
2. Removing the fixing roller

1) Open the delivery cover.
A. Fixing Unit 2) Remove the two screws, lift the fixing
1. Configuration unit slightly. and pull it forward and
The fixing unit fries the toner image onto out.
the paper. I1 is configured as shown below,
3 Screws C2 Fixing unit
Figure 3-35
Note: When you replaced the fixing unit,

9) Separation guide @ Upper fixing roller push the metal levers on both
:3 Thermistor w Fixing roller heater sides of the new king unit down.
(5) Thermoswitch
6 Fixing unit entrance guide
(7% Lower fixing roller
Figure 3-34
3-14

CHAPTER 3
3. Disassembly and reassembly 3) Remove the two screws. disconnect the

a. Fixing roller heater connector, and remove the left futing
I) liel~~~s~ the two hooks holding the cover.
contact cover. and remove the contact
(‘ovw.
:I) Screws (3 Connector

(3) Left fixing cover
Figure 3-38
Figure 3-36
4) Remove the screw and then the fixing

2) Releas? the seven hooks holding the roller heater lead from the heater wire
wire rover to thr lixing unit with a Ilat- l?O”tT.
bladr screwdriver. Remove the wire 5) Remove the fixing roller heater lead
C”“m-. from the connector.
0 Wire cover 0 Screw 0 Connector

0 Lead
Figure 3-37
pigure 3-39
3-15

CfL4FTER 3
6) Rcmovr the Iwo srrews and then the b. Thermoswitch

righi fixing covc~. Pull the fixing roller 11 Kemove the wire cover.
heater carc~fully out of the upper roller. 2) Remove the two screws. Release the
hook holding the thermoswitch, and
remove the 1 hermoswitrh unit,
(1) Screws (2 Hook

0 Thermoswitch unil
Figure 3-41
Note on reassembly:
When installing the thermoswitch unit,
make sure that the sensing surface of the
thermoswitch contacts the surface of the
upper fiing roller uniformly. If it does not,
check whether the leaf spring is bent.
3-16

CHAPTER 3
5) Remove the screw and then the

thermistor.
Figure 3-44
821 Ilcater wire cover
Note for reassembly:

Figure 3-42 When installing the thermistor, make sure
that the sensing surface of the thermistor
contacts the surface of the upper fixing
4) Remove the two springs and open the roller uniformly. If it does not, check
lower separation quide. whether the leaf spring is bent.
Release the hook holding the upper
lixing frame with a flat-blade screwdriver
and remove lhe upp?r fixing frame.
0 Springs 0 Upper futing frame
Figure 3-43
3-17

CHAPTER 3
4) Remove the three screws and then the

connecter cover.
A. Video Controller Unit

1) Kcmove the right cover.
2) Remove the screw. and “pen the cover.
b
0) Screws @ Connector cover
Figure 3-47
(1: Screw 2: Cover
5) Remove the four screws and then the

Figure 3-45
3) Disconnect lhe connector.

(If an optional hard disk drive is
installed. lwo connectors should be
0 Screws Q Video controller unit
Ngure 3-48
m Connector (To control panel)

(F9 Connector (To hard disk drive)
Ngure 3-46
3-18

CHiUTER 3
B. Video Controller PCB 5) Disconnect the connector. (If an optional

I) Kanove lhr right cover. hard disk drive is installed. lwo
2) Rcrnovr ihe four screws and then the connectors should be disconnected.)
shield case. Then, remove the four screws and video
controller PCB.
3) Screws (2‘ Shield case

0 Expansion ROM PCB
@ RAM SIMMs
Figure 3-49 :31 Connectors
(4: screws
G Video controller PCB
3) II’ an expansion ROM PCB is installed.
the PCB should be rcmovcd
41 IT the RAM SIMM is installed. the SIMM Figure 3-50
should be removed.
Note for assembly

If you removed the expansion ROM PCB or
RAM SIMM when you replaced the video
controller PCB. reinstall it on the new video
controller PCB.
3-19

CHAPTER 3
C. DC Controller PCB 4) IWease the two hooks securing the DC

1) I’crlbrm slcps 1 a n d 5 o n p a g e 3-18, controller PCB to the PCB holder, and
and rcmovc lhc video controller unit. remove the DC controller PCB.
21 Disconnrc~l the c o n n e c t o r h-on1 the
(0 Connwtors
(21 DC controller PCB
Figure 3-52
Figure 3-51
Note on reassembly:
3) IXsronrmtthe e i g h t c o n n e c t o r s f r o m When installing the DC controller PCB, put
the DC controller PCB. the bottom of the PCB into lhe PCB holder,
then align the PCB with the positioning pin.
Note: When you replace Ihe DC cont-

roller PCB, make sure you adjust the
leading edge registration. (See page 6-
9)
3-20

CHAPTER 3
E. Sensor PCB
I) Remove the pick-up motor driver PCH
by performing steps 1 and 2 on this
page.
2) Disconnect the three ronrvxAors.
Figure 3-54
Figure 3-53 3) Kdease lhe three hooks, and remove

thr cover.
0 Hooks 0 Cover
Figure 3-56
3-21

CHAPTER 3
Power Supply
&move 1 he right cover.
Remove the three screws and then the
connertor cover.
Figure 3-56 iI 1 Screws c2 Connector cover
Figure 3-57
3) Remove the two screws. disconnect the

t w o ronnectors. remcwe the rod, and
pull the dower supplv forward and out.
Q screws 2 Connectors
(3 Rod @ Power supply
Figure 3-58
3 - 22

CHAPTER 3
G. High-voltage Power Supply PCB

I) l?rmovc (hr cassellr.
2) Stand the prinler on its right side.
3) Iiernow Ihr two screw. release the Iwo
hooks, a n d remove the high-voltage
c’as?.
Ihe
the
0) High-voltage power supply PCB
Figure 3-60
3 - 23

Figure 3-62
Figure 3-6 1 c. Bottom cover

1) Kemnve the right cover and lel’t cover.
2) Remove the rour screws and remove the
bottom cover.
Q Screw 0 Bottom cover
Figure 3-63
3 - 24

CHAPTER 3
2. Removing the envelope feeder pick- 2. Removing the envelope feeder drive
up motor PCB
11 Remove lhe t-t&l, lefl. and bottom rovers. 1) Remove the right. left, and bottom covers.
2) Disconnect the connector. 2) Disconnect Ihe two connectors and
remove the screw.
‘0
, Conncrlor
0 Connectors Q Screw
Figure 3-64
Figure 3-66
31 Kemow lhe two screws and remove the

pick-up motor. 3) Remove the sensor lever, then remove
the envelope feeder driver PCB.
m
(0 Screws Q Pick-up motor

0 Sensor lever
0 Envelope feeder driver PCB
EIgure 3-65
Figure 3-67
3 - 25

CHAPTER 3
4. Removing the envelope feeder pick- 5. Removing the lower separation

up roller roller, upper separation roller, and
1) &move the right, 1eA. and bottom covers. torque limiter
2) Remove the two E-rings and two 1) Remove the right, left, and bottom covers.
bushings. then remove the pick-up roller. 2) Remove the screw holding the ground
wire. Release the right and left snaps
with a flat-blade screwdriver, then
remove the upper cover.
0) E-rings ‘2: Bushings

@ Pick-up rollers
Figure 3-68
Figure 3-69
3) Kemow Ihe gear from the pick-up roller
shaft. Release the pick-up mller hooks
holding the shaft and remove the pick- 3) Remove the two E-rings and two bushings,
up rollers. then remove the lower separation roller
shaft.
Remove the lower separation roller from
the shaft.
0 E-rings D Bushings
@ Lower separation roller
Figure 3-70
3-26

CHAl’l-ER 3
4) Remove the separation roller shalt from

the guide. &move the upper separation Note 3: When assembling, check the
roller and torque limiter h-cm the shaft. separation roller pressure
spring has been installed
correctly.
01 Guide
(2, Upper separalion roller
‘3) Torque limiter 0 Separation roller pressure spring
Figure 3-71 Figure 3-73
Note 1: Remove the s e p a r a t i o n g u i d e

and the upper cover as a u n i t .
If the separation guide must be
removed separately. adjust the
posilion 01 thr g u i d e a f t e r
reinslallalion. (See page 6-8).
2: When assembling install the
oldham joint as shown below.
3 - 27
CHAPTER 3
4) Remove the two screws and then remove

drive unit.
1. Removing the drive unit

1) Release the two claws, and remove the
ZZ Connectors 0 Cable tie

@ Screws @ Drive unit
0 Claws G) Front rover Figure 3-76
Figure 3-74
2) Remove the screw, release the two claws,

and open the PCB cover.
0 Screw 0 Claws
0 PCB cover
Figure 3-76
3) Disconnect the two connectors and

remove the cable tie.
3 - 28

CWAFTER 3
2. Removing the paper feeder pick-up Removing the paper feeder driver
motor PCB
1) Kemove the drive unit. Remove the screw. release the two
2) Remove the four screws, the E-ring, the claws, and open lhe PCB cover. [See
gear, and remove the plate. Fig. 3-75.)
Disconnect the three connectors and
remove the cable tie.
Release the claw holding the PCB, then
lift the paper feeder driver PCB.
Screws
Cl) @> E-ring
a Gear (4) Plate
Figure 5-77 0 Claw

@I Paper feeder driver PCB
3) Remove the Iwo screws and remove the

pick-up motor. Figure 3-79
4. Removing the paper feeder pick-up

roller
I] Pull out the pick-up roller by its knob.
@ Screws QI Pick-up motor
figure 3-78
0 Pick-up roller
Figure 3-80
3 - 29

CHAPTER 4
INST&LATION
This printer was carefully adjusted and strictly inspected before being packed. This makes
..
sure that it works as intended, it must be installed correctly. The service engineer must choose
a suitable location, install the printer according to the proper procedures, then fully check the
printer before It Is used. The requires a thorough understanding of the printer.
II
I. CHOOSING A LOCATION. . . . . . . , . 4 1 III. STORAGE AND HANDLING GF

II. UNPACKING AND CARTRIDGES . . . . . . . . . . . . . . . . . . . . . . . . . 4 6
MSTALLATION . . . . . . . . . . . . . . . . . . . . . . . 4-2

CHAPTER 4
Do not install the printer in these places:

