Lexmark Optra E Service Manual

Optra™ E
4026-0XX
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• Start Diagnostics
• Safety and Notices
• Trademarks
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Lexmark and Optra are trademarks of

Lexmark International, Inc., registered
in the United States and/or other
countries.
4026-0XX
Third Edition (April 1997)
The following paragraph does not apply to the United Kingdom or any country
where such provisions are inconsistent with local law: LEXMARK
INTERNATIONAL, INC. PROVIDES THIS PUBLICATION “AS IS” WITHOUT
WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING, BUT
NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY OR
FITNESS FOR A PARTICULAR PURPOSE. Some states do not allow disclaimer
of express or implied warranties in certain transactions, therefore, this statement
may not apply to you.
This publication could include technical inaccuracies or typographical errors.

Changes are periodically made to the information herein; these changes will be
incorporated in later editions of the publication. Improvements or changes in the
products or the programs described in this publication may be made at any time.
Publications are not stocked at the address given below; requests for publications
should be made to your point of purchase.
Comments may be addressed to Lexmark International, Inc., D22A/035-3,

740 New Circle Road NW, Lexington, Kentucky 40550, U.S.A. Lexmark may use
or distribute any of the information you supply in any way it believes appropriate
without incurring any obligation to you.
Lexmark and Optra are trademarks of Lexmark International, Inc., registered in the
United States and/or other countries.
Other trademarks are the property of their respective owners.
 Copyright Lexmark International, Inc. 1995, 1997

All rights reserved.
UNITED STATES GOVERNMENT RESTRICTED RIGHTS

This software and documentation are provided with RESTRICTED RIGHTS. Use,
duplication or disclosure by the Government is subject to restrictions as set forth in
subparagraph (c)(1)(ii) of the Rights in Technical Data and Computer Software
clause at DFARS 252.227-7013 and in applicable FAR provisions: Lexmark
International, Inc., Lexington, KY 40550.
4026-0XX
Contents 1
Notices and Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . .vi