. In the sun
Make sure the requirements below are met If the printer must go somewhere sunny,
when installing the printer. The service the windows must have curtains keep to
engineer should inspect the place lhe the sun off.
. Near magnets or equipment that produces
printer will go before delivery.
a magnetic field
1. Power supply . Where there is vibration
. Where it is dusty
l Line vollage: No more than 2 10% outside
the rated voltage . Near flames or water
l Line frequency: SO/60 + 2 Hz
J. Installation apace
2. Operatinn conditions There must be an enough space around the
Flat level. supporting surface printer to operate it. (See Figure 4-l) The
Ambient temperature of 10 lo 325°C printer must go on a desk or other level
Humidity of 20 to 80% KH surface large enough to accommodate its
No condensation feet (and those of the paper feeder, if
Good ventilation used) and sturdy enough lo carry its
weight .
Figure 4-l
4-l

CILWTER 4
: ‘D BIPk3u3~%~Yt 01
)ImuamKdh A A
If the boxed prinler is brought into the warm from a cold storeroom or delivery truck, condense-
lion will form on the printer surfaces. This will cause various problems, such as print defects. To
stop this happening, make sure you leave the printer in its box to gradually warm up to room
temperature before unpacking it. This will take al least an hour.
1. Unpacking
r I
teP ACliOIl Check Remarks
1 / Open the box.
2 [ Take all the ancillary parts and Check you have the following:
the documentation out. l Power cord
l Manual
l Cartridge
Lift off the Styrofoam pads (right

! and left), then lift the printer
i out.
4 Take the printer out of its plastic

bag. Peel off the tape holding the
vartous components.
5 Take the cassette out and remove
) tie lifting plate retainer from the
cassette.
6 Open the printer and remove i See Figure 4-2.
the tape and the spacer
inside the printer.
7 Remove the packing material
holding the transfer charging
roller.
8 Open the multi-purpose tray
and remove the protective
sheet.
9 ’ Open the delivery cover and
remove the sheet and the spacer.
Push the metal levers on both
sides of the Axing unit down.
Figure 4-2
4-2

CHAPTERS
Cartridge box
Lower Styrofoam pad

Lower Styrofoam pad ,
Spacer
’ Protective sheet
4-3

CHAPTER 4
2. Unpacking and installing the cartridge
trp Action Check Remarks

1 1 Open the small box containing t, See F@re 4-4.
the cartridge and take the
cartridge out. Take the cartridge
out of its aluminum bag.
i
2 Hold the cartridge as shown in See Figure 4-6.
Fig. 4-6 and slowly rock it 45” ~
rach way. live or six times, to ~
distribute thr lonrr evenly.
4 Oprn the printer. hold the Slowly insert it until it is

rartridge in both hands, and securely seated at each
install it in the printer.
/
5 Close the printer.
Figure 4-4
4-4

CHAPTER 4
3. Operation check
tep Action Check Remarks
I Load lhr upper cassette with

paper.
1
2 Plug the power cord in and Check lhat the density of the
stitch the printer ON. When the test print is right.
READY indlratnr slops Ilashing,
the printrr is standing by: Press
Ihr ON LINE key to put the
printer off lirw. then press the
TEST/FONT key to run ofT a test
print. ~
3 , For safety. keep the area around
the @nter clear. I
4-5

CHAPTER 4
B. Storage of Unsealed Cartridges

Each cartridge contains a photosensitive
drum coated with an organic photocon-
A cartridge is affected by its storage ductor (OPC) t h a t d e t e r i o r a t e s w h e n
conditions even if it is sealed in its box, so exposed to strong light. The cartridge also
its life depends on how it is used or stored. contains toner. This makes cartridges
Store and handle cartridges carefully. delicate item. so lell the customer all about
correct storage and handling of cartridges.
A. Storage of Sealed Cartridges
When storing cartridges in a warehouse or 1. Storage requirements after unsealing
workshop. rnainiain the conditions given in 1) Store the cartridge in its aluminum
Table 4 I. Notr thr following: bag.
Keep cartridges oul of the sun. 2) Avoid places in the sun or near
windows. Do not leave a cartridge in a car
Do not stow cartridges on a surface for a long time, as the inside of the car
that vibralcs. can get extremeiy hot. Even if the cartridge
is in its box. do not put the box in the
Do not knock or drop cartridge boxes. sun or leave it in a car for a long time.
31 Avoid places that get too hot, too cold,

Table 4-1 Storage conditions or too humid. Also avoid places where the
temperature can change suddenly.
4) Avoid places exposed to harmful gases

(insecticide, etc.) or salty air.
5) Store cartridges in the temperature

range 0 to 35°C.
6) Keep cartridges away from computer

workstation, disk drives, and floppy
disks.
7) Keep cartridges out of reach ol children.
2. Cartridge life
The useful service life of a cartridge is two
and a half years from the date of
manufacture (printed on the cartridge). The
expiry date (date of manufacture plus two
and a half years) is given on the cartridge
box and the shipping box. A cartridge used
Note: “Total storage time” in the Table after the expiry date will produce prints of
means the cartridge validity period reduced quality, so cartridges should be
from the date of manufacture. This used within their service lives.
is part of the cartridge validity data
information shown on the cartridge
packing.
4-6

CHAPTER 4
C. Handling Suggestions
1) Before installing a new cartridge in the
printer (or if blank spots appear on
prints during use, because of uneven toner
distribution) hold the carbidge horimntally
and slowly rock it 45” each way about the
drum axis. five or six times. as shown in
Figure 4-6. This will distribute the
toner evenly. Then install the cartridge
in the printer. Using any other method
may result in toner leaking from the
developing unit or &zaning unit.
Figure 4-5
After installing a new cartridge. print

three to five test patterns to check for
toner leakage. Figure 4-6
2) Before moving the printer, take the 4) Since the photosensitive drum is
cartridge oui , and put it into an sensitive to light, never expose it to
aluminum bag or pack it with thick direct sunlight or strong light (1500 lux
cloth to prevent exposure to light. or more). If you do, blank spots or
black streaks may appear on prints.
3) Keep rartridges away from computer If this does happen, stop the printer for
workstation, disk drives, and floppy a while; this will usually solve the
disks. The magnet in the cartridge can problem. If the cartridge is exposed lo
corrupt the video data in the memory of strong light for a long time, blank spots
the workstation, or the data on disks. or black streaks may still appear on
prints even after stopping the printer.
51 Do not open the protective shield in the

bottom of the cartridge and touch the
surface of the photosensitive drum. If
the drum surface is dirty, clean it with
flannel or some other soft cloth liberally
sprinkled with toner, Do not use dry
cloth, lint-free paper, or solvents.
4-7

CNAPTER 4
6) Do not lurn a cartridge upside down or

stand it on end. Always lay it down
with its label up.
7) Never take a r&ridge apart
Note: If the photosensitive drum gets

expost-d to normal light of about
1500 lux for about 5 minutes. store
the rartridgr in a dark place to
rewvc~ Direct sunlighl is 10,000 to
30.000 lux. Exposing a drum to light
this bright will destroy il.
4-8

CHAPTER 5
MAINTENANCE AND SERVICING
I. PAPERS REPLACEMENT IV. LISTOFTOOLS . . . . . . . . . . . . . . . . . . . ..a 5-2

SCHEDULE . . . . . ..I..................... S-1 V. LIST OF LUBRICANTS,
IL EXPECTED SERVICE LIVES OF CLEANERS ..,...................,...... 6-4
CONSUMABLBS . . . . . . . . . . . . . . . . . . . . . . S-1 VI. SERVICE CEiECKPOINTS . . . ..I.. S-5
III. PERIODIC SERVICE VII. MAINTENANCE BY
SCHEDULE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-l CUSTOMER . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7

CHAPTER 5
The k~llowing is a lable of consumables which, over the warranty period of the printer, are
expecled to need replacement once or more because of deterioration or damage. The life of the
consumables is expressed in terms of the number of prints processed; replace them when they
prove to be faulty.
Table 5-l
As of January 1994
NO Parts nan,r Par18 No Qr‘Y Service life Remarks
1 Multi-purpox pick-up RBl-2127.000 2CQOOO sheets Replace the multi-purpose

I-Oiler pick-up roller and
2 Separation pad RF5~0343~000 2CKNOO sheets separation pad together.
3 Fixing unit RG5-0454.130 2IXK00 sheets 100-l 15v

RG5-0455 130 200.C00 she& 220-240V
RF5-0349.000 1 1 200.000 sheets
R131-2126.000 1 200,000 sheets
R117-I 143.000 1 25,000 hours
Note: The values above are estimates only and subject to change based on future data.
None
5-1

CHAPTER 5
A. Standard Tools
The standard tools required for servicing the printer are listed below
Table 5-2
go. Tool name Tool No. Remarks

L i Tool case TKN-000 1
2 Jumper wire TKN-Ob69 With clips. E-Z hook
3 ~ Tbirkness gauge CK-0057 0.02 mm to 0.3 mm
4 ~Compression spring scale CK-0058 For checking cassette spring

strength (O-600 g]
’ CK-0101 M4. M5
z I ;;;:;‘d:;;z:lb;; CK-0104 M3, M4
7 Phillips screwdriver CK-0105 M4, M5
8 Phillips srrcwdriver CK-0106 M4, M5
9 Flat-blade screwdriver CK-01 I1
10 Precision flat-blade scvsvdriver seL 1 CK-0114
11 Allen wrench set CK-0151
12 File, finr CK-0161
13 Allrn (hex) srrrwdriwr ~ CK-0170 M4
14 ~ Diagonal cutling pliers CK-020 1
15 ~ Nerdlr-rmsr pliers CK-0202
16 mrrs CK-0203 Slip-joint
17 Relaining nng pliers CK-0205 , For external rings. 19-30 mm
1N crimprr CK-0218
19 Twrcecrs CK-0302
20 , Kulrr 1 CK-0303 150mm

21 ~ Soldering iron ~C K - 0 3 0 9 1oov.3ow
22 ~ Mallrl, plastic head ~C K - 0 3 1 4

2 3 Brush CK-0315
24 Penlight CK-0327
25 Plastic boltlr CK-0328 IOOCC

CK-0329 01.5 (mm) x 1 (m)
!; ~ E[oi;f;fp;;k CK-0330 I.5 mm
CK-0336 500 SH/PKG
29 Soldering iron CK-0348 240 V, 30 W
3 0 Oiler CK-0349 3occ
3 1 Plastic jar CK-0351 3occ
32 , Digital mulllmeter CK-0552 ’
5-2

CHAPTER 5
B. Special Tools
In addition lo Ihe standard tools, the following special tools arc required for servicing the
printer.
Table 5-3
io. To01 name Tool No. Shape RANK Application/remarks

1 Printer driver D Used for checking the
trstw operation of the printer or
checking a failure of Ihe lam
diode.
2 Thickness gauge RYY-0088 -2 1 A 1 Used for installing the

i c-e separation guide.
I -1
3 Thicknessgauge 1 QY9-0001
Note: Ranks
A: Each service technician should carry one with him
B: A group of the service technicians should share one.
C: Each workshop should keep one.
5-3

CHAPTER 5
Table 5-4
“. Material name Components Use Remarks
I Alcohol: ethyl CZH50H. Cleaning: plastic, l Purchase locally

(pure or (CH&CHOH rubber, external parts l Flammable: keep away
denatured) or from flame
isopropyl [pure
or denatured)
d MEK (methyl CH,CO-C,II, Cleaning: oil and l Purchase locally
rthyl ketone) toner stains l Highly flammable: keep
i
away from flame
3 1Luhrirating oil i IS0 VG 68 oil, ESSO Apply between gear l Tool No. CK-0451
Febis K68. MOBIL and shaft (500 g can)
Vactra oil No. 2. SHELL l Equivalent oil may be
Tonna oil 1‘68 used
~ . Never apply to the
molding or the gear at
the molding because it
has a bad effect on the
molding.
4 Lubricating ~Special metallic 1
soap A p p l y to gear . Tool No. CK-0551
material i Silicon oil Can he applied to the (20 g tube)
molding
5-4

CHAPTER 5
A. Printer
Cartridge
Point Tool/solvent Remarks

Photosensi- Toner Never clean the drum wth
solvents.
Do not touch or clean the drum
unlessabsolutely necessary.
Do not expose the drum to light.
Fixing unit
Point ~Tool/solvent ~ Remarks

separation MEK
guide
Entry guide MEK
Transfer guide
Remarks ‘\\,_/’
Clean.
1 guide Multi-purpose tray pick-up roller
Point Tool/solvent 1 Remarks

Multi- Damp cloth or Clean.
Static charge eliminator
Point ~Tool/solvent Remarks

-
static Cleaning brush Clean.
charge \
eliminator
\ Separation pad
Point ~Tool/solvent Remarks
Transfer charging roller Separation 1Dry cloth I CL7

pad
Point Tool/solvent Remarks
Transfer Lint-free paper Clean the roller only if it is very
Cassette pick-up roller
charging dirty. Do not touch the roller
roller and try not Lo have any Point Tool/solvent Remarks I
solvents or 011 on your hands t--m
when cleaning. Cassette Damp cloth or Clean.
Never usr water or solvents for pick-up alcohol I
CkZUGIltI roller
Figure 5-1
5-5

CHAPTER 5
The customer should do the following maintenance to maximize printer performance.
Table 5-5
Item Customer maintenance
Cartridge Rock the cartridge to redistribute toner. If necessary r&w it.

Static charge When replacing the cartridge. clean the static charge eliminator
rliminator with the green cleaning brush in the printer.
Transfer guide When replacing the rartndge. clean the transfer guide area wit1
area the soft dry cloth.
5-7

CHAPTER 6
TROUBLESHOOTING
I. INTRODUCTION.. . . . ,. . . . . . . . . . . . . . . . 6- 1 VI. PAPER TRANSPORT

II. EXPLANATION OF TROUBLRSHOOTING . . . . . . . . . . . . . . 6-42
SPECIAL TOOL . . . . . . . . . . . . ..I........ 6-4 VII. LOCATION OF ELECTRICAL
III. MEASUREMENT AND PARTS/FUNCTION . . . . . . . . . . . . . . . . . . 6-46
ADJUS-NT . . . . . . . . . . . . . . . . . . . . . . . . 6-7 VIII. VARIABLE RESISTOR6, LEDS,
IV. IMAGE DEFECTS . . . . . . . . . . . . . . . . . . . . 6-14 TEST PINS, JUMPERS, AND
V. TROUBLESHOOTING SWITCHES ON PC BOARDS..... 6-56
MALFUNCTIONS . . . . . . . . . . . . . . . . . . . . . 6-28

4. Other points
During winter, if the printer is brought into
A. Initial Check a warm room from a cold one [for instance,
1. Operating environment a warehouse), condensation will occur
Check that: inside the printer, causing various
a. The line voltage does no1 vary more problems.
than 10% from the voltage shown on
the rating plate. For example:
b. The printer is installed on the level. Condensation on optical surfaces (such
c. The room temperature is kept between as the scanning mirror and lenses] till
10 and 32.5”C. a n d t h e r e l a t i v e make the print image light.
humidity, between 20 and 80%. If the photosensitive drum is stored in
d. The printer is not exposed to ammonia a cold area, its electrical resistance will
gas and is not located anywhere hot or be high, making it impossible to obtain
humid (for instance, near a water correct print contrast.
faucet, boiler, or humidifier). near open
flames, or anywhere dusty. condensation occurs, w i p e t h e
e. The printer is not exposed to direct assemblies or parts with a dry cloth, or
sunlight. If it has to be put somewhere leave the printer ON for 10 to 20 minutes.
sunny. the window should be curtained. If an EP-E cartridge is unsealed shortly
f. The room is well ventilated. after being brought into a warm room from
a cold one. condensation will also occur
2. Print paper inside the cartridge: this may cause image
Check that: defects.
a. The recommended paper is being used. Be sure to inform the customer they
If the paper is loo thick or too thin, or must let the EP-E cartridge adjust to room
lends to curl. paper jams or transfer temperature before unsealing it. This will
problems may occur. or prints may be take an hour or two.
blurred.
b. The paper is not damp. Use new print
paper and check whether the print
quality improves.
3. Consumables
The message “16 TONER LOW” appears on
the Status indication display when an EP
E cartridge is installed in the printer. If the
message appears, the amount of toner is
insufficient; prepare a new cartridge. If blank
spots appear on prints, the toner is
unevenly distributed in the cartridge. Take
the cartridge out and slowly rock it from
side to side to distribute the toner evenly
as described in Section 111 of Chapter 4.
6-l

CHAPTER 6
B. Basic Procedure
If an image defect or a malfunction occurs.
perform the initial check, then follow the
basic procedure below.
1. I f t h e p r i n t e r m a l f u n c t i o n s . r e a d
section V on troubleshooting.
2. If an image defect occurs, determine
the type of image defect from the list of
image defect samples on page 6-14.
and correct the defect.
6-2

CHAPTER 6
C. How to use the Troubleshooting Tables

The lroubleshooting tables in this section have been created from general flowcharts. The way
of using 1 hese tables is described below, based on the following examples.
Example: No AC Power
P o s s i b l e rausc ~Step Check F leSUlt Prcocedure

4
Line voltage 1 Is the rorrert voltage present at the _ NO Advise the user that
outlet? I the correct line
voltage is not
available at the
outlet.
+
Power plug 2 Is the power cord securely plugged NO Push the power plugs
into the printer and the outlet? ! in firmly.
+ To find the possible causes (parts likely to be defective) of a particular fault, refer to the
item marked IPossible cause] in the table.
In the case of “No AC Power” in the above table, it is possible that the line voltage or power
plug is defective.
6 To repair or check the faull, follow the numbers in the “Step” column and answer the
questions in the “Check” column with YES or NO. If the answer agrees with that in the
“Result” column. follow the procedure given in the “Procedure” column. If this does not
corrected the problem, proceed to the next check.
<step> <Chcrk> <Kesult> <Procedure>
2 Push the Power plugs in firmly.
6-3

CHAPTER 6
2. Description of control panel
A. Printer Driver Tester
Figure 6-2
TEST PRINT
Permits the printer to print the pattern
Figure 6-l
specified by VIDEO SELECT.
1. Outline VIDEO SELECT

The printer driver tester allows lhe printer Selects the test pattern to be printed:
to operate without being connected to an black hnage, vertical lines, horizontal lines,
interface to determine whether the printer or a white image.
is operating normally.
The tester has the following two functions: PAPER FEED METHOD SELECT
Picks up the paper or the envelope from
a. It permits the printer Lo print a black one of the following:
image. horizontal or vertical lines. or a l Upper cassette
white image to being determine - Multi-purpose tray
whether the trouble is caused by the l Lower casselte (cassette feeder)
printer or by the video controller l Envelope feeder
(external device].
b. It operates the laser in the printer. READY CONTROL
Measure the output voltage [APCIN ON places the printer in a READY state
signal). which is proportional to the when the power is ON, even if one of the
intensity of the laser beam, with a following conditions is present (the READY
digital multimeter and confirm that the INHIBIT mode).
output voltage is within the stipulated l No cartridge
range. l No paper
l Paper jam
l EDerror
When turning the READY

CONTROL switch ON to set the
tester to the READY INHIBIT mode,
connect the tester to the printer
before turning ON the printer
switch. To cancel this mode,
disconnect the tester and then
turn the printer switch OFF/ON.
Connecting the tester with its
READY CONTROL switch ON to the
on-line printer causes the printer
to enter the READY INHIBIT mode,
6-4

CHAPTER 6
which continues even when the PAPER SIZE [LED)

tester is disconnected. Indicates the paper size of the cassette in
This mode continues until the the paper pick-up unit specified by the
printer is turned OFF. PAPER FEED METHOD SELECT switch.
Table 6-l
LASER POWER CHECK
Permits the laser diode to emit light.
Note: Do not set the LASER POWEK ---_

CHECK switch to ON while the No paper ON 1 ON / ON
printer is operating. otherwise lhe Executive OFF OFFI ON
bark OF the print paper will become B5 O N 1OFFi ON
dirty. ON 1 OFF OFI
Legal
A4 OFF ON
DENSITY SELECT 1 iON
Adjusts the image density. Letter i OFF1 ON OFI
U-CASS. (LED)
Lights when there is paper in the upper
cassette. LASER INTENSITY [LED)
Lights when the intensity of the laser beam
is insufficient.
MP TRAY (LED)
Lighls when there is paper on the mulli-
purpose tray. CARTRIDGE SENSOR (LED)
Lights when there is a cartridge in the
printer when the primary AC bias is
L&ASS. (LED]
output.
Lights when there is paper in the lower
cassette.
COMMUNICATION (LED)
ENVELOPE SENSOR (LED) Flashes twice a second when the tester
communicates with the printer.
Lights when there is an envelope in the
envelope feeder.
+24VA (LED)
REGIST SENSOR (LED] Lights when +24 VA is supplied to the
tester.
Lights when paper is at the regist paper
sensor.
MI’ TRAY END SENS. (LED)