Laser Notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vi
Safety Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvi
Ozone Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xix
Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xx
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1
Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Maintenance Approach. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Tools Required For Service . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Acronyms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Diagnostic Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Service Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
User Error Message Table . . . . . . . . . . . . . . . . . . . . . . . . 2-6
User Secondary Error Message Table . . . . . . . . . . . . . . . 2-8
Power-On Self Test (POST). . . . . . . . . . . . . . . . . . . . . . 2-10
POST Symptom Table . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
Symptom Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
Service Checks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15
Charge Brush Service Check . . . . . . . . . . . . . . . . . . . . . 2-15
Cover Interlock Service Check . . . . . . . . . . . . . . . . . . . . 2-16
D-Roll Assembly Service Check. . . . . . . . . . . . . . . . . . . 2-16
Exit Sensor Service Check. . . . . . . . . . . . . . . . . . . . . . . 2-17
Fan Service Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17
Cold Fuser Service Check . . . . . . . . . . . . . . . . . . . . . . . 2-18
Hot Fuser Service Check . . . . . . . . . . . . . . . . . . . . . . . . 2-20
Input Sensor Service Check. . . . . . . . . . . . . . . . . . . . . . 2-20
Low Voltage Power Supply Service Check . . . . . . . . . . 2-22
Main Drive Motor Service Check . . . . . . . . . . . . . . . . . . 2-25
Operator Panel Service Check. . . . . . . . . . . . . . . . . . . . 2-27
Optional Paper Tray Two Service Check . . . . . . . . . . . . 2-28
Paper Take-Up Solenoid Service Check . . . . . . . . . . . . 2-32
Parallel Port Service Check . . . . . . . . . . . . . . . . . . . . . . 2-34
Paper Feed Service Check . . . . . . . . . . . . . . . . . . . . . . 2-34
Paper Feed Frame Assembly Service Check . . . . . . . . 2-37
Print Quality Service Check . . . . . . . . . . . . . . . . . . . . . . 2-38
Registration Service Check . . . . . . . . . . . . . . . . . . . . . . 2-44
Transfer Assembly Service Check . . . . . . . . . . . . . . . . . 2-44
Transfer Corona Service Check . . . . . . . . . . . . . . . . . . . 2-45
ROM SIMM Service Check . . . . . . . . . . . . . . . . . . . . . . 2-45
iii
Diagnostic Aids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Power-On Self Test (Post) . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Diagnostic Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Printer Diagnostic Test . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Service Diagnostic Test Page . . . . . . . . . . . . . . . . . . . . . 3-4
User Mode Print Test Page . . . . . . . . . . . . . . . . . . . . . . . 3-6
Paper Feed Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
Fuser Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
Configuration Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
Configuration Mode Operator Panel Overlay . . . . . . . . 3-10
Operator Panel Configuration Mode Button Definition . 3-11
Hex Trace . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
Restoring Factory Defaults . . . . . . . . . . . . . . . . . . . . . . 3-13
Repair Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Handling ESD-Sensitive Parts . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Adjustment Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Print Registration Adjustment . . . . . . . . . . . . . . . . . . . . . 4-2
Removal Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Screw Identification Table . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Board Cage Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Cover Removals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Controller Board Removal . . . . . . . . . . . . . . . . . . . . . . . . 4-5
D-Roll Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
Engine Board Removal . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
Exit Sensor Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
Exit Sensor Flag Removal . . . . . . . . . . . . . . . . . . . . . . . . 4-6
Exit Paper Feed Roller Assembly Removal. . . . . . . . . . . 4-7
Fan Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
Fuser Lamp Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
Fuser Lower Frame Assembly Removal . . . . . . . . . . . . . 4-8
Fuser Upper Frame Assembly Removal . . . . . . . . . . . . . 4-8
Fuser Paper Separator Removal. . . . . . . . . . . . . . . . . . . 4-8
HVPS Board Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9
HVPS Cover Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9
Left Side Plate Removal . . . . . . . . . . . . . . . . . . . . . . . . . 4-9
LVPS Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
Main Drive Motor Removal . . . . . . . . . . . . . . . . . . . . . . 4-10
Main Drive/Paper Feed Gears Removal . . . . . . . . . . . . 4-10
Manual Paper Feed Guide Plate Removal . . . . . . . . . . 4-10
Operator Panel Removal . . . . . . . . . . . . . . . . . . . . . . . . 4-11
Paper Entry Sensor Removal . . . . . . . . . . . . . . . . . . . . 4-11
Paper Entry Sensor Flag Removal . . . . . . . . . . . . . . . . 4-11
Paper Feed Frame Assembly Removal. . . . . . . . . . . . . 4-12
iv
4026-0XX
Removal Procedures (continued)

Paper Feed Solenoid Removal . . . . . . . . . . . . . . . . . . . 4-12
Paper Feed Input Tray Assembly Removal . . . . . . . . . . 4-12
Paper Lift Plate Assembly Removal . . . . . . . . . . . . . . . . 4-12
Paper Separator Removal . . . . . . . . . . . . . . . . . . . . . . . 4-13
Printhead Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13
Print Media Selection Lever Removal (06C/06F/071) . . 4-13
Second Paper Tray Option Connector Removal . . . . . . 4-13
Thermal Fuse Removal (06A/06B/06D/06J/070) . . . . . . 4-14
Thermostat Removal (06C/06F/071) . . . . . . . . . . . . . . . 4-14
Thermistor Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14
Transfer Unit Removal . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14
Connector Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1
Low Voltage Power Supply . . . . . . . . . . . . . . . . . . . . . . . 5-1
High Voltage Power Supply . . . . . . . . . . . . . . . . . . . . . . . 5-2
Engine Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
Second Paper Tray Sensor Board (Option) . . . . . . . . . . . 5-7
Controller Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7
Paper Exit Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-11
Paper Entry Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-11
Paper Feed Solenoid . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-11
Parts Catalog . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1
How To Use This Parts Catalog . . . . . . . . . . . . . . . . . . . . . . . 6-1
Assembly 1: Covers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
Assembly 2: Frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6
Assembly 3: Printhead . . . . . . . . . . . . . . . . . . . . . . . . . . 6-12
Assembly 4: Paper Feed Input Tray. . . . . . . . . . . . . . . . 6-14
Assembly 5: Paper Feed Frame. . . . . . . . . . . . . . . . . . . 6-16
Assembly 6: Fuser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-18
Assembly 7: Electronics . . . . . . . . . . . . . . . . . . . . . . . . . 6-22
Assembly 8: Transfer Assembly. . . . . . . . . . . . . . . . . . . 6-26
Assembly 9: Option - Second Paper Drawer . . . . . . . . . 6-28
Assembly 10: Options . . . . . . . . . . . . . . . . . . . . . . . . . . 6-34
Assembly 11: Miscellaneous . . . . . . . . . . . . . . . . . . . . . 6-35
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . X-1
v
4026-0XX
Notices and Safety Information
Laser Notice
The printer is certified in the U.S. to conform to the requirements of
DHHS 21 CFR Subchapter J for Class I (1) laser products, and
elsewhere is certified as a Class I laser product conforming to the
requirements of IEC 825.
Class I laser products are not considered to be hazardous. The