Lights when paper is at the MP tray paper
end sensor.
DELIVERY SENSOR [LED)

Lights when paper is at the paper delivery
sensor.
TONER SENSOR (LED)

Lights when there is toner in the cartridge
when the primary AC bias is being output.
6-5

CHAPTER 6
3. List of signals
Table 6-2
Connertor contacl No. S i g n a l name Funclion
Jl-1 +24VA i +24VA

Jl-2 O U T Serial line (outputl
Jl-3 IN Serial line (input)
Jl-4 GND GND
4. Procedure
1) Sel the prinler power switch to OFF.
21 Altarh the tester connector to the connector (5135) for the paper feeder or the connector
(J 136) for the envelope feeder.
3) Set the printer power switch to ON.
4) When the printer goes into stand-by, operate the tester to perform the check.
Note: If your body is electrically charged when you operate the printer driver tester, printer
misoperation or malfunction may occur. So, be sure to touch a metal part of the printer
with your hand Lo discharge the static electricity on your body before operating the
tester.
6-6

CHAPTER 6
B. Mechanical Adjustment
1. Checking the nip width of the lower
fixing roller
A. Image Adjustment The fiing unit does not allow adjustment
If an image problem occurs, follow lhe of the pressure (nip width). If the nip width
procedure below to perform a test print. is set incorrectly, a fixing problem may
occur.
1)Press the ON LINE key to put the printer Follow the procedure below to check the
off line. nip width.
2) Press the TEST/FONT key: “01 TEST
PRINT A” appears on the Status 1) Either take along one or two A4/lelter-
indication display. Press the ENTER size all-black copies made on copier, or
key; the pattern shown in the figure make such a copy using a copier at the
below is printed. customer site.
21 Put the all-black copy on the multi-
purpose lray.
3 1 Press the TEST/FONT key.
4) When the leading edge of the print
emerges at the face-down tray, switch
the printer OFF. wait for about 10
seconds, then switch the printer ON
again.
5) Measure the width of the glossy band
across the print (Measure 15 mm from
the leading edge of the paper.), and
check that it meets the requirements
shown in the table below.
Feed-OUt
direction
Center of A4 ail-black
-
3) Determine the type of image problem

from the test print, then proceed to
Section IV.
Figure 6-4
Table 6-3
6-7

CIMFTER 6
2. Installing the separation guide

[Adjusting the gap between the
separation guide and the lower
separation roller)
Under normal conditions. remove the

separation guide along with the upper
cover. If you removed just the separation
guide or replaced a bent separation guide.
adjust the gap as follows.
Install the separation guide at the
p o s i t i o n 1.5mm a w a y f r o m t h e l o w e r
separation roller. Adjust its position by
inserting the thickness gauges (lmm and
0.5mm) i n t o t h e g a p b e t w e e n t h e
separation guide and the lower separation
guide.
cCross sectlonal view of the envelope feeder>
Separation guide
Thickness gauges
Thickness gauge
(0.5mm, ayg-ooo’) Lower semration rolle

CIiApTER 6
C. Electrical Adjustment
Leadingedgeofpaper
1. Leading edge re&tration adjustment
VR202 on The DC c&troller PCBhas been
adjusted at the factory. Therefore, it does
not require adjustment in the field during
installation. However, when the DC
controller PCB is replaced, the leading edge
registration must be readjusted by using
the following procedure. [If you replace the
paper pick-up unit or the laser/scanner
unit. make several Lest prints and check
the leading edge registration is 2.0 mm. If
it is not, ad&s1 it.)
1) Perform steps 1 and 4 on page 3-20.
and replace the DC controller PCB.
2) Set VR202 PCB on the DC controller to
to, then place sheets in the cassette.
Press the TEST PRINT switch and
obtain several test prints. Figure 6-6
3) Measure the distance [a) from the
leading edge of each sheet to the
pattern. (See Figure 6-6) Take the
average of the measured distances.
4) Adjust VR202 so that the value Table 6-4
obtained in step 3 is 2.0 mm according
to Table 6-4. For example, if the
average value in step 3 is 2.6 mm, the
difference is 0.6 mm. Set VR202 to +2
m Correction VR202 Correcti
by turning it clockwise. (See the table

6-4 and figure 6-7.)
51 Obtain several prints again. Perform
step 3 again and confirm that the
leading edge registration is 2.0 mm. If
it is not. perform steps 2 to 5 again.
6-9

CHAPTER 6
J201
IWO2
IC201
TB201 J211 J210
L-l J212
Figure 6-7
6-10

CHAPTER 6
This page intentionally left blank
6-11

CHAPTER 6
+ Laser malfunction diagnosis flowchart

The laser beam is invisible. When a problem in the laser output occurs, use the laser diagnosis
flowchart to determine whether the malfunction was caused with the laser/scanner unit or the
DC controller PCB.
Notes for the flowchart

1. The following abbreviations are used in the flowchart.
a. Printer driver tester ) * + Driver tester
b. Digital multimeter l l + Meter
c. EI’-E cartridge * + + Cartridge
2. The printer driver tester switches marked with ‘x” can be set to any position.
3. The voltage must be measured three times, and the average taken.
Before usinz the flowchart

Set the &inter power switch to OFF and remove the cartridge.
Attach the driver tester connector to the envelope feeder connector (51361.
Set the driver tester switches as follows:

TEST PRINT . . . NOT ENAB
VIDEO SELECT . . _, . x
PAPER FEED METHOD SELECT x
READY CONTROL . . INIi
Check by using the flowchart on the next page.
6-12

CHAPTER 6
Switch the power ON. When the printer

is ready, set the LASER POWER CHECK
switch of the driver tester to “ON”.
<*y.
,
1 YES t
Set the meter range to 20 VDC. Contact the Set the meter range to 20 VDC. Contact the
test leads against the following test leads against the following
connector pins on the DC controller PCS: connector pins on the DC controller PCB:
f%?? r DC controller _M% DC controller

V-D J206-6 (APCOUT) V-D J206-5 (APCIN)
COM J206-7 (GND) COM 5206.7 (GND)
<Tp CHECK switch of the driver tester

Does the meter indicate 0.95 to
CHECK switch of the driver tester
1 YES
Switch the power OFF, and
laser/scanner unit. The laser/scanner unit is working normally.
+
Switch the power OFF, and replace the DC
End
:
Figure 6 - 8
6-13

CHAPTER 6
A. Examples of Image Defects
I-1 Light l-2 Dark l-3 Completely l-4 All black

blank
l-5 Large dots l-6 Dtrl on back 01 l-7 Vertical black l-8 Irregular and
vertically in streaks smudged vertical
m
Ill%? bands
E
EY
l-9 Irregular and smudged l-10 Blank spots l-11 Solid vertical
horizontal bands white lines
l-12 Faulty I-1 3 Poor fixing i-1 4 Distortion l-15 Missing BD

registration signal
Figure 6 - 9
6-14

CHAF’TER 6
B. Troubleshooting Image Defects
jr-111
Does the print quality improve when

the image density is adjusted?
the EP-E cartridge is replaced?
Open the printer while a print is being YES If the toner image is very
made. and open the drum protective ) faint, go to step 7.
shield of the EP-E cartridge. Is the
toner image on the drum being
transferred to the paper? [Do not open
the drum protective shield for more
than 10 seconds.)
‘rim paper 4 Does the print quality improve when YES Replace the ptint paper.
new paper is used? Advise the customer of the
proper method to store
paper.
r?ansfer 5 Does thr image become darker when YES Replace the roller.
:harging roller the transfer charging roller is
replaced?
High-vrrllagr 6 Perform a test print. About two YES Check the continuity
power supply seconds after the main motor starts. between the high-voltage
PCB (transrer does the voltage between J2 1 O-9 contact and the shaft of the
voltage) (X02) and 52 lo- 10 (GND) on the DC ~ transfer charging roller. If it
controller PCB become about 0.76 IS within the proper valve,
VDC? replace the high-voltage
power supply PCB.
DC cnntroller NO Replace the DC controller
PCB PCB.
6-15
CHAPTER 6
Possible cause Step Check Result Procedure

_._______.- -___
High-voltage 7 Perform a test print. About ftve seconds YES Check whether the high-
power supply after the main motor starts. does the voltage contact is making
PCB voltage between 5210-9 (SLQ2) and good contact with the
[Developing ~ J21D-10 (GND) on the DC controller developing bias contact of
blasl PCB become about 0.76 VDC? the cartridge. If it is. replarr
the high-voltage power
supply PCB. If the problem
persists after replacing the
PCB, check by using the
laser malfunction diagnosis
flowchart in Section III C.
DC controller
PCB PCB. If the problem perslste
after replacing the PCB.
check by using the laser
malfunction diagnosis
6-16
CHAPZ’ER 6
Does the print qualtty improve when
Clean the printer drum grounding

contact and cartridge contact, then
perform one test print. Does the print
Iigh-voltage 3 About one second after the main YES Check whether the hlgh-
lower supply motor starts. does the voltage between voltage contact is making
‘CB (Primary 5210.6 (HVRSV and 5210.10 (GND) good contact with the
ltgh voltage) on the DC controller PCB change from primary charging roller of
0 V to about 5 VDC’? the cartridge. If it is, replace
lhe high-voltage power
PCB. check by using the
’ laser malfunction diagnosis
flowchart in Section 111 C.
3c controller NO Replace the DC controller

PCB PCB. If the problem persists
1 after replaclng the PCB,
6-17

CHAPTER 6
I-3 Completely blank

._____
DC controller 1 About one second after the main NO Replace the DC controller
PCB motor starts. does the voltage between PCB.
J210-6 WRST) and 5210-10 (GNDJ
on the DC controller PCB change from
about 5 VDC to 0 V?
High-voltage 2 Perfrom a test print. About five YES Check whether the high-
power supply seconds after the main motor starts, voltage contact Is making
PCB does the voltage between 52 1 O-9 good contact with the
[Developing (SLO2) and 52 lo- 10 (GND) on the DC developing bias contact of
bias) controller PCB become about 0.76 the cartridge. If it is, replace
VDC? the high-voltage power
PCB, check by using the
--I .-; -~I
laser malfunction diagnosis
flowchart tn Section 111 C.
DC controller NO Replace the DC controller
PCB PCB. If the problem persist:
after replacing the PCB,
6-18

CHAPTER 6
I-4 All black
-
Possible cause 3tep Check esult Procedure
EP-E cartridge 1 Does the print quality improve when fES Replace the cartridge.
the cartrld@ is replaced?
c
High-voltage 2 Perform a test print. About one second YES Replace the high-voltage
power supply after the main motor starts. does the power supply PCB. If the
PCB (Primary voltage between 5210.9 (SLOZ) and problem persists after
voltage) 52 lo- 10 (GNDI on the DC controller replacing the PCB, check b,
PCB become about 0.76 VDC? using the laser malfunction
diagnosis flowchart In
section 111 c.
PCB PCB. If the problem penistz
after replaclng the PCB,
6-19

CHAPTER 6
I-5 Large dots vertically in line
Possible cause Step Check Procedure

Statir charge I Is the static charge eliminator dirty?
eltminator
2 Is the static charge eliminator
grounded?
Transfer 3 Is the transfer charging roller dirty? roller. If it is not
charging roller possible to clean Lt. replace
/ I-6 1 Dirt on hack of paper

Is the transfer charging roller dirty7 YES Clean the roller. If it cannot
be cleaned, replace It.
______~
Is the entrance guide dirty? YES Clean the guide.
._____
NO Ground the rollers properly.
Y E S Clean the roller. If it is not

possible to clean it. replace
it.
N O Clean the paper feed guide.
6-20

I-7 Vertical black streaks
Possible Ca”sP step Check Result Procedure
IWE c a r t r i d g e 1 Open the upper cover while printing is YES Replace the carlridge.
performed. and open the protective
shield of the rartridge. Are vertical
Fixing unil I NO Replace the fting unit.
black streaks on the drum?
I-8 Irregular and smudged vertical bands
Possible cause 1 Step 1 Check 1 Result ( Procedure I

El’-E cartridge 1 Does the print quality improve when YES Replace the cartridge.
I I the cartridge Is replaced? I I I
6- 21

CIMPTER 6
/ I - 9 / Irregular and smudged horizontal bands 1
Check Procedure
the bands appear at regular Replace the cartrtdge.

intervals?
6-22

CHAPTER 6
1 I - 10 1 Blank spots 1
Is the recommended paper being used?
Replace the paper. Instruct

the customer to wrap and
store the paper to prevent it
from becomlng damp.
Is the transfer charging roller dirty or YES Replace the
deformed? KlllW.
EP-E cartridge 4 Does the print quality improve when YES Replace the cartridge.
the cartridge Is replaced7
High-voltage 5 Perform a test print. About five seconds YES Check whether the hlgh-
power supply after the main motor starts, does the voltage contact is making
I’CB voltage between 5210.9 (SLOZ) and good contact with the
(Developing J2 1 O- 10 (GNDI on the DC controller developing bias contact of
bias) PCB become about 0.76 VDC? the cartridge. If it is. replace
the high-voltage power
supply PCB.
PCB. PCB.
6-23

---
CHAPTER 6
1 I - 11 1 Solid vertical white lines 1
Lark of toner
T Check
Is there one or more straight vertical
1 Result
: YES
Procedure
Take out the cartridge, rock
white streaks of uniform width? it as shown in Section III of
Chapter 4 to distribute the
toner evenly. then put it
back.
Open the protective shield of the YES Replace the cartridge.
cartridge. Are vertical white streaks
on the drum surface?
Is paper dust adhering to the reflection YES Replace the laser/scanner
mirror in the laser/scanner unit7 unit.
F-
Is any fore@ matter, such as a hair. Remove the foreign matter.
~_____
adhering Lo the laser outlet of the Replace the laser/scanner
pnnter or the laser Inlet of the
_L
ca;&,@ unit.
6 - 24

CHAPTER 6
1 I - 12 1 Faulty registration 1
Possible cause Steps 1 _ _ Check _ _ __R”“lti Procedure
Number of 1 Is the multi-purpose tray or the YES Advise the user not to load
sheets cassette overloaded? the tray or the cassette with
excessive amount of paper.
the registration is adjusted?
6 - 25
CHAPTER 6
I- 13 Poor fixing
Possible I‘BUSP Sle P Check Procedure

rranster I Is the transfer charging roller dirty? YES Clean the roller. If it is not
zhargtng roller possible to clean, replace it.
Thermistor 2 Oblain Len test prints. Is the last YES Replace the thermistor.
imaee lilhter than the first?
Fixing rollers 3 Does Poor fixing occur in a vertical YES Check whether the upper
[upper and band? and lower fixing rollers are
lOV”WI damwed.
Is the lower fming roller dirty’? YES Clean the roller. If it is not
possible lo clean it, replace
it.
__~~
Ii-the nip width correct? YES Perform a print using the
recommended paper. If the
problem disappears, advise
the customer to only use th
recommended paper.
NO Replace the fixing unit.
i
6 - 26

CHAPTER 6
1 I - 14 1 Distortion I
I - 15 Missing BD signal
ml LP
Possible cause Step
Connector 1
Check
Are connertors 5205 and 5206 on the

Result
NO
Procedure
Attach the connectors.

DC controller PCB making good
contact?
2 Is conneclor J731 on the BD PCB NO Attach the connector.

making good contact?
_
Iasrr/scanner 3 Check by using the laser malfunction YES Replace the laser/scanner
unil diagnosis flowrhart In Section II1 C of unit.
DC controller this chapter. NO Replace the DC controller
Pen Is the laser/scanner unit faulty? Pen.
6 - 27

CNAPTER 6
W h e n performing any of the corrective actions described below, exercise the following
precautions:
1. When measuring voltages at designated connector pins, first check the connector for
faulty contacts.
2 . Remove the expansion ROM PCB, ROM SIMM, RAM SIMM. and font card from the
printer.
3 . When you replace the video controller PCB. remove the EEPROM from the old PCB
and mount it on the new PCB.
M-l No AC Power

Line voltage 1 Is the correct voltage present at the NO Advise the user that the
outlet? correct line voltage is not
available at the outlet.
Power plug ~ 2 Is the power cord securely plugged NO Push the power plugs in
+
into
3~~~~~
the printer and the outlet?
~_..________~._ firmly.
Cirruit Is the circuit breaker OFF? YES Turn the circuit breaker
breaker ON. If the breaker turns
OFF again as soon as the
power is switched ON,
check for a short circuit.
wiling 4 Pull out lhe power cord. Measure the YES Check the AC power line.
Power supply ~ resistance between the two terminals NO Replace the power supply.
of the power switch by contacting the
test leads against the terminals. Is the
resistance zero when the switch is
turned ON, and infinite when it is
turned OFF?
6 - 28
CHc’WTER 6
M-2 No DC Power
Possible cause Slep Check 1 Result Procedure
OVCKIl~~~llt I Does the problem improve when the ! YES Determtne why the over-
detection power switch is turned OFF, then back current detection circuit of
rirruit ON? the power supply activates.
AC power Detach connector J 102. Turn the c Check by following the
2 ~ NO
power switch ON. Is AC power present steps in M- 1. *No AC
between J 102-l and J 102-2 of the AC Power”.
power supply?
WiriI>g 3 Turn the power switch OFF, detach YES , Check the wiring from the
DC load connector J 103. Turn the power ’ DC controller PCB and DC
DC controller switch ON, and measure the voltage load. If it is normal. replace
PCB between the terminals shown in the the DC controller PCB.
Power supply table below. Is the voltage normal? Replace the power supply.
Status indication display on control panel does not work

M-3 properly.
Possible rause Step Check Result Procedure
Control panel 1 Does the problem improve when you YES Replace the control panel.
Video replace the control panel ? NO Replace the video controller
controller PCB PCB.
M-4 Beeper on the control panel keeps sounding.

Is the voltage between connector 54-l 1 Replace the video controller
(Buz) and 54-13 (GND) on the video
controller PCB about 5 V?
6 - 29

CHAPTER 6
/ M - 5 1 Control panel LEDs do not light. /
Possible caust- Slep Check Procedure
Control panel 1 Does the problem Improve when you YES Replace the control panel.
replace Ihe control panel?
Video NO Replace the video controller
controller PCH PCB.
M-6 Control panel switch malfunction
Check Procedure
Werr switches turned ON/OFF Turn ON/OFF the switches