printer contains internally a Class IIIb (3b) laser that is nominally a 5
milliwatt gallium arsenide laser operating in the wavelength region of
770-795 nanometers. The laser system and printer are designed so
there is never any human access to laser radiation above a Class I
level during normal operation, user maintenance, or prescribed
service condition.
vi Service Manual
4026-0XX
Laser product labels are located on the back of the printer and on
the printhead.
CLASS 1 LASER PRODUCT

LASER KLASSE1 NACH IEC825
LUOKAN 1 LASERLAITE
APPAREIL A LASER DE CLASSE1
TO IEC 825
Notices and Safety Information vii

4026-0XX
viii Service Manual

4026-0XX
Laser
Der Drucker erfüllt gemäß amtlicher Bestätigung der USA die
Anforderungen der Bestimmung DHHS (Department of Health and
Human Services) 21 CFR Teil J für Laserprodukte der Klasse I (1).
In anderen Ländern gilt der Drucker als Laserprodukt der Klasse I,
der die Anforderungen der IEC (International Electrotechnical
Commission) 825 gemäß amtlicher Bestätigung erfüllt.
Laserprodukte der Klasse I gelten als unschädlich. Im Inneren des

Druckers befindet sich ein Laser der Klasse IIIb (3b), bei dem es
sich um einen Galliumarsenlaser mit 5 Milliwatt handelt, der Wellen
der Länge 770-795 Nanometer ausstrahlt. Das Lasersystem und der
Drucker sind so konzipiert, daß im Normalbetrieb, bei der Wartung
durch den Benutzer oder bei ordnungsgemäßer Wartung durch den
Kundendienst Laserbestrahlung, die die Klasse I übersteigen würde,
Menschen keinesfalls erreicht.
Avis relatif à l’utilisation de laser

Pour les Etats-Unis : cette imprimante est certifiée conforme aux
provisions DHHS 21 CFR alinéa J concernant les produits laser de
Classe I (1). Pour les autres pays : cette imprimante répond aux
normes IEC 825 relatives aux produits laser de Classe I.
Les produits laser de Classe I sont considérés comme des produits

non dangereux. Cette imprimante est équipée d’un laser de Classe
IIIb (3b) (arséniure de gallium d’une puissance nominale de 5
milliwatts) émettant sur des longueurs d’onde comprises entre 770
et 795 nanomètres. L’imprimante et son système laser sont conçus
pour impossible, dans des conditions normales d’utilisation,
d’entretien par l’utilisateur ou de révision, l’exposition à des
rayonnements laser supérieurs à des rayonnements de Classe I .
Notices and Safety Information ix

4026-0XX
Avvertenze sui prodotti laser

Questa stampante è certificata negli Stati Uniti per essere conforme
ai requisiti del DHHS 21 CFR Sottocapitolo J per i prodotti laser di
classe 1 ed è certificata negli altri Paesi come prodotto laser di
classe 1 conforme ai requisiti della norma CEI 825.
I prodotti laser di classe non sono considerati pericolosi. La

stampante contiene al suo interno un laser di classe IIIb (3b)
all’arseniuro di gallio della potenza di 5mW che opera sulla
lunghezza d’onda compresa tra 770 e 795 nanometri. Il sistema
laser e la stampante sono stati progettati in modo tale che le
persone a contatto con la stampante, durante il normale
funzionamento, le operazioni di servizio o quelle di assistenza
tecnica, non ricevano radiazioni laser superiori al livello della classe
1..
Avisos sobre el láser