according to Section V of Chapter I?
~~~~~~- ~~~~ .~ arcordinF[ to Section V of
Chapter ;.
Control panel 2 Does the problem improve when you YES Replace the control panel.
Video replace the control panel? NO Replace the video controller
conirollPr PCB PCB.
6 - 30

CItApTER 6
Printer detects a jam and stops even though a paper jam has not
M-7 OCClUTCd
Conrwrt Ihe printer driver tester to

Regist paper the printer. Is the REGIST SENSOR paper sensor arm is
sensor LED of the tester ON’? damaged. If it is , replace
it; if it is not. replace the
regist paper sensor.
Sensor arm --.!I

Is the DELIVERY SENSOR LED of the YES Check whether the delivery
Delivery tesier ON? paper sensor arm is
paper sensor damaged. If it is, replace it:
I
if it is not, replace the
delivery paper sensor.
Pick-up motor Replace the pick-up motor

driver PCB driver PCB. If the
DC ~ontrollcr problem persists, replace
PCB the DC controller PCB.
5 Is the rcgist paper sensor arm or Replace the damaged paper

delivery paper sensor arm damaged? sensor arm.
Dclivrty ’ 6 Replace the delivery paper

paprr smsor sensor.
t
P i c k - u p “lotor 7 When the regist paper sensor arm is YES Replace the pick-up motor
driver PCB moved, does the voltage between driver PCB. If the problem
DC rontroller connectors J605-6 CRESS) and persists after replacing the
J605-5 IGND) on the pick-up motor PCB. replace the DC
driver PCB change from about 5 VDC controller PCB.
to zero?
NO Replace the regist paper
sensor.
6-31

L
CHAPTER 6
“11 PAPER OUT’ appears even though paper is loaded in

M-8
the selected paper source.
Possible cause s tep Check esult Procedure

Has the upper cassette been selected? YES Proceed to step 5 and
subsequent steps.
2 Has the multi-purpose tray been YES Proceed to step 7 and
/ selected? subsequent steps.
3 Has the lower cassette been selected? k-ES Proceed to step 9 and
/ subsequent steps.
4 Has the envelope feeder been selected? YES Proceed to step 11 and
/ subsequent steps.
5 Connect the printer driver tester to the NO Replace the pick-up motor
printer. When the upper cassette size driver PCB.
i sensing stitch is pressed, does the
PAPER SIZE LED of the tester lleht?
1
6 When a cassette containning paper is Replace the DC conlroller
loaded in the printer, does the U-CASS PCB.
LED of the tester light? NO Replace the cassette paper
sensor.
__~_______
7 Is the print paper loaded correctly? NO Load the paper correctly.
DC controller 8 Connect the printer driver Lester to the YES Replace the DC controller
PCB printer. When paper is put on the PCB.
Sensor PCB multi-purpose tray. does the MP TRAY NO Replace the sensor PCB.
(multi-purpose LED of the tester light?
tray paper
!X”SOr)
Paper feeder 9 Connect the printer driver tester to the NO Replace the paper feeder
driver PCB printer. When the paper feeder driver PCB.
(cassette size cassette size sensing switch is pressed
senstng does the PAPER SIZE LED of the testa
switch) light?
DC controller 10 when a cassette containning paper is YES Replace the DC controller
loaded in the printer. does the PCB.
L-CASS. LED of the tester light? NO Replace the paper feeder
driver PCB.
7 Are envelopes loaded correctly? NO Load the envelopes

colTectlv.
DC controller
i---- 12 Connect the printer driver tester to the YES Replace the DC controller
IPCB printer. When an envelope is loaded PCR.
Envelope in to the envelope feeder, does the NO Replace the envelope feeder
feeder driver ENVELOPE SENSOR LED of the tester driver PCB.
PCB (envelope light?
feeder paper
I
6-32

CHAPTER 6
~~etects a jam and stops even though a paper jam has not
M-7
Possible rnusr
Operalion
mistake
_ ,‘.
Sensor arm
&gist paper paper sensor arm is
sensor damaged. If it is , replace
it: if it is not, replace the
regist paper sensor.
Sensor arm Check whether the delivery

Delivery tester ON? paper sensor arm is
paper sensor damaged. If it is, replace it:
if It Is not, replace the
delivery paper sensor.
-
Pick-up motor NO Replace the pick-up motor
driver PCB driver PCB. If the
DC rontrollw problem persists, replace
PC13 the DC controller PCB.
Sensor am, 5 Is the regist paper sensor arm or YES Replace the damaged paper
delively paper tensor arm damaged? sensor arm.
Delivery 6 When the delivery papel- sensor arm NO Replace the delivery paper
paprr sensor is moved, does the voltage between sensor.
connertors 5208.3 (I’SNS) and 5208-2
(GNU on the DC controller PCB
change from zero to about 5 VDC?
Pick-up motor 7 ’ When the regist paper sensor arm is YES Replace the pick-up motor
driver PCN moved. does the voltage between driver PCB. If the problem
mc r0ntrdier connectors J605-6 (RESS) and persists after replacing the
PCB J605-5 IGND) on the pick-up motor / PCB. replace the DC
driver PCB change from about 5 VDC controller PCB.
;+--__
Rrgist paper to zero?
/ NO Replace the regist paper
sensor / sensor.
I
6-31

CHAPTER 6
1 M-9 1 “12 PRINTER OPEN” appears even though the printer is closed.
Check Result Procedure
Upper cover Is the upper rover actuator dama.@d? YES Replace the upper cover.
DC controller 2 Is the voltage between connector Replace the DC controller
PCB J601-6 (DOPEN) and 5601.10 (GNDI
Pick-up motor on the pick-up motor driver PCB zero Replace the pick-up motor
driver PCB when thr upper cover is closed?
M - 10 “14 NO TONER CART’ appears even though a catridge is loaded.
1 Possible cause 1 Step 1 Check j Result Procedure I

E P - E cartridee 1 1 Is the cartridge loaded properly?
DC controller 2 Turn the printer OFF, connect the

PCB printer driver tester. and turn the
power back ON. Does the
Hi&-voltage
CARTRIDGE SENSOR LED of the
power supply
tester light for a while after the power
is turned ON ?
6 - 33

CHAPTER 6
M- 11 “16 TONER LOW” indicator does not light properly.
Possible cause Step Check 1

Result Procedure
v--
EP-E cartridge 1 Shake the cartridge following the The toner is insufficlent.
instructions. and load it in to the Prepare a new cartridge.
printer. Does the message disappear7
HIghmvollage 2 Clean the high-voltage
power supply contact.
(high-voltage
contacts)
D C rontrollcr 3 Turn lhr printer OFF. connect the Replace the DC controller
PCB , printer driver tester, and turn the PCB.
power back ON. Does the TONER
SENSOR LED of the tester light for a
HtgbVOltag~ while aftw the power swKch is turned Replace the high-voltage
powrr supply ON. power supply PCB.
M - 12 Faulty Pick-up Motor
step Check 1Result / Procedure
Are the ronneclors (J60 1. J602) from Reattach the connectors

connector 5201 on the DC controller
PCB to connector J701 on the sensor
PCB making good contact?
Sensor PCB ’ 2 Are the connectors 5701 and J702 on Replace the sensor PCB
the sensor PCB properly aligned ?
___+_-
Pick-up motor 3 About on? second after switch is
_ ____~
turned ON. do the voltages between
Pick-up molar
the following pairs of terminals on the
driver PCB driver PCB. If the problem
DC controller pick-up motor driver PCB change from
PCB about 24 VDC to about 15 VDC?
PCB. replace the DC
. J701-Al (PA) and J701-A5 (GND)
controller PCB.
1 ’ 570 l-83 (PB) and 570 1 -A5 (GND)
6 - 34

1 M - 13 1 Faulty Paper Feeder Pick-up Motor 1
Check Procedure
P i c k - u p nwtor 2
driwr PCB paper frrdrr is replaced? driver PCB. If the problem
DC controller persists after replacing the
PCB PCB, replace the DC
controller PCB.
Plarr some paper in the lower cassette
and prrlbmm a test print by using the
printer drivrr tester. After the
prescribed time. do the voltages
belwcen the following pairs of
Crrminals on the paper feeder driver
PCB change from about 24 VDC to
about 15 VDC?
.J852- 1 [A) and 5851.4 (GND)
J852-3 (HI and J85 l-4 [GND)
I l
/ M - 14 1 Faulty Envelope Feeder Pick-up Motor 1
Check lesult Procedure
Are Ihe connectors (J601, 5604. 5136, N O IReconnect the connectors.

.I9311 lrom connector 5201 on the DC
controller PCB Lo connertor 5932 on
the envelope feeder driver PCB making
good contact?
Does the problem improve when the NO Replace the pick-up motor
driver PCB envelope feeder is replaced7 driver PCB. If the problem
PCB PCB, replace the DC
controller PCB.
Envelope 3 Place some envelopes on the envelope Replace the envelope feeder
feeder pick-up feeder and perform a test print by pick-up motor.
motor using thr printer driver tester. After
the prescribed time, do the voltages
Envelope NO Replace the envelope feeder
feeder driver between the following pairs of driver PCB.
PCB terminals on the envelope feeder driver
PCB rhange from about 24 VDC to
about 15 VDC7
l 5932.1 (A) and J93 I-4 [GNDI
l 5932.3 (B) and 5932.4 (GNDI
Note: Before checking the envelope feeder operation, be sure to hold the bottom of the PCB up
or lape il to the frame if the right cover is removed.
6 - 35

---
CHAPTER 6
M- 15 No Paper Pick-up from Upper Cassette
Video 1 Place some paper in lhe upper YES Replace the video controller
controller cassette and perform a test print by PCB.
PCB using the printer driver tester. Is the
paper picked up from the cassette?
~~~.~ ~,.._ ~~__~~~... ____.
Pick-up 2 Plare some paper in the upper NO- Check by following the
motor cassette and perform a test print by steps in M- 12. “Faulty
using the printer driver tester. After Pick-up Motor”.
the prescribed time, does the pick-up
motor start running?
_~
Pick-up 3 Place some paper in the upper NO Replace the pick-up motor
motor driver cassette and perform a test print by driver PCB. If the problem
Pen using the printer driver tester. After persists after replacing the
DC controller the prescribed lime. does the volt@? PCB. replace the DC
PCB between connectors J602-A3 (1ST) controller PCB.
and J602-A5 @ND) on the pick-up
motor driver PCB change from 0 V to
about 1.3 VDC?
Cassette feed 4 When step 3 is carried out. does the YES Replace the cassette feed
roller clutch voltage between connectors J704-2 roller clutch solenoid.
solenoid (1 STD) and 5704.1 (24v) on the sensor
_ ._______
PCB change from 0 V to about 24
Sensor PCH NO Replace the sensor PCB.
VDC?
6-36

CHAPTER 6
M-16 I No Paper Pick-up from Multi-purpose Tray
Possiblr CilUSC S1ep Check Result Procedure
Vid?” I Place some paper on lhe multi-purpose YES Replace the video controller
rontrollcr lray and perform a test print by using PCB.
Pen the printer driver tester. Is the paper
picked up from the lray?
Pick-up 2 Place some paper on the multi-purpose NO Check by following the steps
motor tray and perform a Lest print by using in M- 12. “Faulty Pick-up
the printer driver tester.After
the M010r”.
prcscrtbed time, does the pick-up
motor w-art nlnntng?
Pick-up 3 1 Place some paper on the multi-purpose Replace the pick-up motor
m”tor driver tray and perform a test print by using driver PCB. If the problem
PC13 the printer driver tester. After the perslsls after replacing the
DC ~antroller prescribed time, does Che voltage PCB, replace the DC
PCB between connectors J602-A2 (MP) and controller PCB.
J602-A5 (GND) on the pick-up motor
driver PCB change from 0 V Lo about
1.3 VDC?
MP tray 4 When step 3 is carried out. does the YES Replace the MP tray pick-q
pirk-up roller voltage between connectors 5702-2 roller clutch solenoid.
clutch (MPD) and 5702.1 (24W on the sensor
solenoid PCB change from 0 V to about 24
Sensor PCB VDC? NO Replace the sens”r PCB.
6 - 37

CHAPTER 6
M-17 1 No Paper Pick-up from Lower Cassette
f’ossiblr cause ! Step Check R‘ZSUll Procedure

~~~_ ~~~~~~ ~~_~ _~~ _ _ _ _ _ _
Video I Place some paper m the lower cassette YES Replace the video controller
rontroller and perform a test print by using the PCB.
I’CH printer driver tester. Is the paper
picked up from the cassette?
Pick-up motw , 2 Replace the pick-up motor
driver PCB paper feeder is replaced7 driver PCB. If the problem
DC con1 roller persists after replacing the
PCR PCB, replace the DC
controller PCB.
I’irk-up motor 3 PLacr paper in thv lower cassette and Check by following the step:
perform a test pnnt by using the in M- 13. “Faulty Paper
printrr driver tester. After the Feeder Pick-up Motor”.
prescribed time. does the paper feeder
pick-up motor start running?
Paper tedcr 4 Plarc paper in the lower cassetlr and Replace the paper feeder
pick-up roller perform a tesl print by using the pick-up roller clutch
rlutrh solenoid printer driver lesler. After the
prrscrib?d lime. does the voltage
between connectors 5853.3 (PSTD) 1 _~__
Paper feeder and 5853-l [24X’) on the paper feeder NO Replace the paper feeder
driver PCB I~drlcrr PCR change from 0 V to about driver PCB.
24 VDCP
I
M-18 1 No Envelope Pick-up from Envelope Feeder
Possible rause step Check
Envelope
I YES I Change the envelopes.
2 Place envelope on the envelope feeder / YES 1 Replace the video controller
and perform a test print by using the PCB.
printer driver tester. Is the envelope
picked up from the feeder? ~ ~
3 Does the problem disappear when the YES Check according to M-14.
envelope feeder is replaced? “Faulty Envelope Feeder
: Pick-up Motor”.
Pick-up motor
driver PCB driver PCB. Lf the problem
PCl? PCB. replace the DC
controller PCB.
6 - 38

CHAPTER 6
M - 19 Poor Output from High-voltage Power Supply
Hi&volta@ 1 Is any terminal of the high-voltage YES Clean the terminals of the
rontart ronnertor dirty or rarbontzed? high-voltage contact.
I tigh-vottag? Does the problem improve when the YES Replace the high-voltage
powrr supply high-voltage power supply PCB is power supply PCB.
PCH replaced?
I2
DC ronlmllrr NO Replare ihe DC controller
PCB PCB. If the problem persists
Connertor after replacing the PCB.
PCB replace the connector PCB.
M - 20 Faulty Exhaust Fan
Posstble ~‘aw%’ step Check Procedure

i
Connertor Is ronnector
J209 on the DC controller Reattach the connector.
PCB making good contact?
Exhaust fan , D&ouch~~~~~~~
connector 5211 on the DC ~~----
Replace the exhaust fan. ----
DC conlrotler rolltroller PCB.
Replace the DC controller
PCB Immediately after the power is turned
i I ON, does the volta@z between
ronncrlors J209-I .(FAND) and 5209.3
(GND] on the DC controller PCB
change from 0 V to about 24.5 VDC.
then to aboul I6VDC?
1 M - 21 / Laser Malfunction /
Possible cause 1Step 1 Check 1Kesult 1 Procedure
~~~ ~ C h e c k b y u s i n g t h e l a s e r
malfunction diagnostic
DC controller flowchart in Section III C.
6 - 39
ClMPTER 6
M - 22 “5F-50 SERVICE” Message
Possible rause step Check :‘ZSUll Procedure

Conner1er Are connector JZ 10on the DC NO Reattach the connectors
rontroller PCB and connectors 5741
and 5743 on the connector PCB
making good contact?
Broken 2 Remove Lhe f&ng unit and measure NO Check the wiring from
thermistor the resistance between connectors connector 5210 on the DC
wire 5743-6 and J743-7. Is the resistance controller PCB to the
180 to 280 kQ (at room temperature)? thermistor. If whlng is
proper. replace the
thermistor.
Fixing roller 3 Remove the fling unit. Is there NO Check continuity in the
heawr continuity beiween connector 5743-1 fixing roller heater and
Lhermoswitch and 5743-8 on the fbdng unit? thermoswitch individually.
Replace any defective parts
DC controller Open the delivery cover and let the NO Replace the DC controller
PCB fixing roller cool. Close the cover and PCB.
switch the power ON. Is the voltage
between connectors J212-1 (/FSRD)
and TBZOl-6 IGND) on the IX
controller PCB initially about 5.1 VDC.
and does it change to about 1.5 VDC
as the 0xln.g roller warms up?
Power supply Switch the power ON. Is the voltage YES Replace the power supply.
between ronneclors 5212.2 (RJD) and
DC controller TB201-6 (GND) on the DC controller NO Replace the DC controller
PCB PCB about 5 VDC? PCB.
Note: If this message is displayed, turn the power OFF, and do not switch the power ON for
about ten minutes.
If you switch the power ON within ten minutes, the printer will automatically shut OFF
the current to the fting roller heater to prevent overheating.
1 M - 23 1 “5F-51 SERVICE” Message 1
Possible cause step Check LSUli Procedure

EP-E cartridge Is the laser beam shutter open/close YES Replace the cartridge.
boss of the EP-E cartridge damaged?
Laser/scanner Are connetors 5205 and 5206 on the YES Check by using the laser
unit DC controller PCB making good malfunction diagnostic
DC controller contact? llowchart in Section III C.
PCB
NO Reattach the connecters.
6-40

1 M-24 / “5F-52 SERVICE” Message
Possible cause Step Check ( Result ~ Procedure

C”““WtOr 1 -------~co”“ect the connector.
Is connector 5205 on the DC controller
PCB making good contact? I
Power supply 2 Does the voltage between connectors ( Check whether +24 VDC is
5205-6 (24VA) and J205-4 IGND) on present between connectors
the DC controller PCB become about TBZO l-3 (24VAl and
24 VDC? TB20 l-6 (GND) on the DC
controller PCB. If it is not,
Laser/scanner 3 Replace the laser/scanner

unit between connectors J205-7 (JSCNON)
DC co”lroller and 5205.4 (GND) on the DC Replace the DC controller
PCH controller PCB change from about 5
VDC to 0 V?
/ M - 25 1 “5F-54 SERVICE” Message 1
) Possible rause ’ Slep 1 Check 1Result 1 Procedure

Ar? connector 52 11 on the DC NO Reconnect the connectors.
controller PCB and connector 5131 of
the main motor making good contact?
About one second after switch is turned Reulace the main motor.
DC controller 1ON. does the voltage between connectors NO R&lace the DC co”troller
PCB 5211.2 (/MON) and 5211.3 (GND) PCB.
change from about 5 VDC to 0 V?
6- 41

CHAPTER 6
A. Print Paper Jams

Paper passes through two major sections in the printer: (11 the pick-up section and (2.1 the
fixing and delivery section. The following explains how to troubleshoot jams in each of these
serlions.
\/
r A
Figure 6-10
I: Pick-up section
2: Fixing and delivery section
6 - 42

CHAPTER 6
1 T-l 1 Pick-up section
I’ossiblr C~USP ~ Step Check
Print paper
’ 1
Is the paper curled or wrinkled? Replace the paper. Advise

; 2
the customer on how to
store the paper.
3 Does this problnn “CI‘UT with the YES Proceed to step 8.

casscttc feed?
4 Does this problem occur when feeding YES Poceed to step 13.
from th? envelope feeder?
PIint paper 5 Does the left leading edge of the prinl NO Load the paper correctly
loaded paper touching the end of the into the multi-purpose
inrorrectly on multi-purpose 1 ray? tray.
the
multi-purpose
tray
Too much 6 Is th? multi-purpose tray overloaded? YES Advise the user not to load
paper on the the excessive amount of
multi-purpose paper.
tray
Pick-up roller 7 Dors the pick-up roller rotate when YES Replace the roller.
Pick-up lailure printing is performed?
NO Check by following the step:
in M- 16. “No Paper Pick-up
from Multi-purpose Tray”.
CWS<!llP 8 Is the cassette positioned correctly in NO Position the cassette

thr printer or the paper feeder? correctly.
Paper loaded 9 Is lhe paper touching the cassette NO Load the paper correctly.
inrorrrctly i n hook properly?
the rasseltr
Paper 1s the paper folded? YES Replace the paper.
‘I.“” much 1s Ihe cassettr overloaded? YES Advise the user not to load
paper in the excessive amount of
cassette paper.
CasWllr 12 Are the cassette pick-up rollers worn YES Replace the rollers.
pick-up rollers or deformed?
Pick-up failure ~ NO Check by following the

steps In M- 15 “No Paper
Pick-up from Upper
Cassette”, or in M- 17. “No
Paper Pick-up from Lower
Cassette”.
6-43

CEiApTER 6
Possible cause step Check Result Procedure

4~. -- !
Envelop? Are the proper envelopes being used in Advise the user to only use
the envelope feeder ? the recommended
I I31 envelooes.
Numberof t 14 Are1 there
~~~~_____~
too many envelopes in lhe
enVt?lopCs envelope feeder ? number of envelopes.
Envelop? 15 Is the envelope guide exerting excess
guide pressure on the envelopes? set the envelope guide too
tightly against the
t&up roller 1 16 1~ Are~~any rollers worn or deformed? defective rollers.
Check in the same manner

as for M-18 “No Envelope
Pick-Up from Envelope
Feeder”.
T-2 Fixing and delivery section

~_~
Enlrance Is the entrance guide dirty?
1 YES Clean the guide.
guide Is the guide damaged or is there toner
~~~ ; onI!!_ ~~~ ~ .________
Delivery guide 2 Is the delivery guide dirty? YES Clean the guide.
Is the guide damaged or is there toner
on it7 ____________
Lower fLwing 3 Is the lower fting roller dirty? YES Clean the roller.
I-OlllT
-_______ -_______
Paper sensor 4 Does the sensor arm (fixing unit side, YES Check the movement of the
X-Ill printer side] move smoothly? delivery roller.
---_________
Dellvely roller NO Adjust the roller to move
smoothly.
6-44

CHAPTER 6
B. Incomplete Paper Feed
T-l Sheets stuck together
1 Possible CaUsC i Step / Check 1Result 1 Procedure I

Paper Is the recommended paper being Advise the user to only use
~’ j used? the recommended -zmer.
Separation 2 Is the surface of the separation pad
pad WOI”?
Cassette
T-2 Wrinkles
Print paper 1 Is the recommended paper being used? NO Advtse the user to only use
the recommended paper.
2 Does the paper stop becoming YES Advlse the customer on hov
wrinkled when new paper is used? to store the paper to preven
i it becoming damp.
Pirk-up unit 3 - Open the printer while a sheet of YES Check the pick-up unit.
paper is passing through the feeder
unit after pick-up. Is the paper
wrinkled at thts point’? Is the paper
skewed?
Entrance Is the entrance guide dirty? YES Clean the guide.
Is the lower ftxing roller dirty?. YES Clean the roller.