Se certifica que, en los EE.UU., esta impresora cumple los
requisitos para los productos láser de Clase I (1) establecidos en el
subcapítulo J de la norma CFR 21 del DHHS (Departamento de
Sanidad y Servicios) y, en los demás países, reúne todas las
condiciones expuestas en la norma IEC 825 para productos láser de
Clase I (1).
Los productos láser de Clase I no se consideran peligrosos. La

impresora contiene en su interior un láser de Clase IIIb (3b) de
arseniuro de galio de funcionamiento nominal a 5 milivatios en una
longitud de onda de 770 a 795 nanómetros. El sistema láser y la
impresora están diseñados de forma que ninguna persona pueda
verse afectada por ningún tipo de radiación láser superior al nivel de
la Clase I durante su uso normal, el mantenimiento realizado por el
usuario o cualquier otra situación de servicio técnico.
x Service Manual
4026-0XX
Declaração sobre Laser

A impressora está certificada nos E.U.A. em conformidade com os
requisitos da regulamentação DHHS 21 CFR Subcapítulo J para a
Classe I (1) de produtos laser. Em outros locais, está certificada
como um produto laser da Classe I, em conformidade com os
requisitos da norma IEC 825.
Os produtos laser da Classe I não são considerados perigosos.

Internamente, a impressora contém um produto laser da Classe IIIb
(3b), designado laser de arseneto de potássio, de 5 milliwatts
,operando numa faixa de comprimento de onda entre 770 e 795
nanómetros. O sistema e a impressora laser foram concebidos de
forma a nunca existir qualquer possiblidade de acesso humano a
radiação laser superior a um nível de Classe I durante a operação
normal, a manutenção feita pelo utilizador ou condições de
assistência prescritas.
Laserinformatie
De printer voldoet aan de eisen die gesteld worden aan een
laserprodukt van klasse I. Voor de Verenigde Staten zijn deze eisen
vastgelegd in DHHS 21 CFR Subchapter J, voor andere landen in
IEC 825.
Laserprodukten van klasse I worden niet als ongevaarlijk

aangemerkt. De printer is voorzien van een laser van klasse IIIb
(3b), dat wil zeggen een gallium arsenide-laser van 5 milliwatt met
een golflengte van 770-795 nanometer. Het lasergedeelte en de
printer zijn zo ontworpen dat bij normaal gebruik, bij onderhoud of
reparatie conform de voorschriften, nooit blootstelling mogelijk is
aan laserstraling boven een niveau zoals voorgeschreven is voor
klasse 1.
Notices and Safety Information xi

4026-0XX
Lasermeddelelse
Printeren er godkendt som et Klasse I-laserprodukt, i
overenstemmelse med kravene i IEC 825.
Klasse I-laserprodukter betragtes ikke som farlige. Printeren

indeholder internt en Klasse IIIB (3b)-laser, der nominelt er en 5
milliwatt galliumarsenid laser, som arbejder på bølgelængdeområdet
770-795 nanometer. Lasersystemet og printeren er udformet
således, at mennesker aldrig udsættes for en laserstråling over
Klasse I-niveau ved normal drift, brugervedligeholdelse eller
obligatoriske servicebetingelser.
Huomautus laserlaitteesta
Tämä kirjoitin on Yhdysvalloissa luokan I (1) laserlaitteiden DHHS
21 CFR Subchapter J -määrityksen mukainen ja muualla luokan I
laserlaitteiden IEC 825 -määrityksen mukainen.
Luokan I laserlaitteiden ei katsota olevan vaarallisia käyttäjälle.

Kirjoittimessa on sisäinen luokan IIIb (3b) 5 milliwatin
galliumarsenidilaser, joka toimii aaltoalueella 770 - 795 nanometriä.
Laserjärjestelmä ja kirjoitin on suunniteltu siten, että käyttäjä ei
altistu luokan I määrityksiä voimakkaammalle säteilylle kirjoittimen
normaalin toiminnan, käyttäjän tekemien huoltotoimien tai muiden
huoltotoimien yhteydessä.
VARO! Avattaessa ja suojalukitus ohitettaessa olet alttiina

näkymättömälle lasersäteilylle. Älä katso säteeseen.
VARNING! Osynlig laserstrålning när denna del är öppnad och