NO Replace the fixing unit.
6 - 45

--
C!HAFTER 6
A. Switches
Figure 6- 11
6 - 46

CHAPTER 6
Table 6-5
Function
Upper cassette size-sensing switch 1

Upper cassette size-sensing switch 2
Upper cassette size-sensing stitch 3
Lower cassette size-sensing switch 1 (paper feeder)
Lower cassette size-sensing switch 2 (paper feeder)
Lower cassette size-sensing switch 3 [paper feeder)
6 - 47
CHAPTER 6
B. Sensors and Solenoids
esgure 6-12
6 - 48
CHAPTER 6
Table 6-6
Symbol Name Symbol Function
Photointerrupter PS201 Delivery paper senscn

PS601 cassette papa- sensor
PS602 Regist paper sensor
PS701 Multi-purpose tray paper end sensor
PS702 Multi-puqxse tray paper sensor
PS651 Paper feeder paper sensor [paper feeder)
PS931 Envelope feeder paper sensor (envelope feeder]
ou ~So’enoid SL701
SL702
Cassette pick-up roller clutch solenoid
Multi-purpose tray pick-up roller clutch solenoid
SL851 Paper feeder pick-up roller clutch solenotd [paper
1feeder)
6 - 49

CHAPTER 6
C. Motors and Others
Figure 6- 13
6 - 50

CWAPTER 6
Table 6-7
Symbol Name 1Symbol / Function
0
MOtOI Ml Drives the photosensltive drum and feed rollers
M M2 Drives the paper pick-up rollers
M3 Drives the paper feeder pick-up rollers (paper feeder)
M4 Drives the envelope feeder pick-up rollers Ienvelope
feeder)
M5 Drives the scanning mirror
Fan motor FM1 Exhaust fan
Fixing roller heater Hi Heats the upper fixing roller
Thermistor Ttil 1Detects the upper fLving roller surface temperature
6-51

D. PC Boards
Ngwe 6-14
6 - 52

CHAPTER 6
Table 6-8
Name Function
L
IX umtro1kT PCB Controls the pnnting sequence
High-vollage power supply PCB Applies high voltage to the primary and transfer
rhaging rollers and the developing cylinder
Pick-up motor driver PCL3 Drives the motors and the solenoids
Sensor PC0 Relays signals between the sensors. solenoids, motors.
and pick-up motor driver PCB
Video conlrollrr PC13 Processes I/O between the printer and the external
device, and various data.
Expantion ROM PCB Conlrols the timing when the video controller unit
CPU gives access to the ROM-SIMM module mounted
on the expantion ROM PCB.
Paper feeder driver PCB Drives the paper feeder clutch and the motor [paper
feeder)
Envelope feeder driver PC13 Drives the envelope feeder motor (envelope feeder)
6 - 53

~-
--
CHAPTER 6
E. Connectors
Figure 6-15
6 - 54

CHAPTER 6
Figure 6-16
6 - 55

CRAPTER 6
Variable resistors, LED indicators, test pins. jumpers. and switches that are made use of when
servicing are listed below.
Any variable resistors, test pins, etc., not listed below are for factory use only: they require
special tools and measuring instruments, and must be set with high precision. Do not touch
them when servicing.
Notes: 1. Some LEDs receive leakage current during normal operation, causing them to glow
dimly when they should be OFF.
2. Polentiometers that may be adjusted when servicing are marked __.....,....,
0
Potentiometers that may not be adjusted when servicing are marked .,....,
A. DC Controller PCB
J206
J203 6/11
J204
J202
5213
1 u
P
J209
J201 3
l-l 13
0
CP202
1
J212 ,I TB20’ I:“;, J2” ,, ,IO J2’0 1,
3
Figure 6-17
Table 6-9 Table 6-10
VR No. Function
VRZO2 Adjusting leading-edge
6 - 56

CHAPTER 6
B. High-voltage Power Supply PCB
I-
TB401 TB402 TB403 TB404
0 II
VR40
TB406
5401
Plgure 6-18
Table 6- 11
m No. Function
vFC401 For factory use I
6 - 57

CHAPTER 6
C. Pick-up Motor Driver PCB
Table 6-12
cl
SW602
SW No. FUlICtiOn
SW601
I l3 SW60 1 Door sensing stitch
J601 SW602 1 Test print switch
SW603
1 0 Cassette size sensing switch
sw6o4 (See page 2-28 .I
J603 4 SWfmFi I
1 II
1
J604
4
1
J605
6 Al A5
SW603 0
SW604 0
SW605 0
D. Paper Feeder Driver PCB
Table 6-13
SW No. I Function
SW80 1
sw8o2 Cassette size sensing switch
(See page 2-28 .I
SW803
0: J852
c J
Fi@m 6-20
6 - 58

APPENDIX
1. GENERAL TIMING CHART.. .... A - l VI. SENSOR CIRCUIT... . . . . . . . . . . . ..a.. A-11

IL LIST OF SIGNALS.. ................. A-3 VII. PAPER FEEDER DRIVER . . . . . . . . A- 12
DtI. GENERAL CIRCUIT.. ............... A-6 VIII. ENVEL0PE FEEDER DRIVER.. A- 13
N. DC CONTROLLER.. ................. A-7 IX. EXPANSION ROM CIRCUIT ma... A-16 -
. PICK-UP MOTOR DRIVER.. ..... A-S
.
.

l Timing chart for two consecutive prints on A4 paper (Cassette feed) I. GENERAL TIMING CHART
Power switch ON (Unit: Seconds)
n
Operation STBY INTR 1 PRINT LSTR STBY
Exhaust fan (FMI)
7 Main motor (Ml)
11 Registpapersensor(PS6G2) 4k-.3
I I I
12 Delivery paper sensor (PS201) I I I
13 Primary voltage (AC)
14 Primary voltage (DC) 1’ I

I-_I 1.1 _i k 0.32
15 Developing bias (AC) I o.3
- I I I I
A-l

APPENDlX
II. LIST OF SIGNALS
A. DC controller
Abbreviation N8lUe
APCIN AUTOMATIC POWER CONTROL INPUT signal (analog)
APCOUT AUTOMATIC POWER CONTROL OUTPUT signal (analog)
/Lm BEAM DETECTION (Horizontal sync pulse) signal
/ BDI BD 1NPLJT signal
/CBSY COMMAND BUSY signal
/CCLK CONTROLLER CLOCK signal
/CMD COMMAND signal
/CPRDY CONTROLLER POWER READY signal
DOPEN DOOR OPEN DETECT signal
/ENBL VIDEO DATA ENABLE signal
FAND EXHAUST FAN DRlVE signal
FLOCK EXHAUST FAN LOCK DETECT signal
/ FSKD FIXING ROLLER HEATER DRIVE signal
FSRTH FIXING ROLLER SURFACE TEMPERATURE signal
HVRST HVT RESET signal
/LON FORCIBLE LASER ON signal
/MON MAIN MOTOR DRIVE signal
/MRDY MAIN MOTOR READY signal
/PCLK PRINTER CLOCK signal
/PPRDY PRlNTER POWER READY signal
/ PRNT PRINT signal
PSNS DELIVERY PAPER SENSOR signal
/RDY READY signal
RLD RELAY DRIVE signal
SCNCLK SCANNER REFERENCE CLOCK signal
/SCNON SCANNER MOTOR DRIVE signal
/SCNRDY SCANNER MOTOR READY signal
/ SBSY STATUS BUSY signal
/STS STATUS signal
SLl 1 INPUT SERlAL LINE 1
SL12 INPUT SERIAL LINE 2
SLO 1 OUTPUT SERIAL LINE 1
51~2 OUTPUT SERlAL LINE 2
THOUT THERMOSWITCH MONITOR signal
TVIN HVT MONITOR signal
/TVOUT CONSTANT VOLTAGE OUTPUT signal
/VDATA LASER DRIVE signal
A-3
APPENDIX
Abbreviation NSUlle
I
/VDO VIDEO signal
/VSREQ VERTICAL SYNC REQUESI signal

/VSYNC VERTICAL SYNC sinnal
A-4

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LBP-860

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Chapter 1: General Desrriplion

Chapter 2: Operation ancl Timing

Chapter 3: The Mechanical System

Chapter 5: Mainlmanre and Servicing

Information in this manual is subject to change as the product is improved or redesigned.

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CHAPTER 2 OPERATION AND TIMING

CHAPTER 3 THE MECHANICAL SYSTEM

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CHAPTER 5 MAINTENANCE AND SERVICING

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I. FEATURE3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . l - l IV. PARTS OF THE PRINTER.. ...... 1-S

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1. Non-impact page printer

4. Roller charging/transfer system

5. Space-saving front loading for paper feed

6. Four paper feed methods with various options

7. Automatic interface change function

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I~ Desktop pa@ printer

A4. Letter. liniwrsal (Lc@l, Letter. A4, Execuliw, B5)

IO to 32.5’C (50 to 90.5-F]

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Standard: Enhanced PCL (PCL 5e)

2MU (Expandable lo 8 Megabytes in total with optional ROM SIMM)

KS-232C. asynchronous. 300, 600. 1200. 2400, 4800.9600. 19200. or

s-bit parallel (Ccntronirs standard) interface

1E. Envelope feeder (Envelope Feeder EF-4)

[‘irk up spwd Aboul 6 env&prs/min

F. Paper feeder (Paper Feeder Unit PF-4s / PF-4L)

EP-E Cassette 500 Universal S [letter, A4. Executive)

Specifications are subject to change with product improvement. 1

Symbol Pitch Point Stroke T

I050 i PC-850 Fixed 16.67 8.5 Medium Upright Portrait

1051 L E G A L Fixed 16.67 8.5 Medium Upright Portrait

f B o t t o m ~ff( sctlve printing area

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1: Envelope side guide

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B. Cross Sectional View

1: Delivery rollers 9: Oblique rollers

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A. The Operator Panel

READY ALARM DATA a

1. Message/Menu Display Window

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READY The printer is ready to print.

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The paper input source indicators are:

~~~~ ENVELOPE FEEDER

indicator light Mode Description

Envelope On The optional Envelope Feeder is the input source.

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* Need to verify all of this *

* Need final Self Test*

* Nred Jkal Font List *