spärren är urkopplad. Betrakta ej strålen.
xii Service Manual

4026-0XX
Laser-notis
Denna skrivare är i USA certifierad att motsvara kraven i DHHS 21
CFR, underparagraf J för laserprodukter av Klass I (1). I andra
länder uppfyller skrivaren kraven för laserprodukter av Klass I enligt
kraven i IEC 825.
Laserprodukter i Klass I anses ej hälsovådliga. Skrivaren har en

inbyggd laser av Klass IIIb (3b) som består av en laserenhet av
gallium-arsenid på 5 milliwatt som arbetar i våglängdsområdet 770-
795 nanometer. Lasersystemet och skrivaren är utformade så att det
aldrig finns risk för att någon person utsätts för laserstrålning över
Klass I-nivå vid normal användning, underhåll som utförs av
användaren eller annan föreskriven serviceåtgärd.
Laser-melding
Skriveren er godkjent i USA etter kravene i DHHS 21 CFR,
underkapittel J, for klasse I (1) laserprodukter, og er i andre land
godkjent som et Klasse I-laserprodukt i samsvar med kravene i IEC
825.
Klasse I-laserprodukter er ikke å betrakte som farlige. Skriveren

inneholder internt en klasse IIIb (3b)-laser, som består av en
gallium-arsenlaserenhet som avgir stråling i bølgelengdeområdet
770-795 nanometer. Lasersystemet og skriveren er utformet slik at
personer aldri utsettes for laserstråling ut over klasse I-nivå under
vanlig bruk, vedlikehold som utføres av brukeren, eller foreskrevne
serviceoperasjoner.
Notices and Safety Information xiii

4026-0XX
Avís sobre el Làser

Segons ha estat certificat als Estats Units, aquesta impressora
compleix els requisits de DHHS 21 CFR, apartat J, pels productes
làser de classe I (1), i segons ha estat certificat en altres llocs, és un
producte làser de classe I que compleix els requisits d’IEC 825.
Els productes làser de classe I no es consideren perillosos. Aquesta

impressora conté un làser de classe IIIb (3b) d’arseniür de gal.li,
nominalment de 5 mil.liwats, i funciona a la regió de longitud d’ona
de 770-795 nanòmetres. El sistema làser i la impressora han sigut
concebuts de manera que mai hi hagi exposició a la radiació làser
per sobre d’un nivell de classe I durant una operació normal, durant
les tasques de manteniment d’usuari ni durant els serveis que
satisfacin les condicions prescrites.
xiv Service Manual

4026-0XX
Japanese Laser Notice
Chinese Laser Notice
Notices and Safety Information xv

4026-0XX
Korean Laser Notice
Safety Information
• The maintenance information for this product has been prepared
for use by a professional service person and is not intended to
be used by others.
• There may be an increased risk of electric shock and personal
injury during disassembly and servicing of this product.
Professional service personnel should understand this and take
necessary precautions.
• The safety features of some parts may not always be obvious.
Therefore, replacement parts must have the identical or
equivalent characteristics as the original parts.
Sicherheitshinweise
• Die Wartungsinformationen für dieses Produkt sind
ausschließlich für die Verwendung durch einen
Wartungsfachmann bestimmt.
xvi Service Manual

4026-0XX
• Während des Auseinandernehmens und der Wartung des

Geräts besteht ein zusätzliches Risiko eines elektrischen
Schlags und körperlicher Verletzung. Das zuständige
Fachpersonal sollte entsprechende Vorsichtsmaßnahmen
treffen.
• Ersatzteile müssen gleiche oder gleichwertige Merkmale wie die
Originalteile aufweisen, da nicht immer offensichtlich ist, welche
Teile des Geräts Sicherheitsmerkmale aufweisen.
Consignes de Sécurité
• Les consignes d'entretien et de réparation de ce produit
s'adressent uniquement à un personnel de maintenance
qualifié.
• Le démontage et l'entretien de ce produit pouvant présenter
certains risques électriques, le personnel d'entretien qualifié
devra prendre toutes les précautions nécessaires.
• Les normes de sécurité de certaines pièces n'étant pas toujours
explicites, les pièces de rechange doivent être identiques ou
conformes aux caractéristiques des pièces d'origine.
Norme di sicurezza
• Le informazioni riguardanti la manutenzione di questo prodotto
sono indirizzate soltanto al personale di assistenza autorizzato.
• Durante lo smontaggio e la manutenzione di questo prodotto, il
rischio di subire scosse elettriche e danni alla persona è più
elevato. Il personale di assistenza autorizzato, deve, quindi,
adottare le precauzioni necessarie.
• Poiché non tutti i pezzi di ricambio garantiscono la stessa
sicurezza, questi devono avere caratteristiche identiche o
equivalenti a quelle dei pezzi originali.
Pautas de Seguridad
• La información sobre el mantenimiento de este producto está
dirigida exclusivamente al personal cualificado de
mantenimiento.
• Existe mayor riesgo de descarga eléctrica y de daños
Notices and Safety Information xvii

4026-0XX
personales durante el desmontaje y la reparación de la

máquina. El personal cualificado debe ser consciente de este
peligro y tomar las precauciones necesarias.
• Los dispositivos de seguridad de algunas piezas no siempre
pueden reconocerse a simple vista. Por lo tanto, los recambios
deben poseer características idénticas o equivalentes a las de
las piezas originales.
Informações de Segurança
• As informações de segurança relativas a este produto destinam-
se a profissionais destes serviços e não devem ser utilizadas
por outras pessoas.
• Risco de choques eléctricos e ferimentos graves durante a
desmontagem e manutenção deste produto. Os profissionais
destes serviços devem estar avisados deste facto e tomar os
cuidados necessários.
• Os dispositivos de segurança de algumas peças poderão não
ser sempre suficientemente evidentes. Assim, as peças
sobressalentes devem possuir características idênticas ou
equivalentes às peças originais.
Informació de Seguretat
• La informació pel manteniment d’aquest producte està orientada
exclusivament a professionals i no està destinada a ningú que
no ho sigui.
• El risc de xoc elèctric i de danys personals pot augmentar durant
el procés de desmuntatge i de servei d’aquest producte. El
personal professional ha d’estar-ne assabentat i prendre les
mesures convenients.
• Les característiques de seguretat d’algunes de les peces poden
no ser òbvies. Per tant, les característiques dels recanvis hauran
de ser idèntiques o equivalents a les de les peces originals.
xviii Service Manual

4026-0XX
Chinese Safety Information
Korean Safety Information
Ozone Information
This product does not produce measurable amounts of ozone gas.
Notices and Safety Information xix

4026-0XX
Preface
This manual is divided into the following chapters:
• “General Information” contains a general description of the

printer, options, and the maintenance approach used to repair it.
General environmental and safety instructions as well as special
tools and test equipment are listed in this chapter.
• “Diagnostic Information” contains error code table, symptom
table, and service checks used to isolate failing field replaceable
units (FRUs).
• “Diagnostic Aids” contains tests and checks used to locate or
repeat symptoms of printer problems.
• “Repair Information” provides instructions for making printer
adjustments and removing and installing FRUs.
• “Connector Locations” uses illustrations to identify the major
components and test points on the printer.
• “Parts Catalog” contains illustrations and part numbers for
individual FRUs.
xx Service Manual
4026-0XX
1. General Information
This printer is a letter-quality page printer designed to attach to an

IBM Personal Computer or other computers compatible with the IBM
Personal Computer (with 386 processor or higher).
The printer is available in models 4026-06A, 06C, 06D, and 06J

without Flash memory and models 4026-06B and 06F with Flash
memory. Model upgrade is not available.
The printer can print in various pitches and has bit image graphics
capability, allowing the user to print advanced graphics. Model
4026-06D has PostScript Level 2 emulation.
The model 4026-070 printer includes a manual input guide,

additional memory and font selections. The 4026-071 is a label
printing model which also includes a manual input guide, additional
memory and font selections.
Options
Memory upgrade options are 1MB, 2MB, and 4MB. The paper tray
option is a 250 sheet secondary paper tray. Contact your point of
purchase for options available in your country.
Maintenance Approach
The diagnostic information in this manual leads you to the correct
field replaceable unit (FRU) or part. Use the error code charts,
symptom index, service checks, and diagnostic aids to determine
the symptom and repair the failure. After you complete the repair,
perform tests as needed to verify the repair.
Tools Required For Service

Magnetic Phillips Screwdriver
General Information 1-1

4026-0XX
Acronyms
CSU Customer Setup
DRAM Dynamic Random Access Memory
EP Electrophotographic Process
EPROM Erasable, Programmable Read-Only
Memory
ESD Electrostatic Discharge
FRU Field Replaceable Unit
HVPS High Voltage Power Supply
LASER Light Amplification by Stimulated Emission
of Radiation
LCD Liquid Crystal Display
LED Light-Emitting Diode
LVPS Low Voltage Power Supply
MROM Masked Read Only Memory
NVRAM Nonvolatile Random Access Memory
OEM Original Equipment Manufacturer
PC Photoconductor
POST Power-On Self Test
ROM Read Only Memory
SIMM Single In-Line Memory Module
SRAM Static Random Access Memory
UPR Used Parts Return
V ac Volts alternating current
V dc Volts direct current
1-2
4026-0XX
2. Diagnostic Information
Start
CAUTION: NEVER manually actuate or disable the top cover
interlock switch and the printhead shutter actuator at the same
time. To perform some of the service checks and tests, such as
troubleshooting paper feed problems, you need to actuate the top
cover interlock switch with the covers opened or removed and power
applied to the machine. It is important for personal safety that you
DO NOT, FOR ANY REASON, disable the printhead shutter actuator
when power is on.
Remove power from the printer before you connect or disconnect

any cable or electronic board or assembly for personal safety and to
prevent damage to the printer.
Use the service error code, user error message, symptom table,
service checks, and diagnostic aids in this chapter to determine the
corrective action necessary to repair a malfunctioning printer.
The lights on the operator panel can indicate either a user error
message or service error message. When a service error occurs the
printer stops printing and all operator panel LEDs blink in a
continuous pattern, indicating a service error, until the printer is
powered off. If all operator panel LEDs are blinking, go to the
“Service Error Codes” on page 2-2.
When a user error message occurs, one or two operator panel LEDs
are on solid or blinking. Go to the “User Error Message Table” on
page 2-6.
If your machine does not have a service error code and does not
complete POST, go to the “POST Symptom Table” on page 2-12. If
your machine completes POST without an error, and you have a
symptom, go to the “Symptom Table” on page 2-13. Locate your
symptom and take the appropriate action.
If a service error code appears while you are working on the

machine, go to the “Service Error Codes” on page 2-2 and take the
indicated action for that error.
Diagnostic Information 2-1

4026-0XX
Service Error Codes

When a service error occurs the printer stops printing and all
operator panel LEDs blink in a continuous pattern, indicating a
service error, until the printer is powered off.
Press and release the operator panel button to display the service
error code. Locate the blinking LEDs in the following table and take
the indicated action.
Blinking Operator Panel LED Action
Software Service Error Code Run the Printer Diagnostic Test to

diagnose between the ROM SIMM
and the controller board. If no other
error code displays after the test
completes, replace the controller
board.
Fuser Failure Error Go to the “Cold Fuser Service

Check” on page 2-18.
Mirror Motor Error The Polygon Mirror Motor is not

rotating during printing. Replace the
engine board. If this does not correct
the problem, replace the printhead
assembly.
Laser Diode Failure Replace the printhead assembly. If

this does not correct the problem,
replace the engine board.
2-2
4026-0XX
Controller Card Failure Replace Controller board
Optional Memory Error Replace the optional memory SIMM.

If this does not correct the problem,
replace the controller board.
Fan Failure Error Go to the “Fan Service Check” on

page 2-17.
ROM Checksum Error Replace the ROM SIMM. If this does

not correct the problem, replace the
controller board.
Base Memory Error Replace Controller board

4026-0XX
NVRAM Failure Error Replace Controller board
ASIC Register Failure Error Replace Controller board
ASIC SRAM Failure Error Replace Controller board
Flash Memory Failure Error Replace the ROM SIMM w/Flash. If

this does not correct the problem,
Font Checksum Failure Error Replace the ROM SIMM. If this does
not correct the problem, replace the
controller board.
2-4
4026-0XX
Engine Board Communications Replace the engine board. If this

Failure Error does not correct the problem,
Controller SRAM Failure Error Replace Controller board

4026-0XX
User Error Message Table

When a user error message occurs the printer stops printing and
one or two operator panel LEDs are on solid or blinking until the
printer is powered off. Locate the printer’s LED Status in the
following table and take the indicated action.
User Error Message LED Status Action
Paper Jam Paper Jam on solid Open cover and clear

any paper jams. Close
the top cover. If the
error message is still
present, go to the
“Paper Feed Service
Load Manual Paper/ Load Paper blinks and Load media into the
Envelope Press Button on solid manual slot and push
the operator panel
button to resume
printing or do a front
panel reset by press-
ing and holding the
operator panel button
for more than three
seconds.
Load Paper/Load Load Paper on solid Load media in the

Envelope and Press Button on appropriate paper
solid tray and push the
to resume printing or
do a front panel reset
by pressing and hold-
ing the operator panel
button for more than
three seconds.
Top Cover Open Error on solid Close the top cover. If

the error LED remains
on solid and POST
does not continue, go
to the “Cover Inter-
lock Service Check”
on page 2-16
2-6
4026-0XX
Memory Full/Com- Error on solid and The printer memory

plex Page/Resolution Press Button on solid is full or the page is
Reduction Warning/ too complex to print.
Data Transmission The printer is forced to
Error reduce the resolution
of a formatted page
to 300 dpi before
printing, or the printer
is unable to maintain
the required data
transfer rate. Go to the
“User Secondary
Error Message Table”
on page 2-8.
Flash Memory Full Error blinks and This condition only

Press Button on solid occurs when the
Flash SIMM is
installed. (4026-06B
or 4026-06F) Go to
the “User Secondary
Error Message Table”
on page 2-8.

4026-0XX
User Secondary Error Message Table

Press and release the operator panel button two times to display the
user secondary error LED status. Each press and release action
must be performed within a half second. Locate the printer’s LED
status in the following table and take the indicated action.
Complex Page Ready, Error, and Switch the printing

Press Button on solid mode to a different
printing mode using
the Lexmark driver for
Windows, or push the
to resume printing, or
three seconds.
Memory Full Ready, Data, Error, Change the printing

and Press Button on mode to Quick Print
solid Plus or reduce the
complexity of the job
or the resolution, or
push the operator
panel button to
resume printing, or
three seconds.
2-8
4026-0XX
Resolution Reduction Ready, Data blinking Switch from the GL/2

and the Error, Press or raster mode to
Button on solid Quick Print Plus mode
using the Lexmark
driver for Windows, or
press the operator
panel button to
resume printing, or
ing the operator but-
ton for more than
three seconds.
Data Transmission Data, Error, and Press Switch to Print Accel-

Error Button on solid erator using the Lex-
mark driver for
Windows if 2MB of
memory or more is
installed, or switch to
the GL/2 printing
mode using the Lex-
mark driver for Win-
dows, or push the
to resume printing, or
three seconds.
Flash Memory Full Error blinking and This condition only

Press Button on solid occurs when the
Flash memory is full.

4026-0XX
Power-On Self Test (POST)

When you turn the printer on, it performs a Power-On Self Test.
Check for correct POST functioning by observing the following:
1. All LEDs come on solid.

2. The fan turns on for 2 seconds.
3. All the LEDs turn off.
4. The engine board checks the status of the cover interlock
switch.
5. The LEDs begin to turn on then off sequentially.
6. The fan turns off.
7. The engine board checks the status of the paper exit sensor.
8. The engine board checks the status of the thermistor.
9. The fuser lamp turns on.
Note: The printer may be idle for up to 40 seconds as the fuser

warms to operating temperature. Printer idle time is shorter if
the fuser is already warm.
10. The polygon motor (printhead motor) turns on.

11. The main motor turns on.
12. The paper feed gears turn.
13. The print cartridge drive gear engages.
14. The paper feed take-up shaft and D-roll assembly rotates to
home position. (The paper feed lift plate assembly is in the
down position).
16. Models 4026-06A, 06C, 06D and 06J, 070 and 071 - The Ready
LED turns on solid and the Data LED blinks. Go to Step 17.
Models 4026-06B and 06F - The Ready LED turns on solid and
the Data LED blinks.
• The controller board checks flash ROM installation.
• The controller board verifies that flash is formatted.
• The controller board attempts to format flash if unformatted.
• The Data LED blinks during format.
• The printer continues POST after format is complete.
• If format fails, a “Flash Memory Failure” error displays.
17. The main drive motor turns off.
2-10
4026-0XX
18. The polygon motor (printhead motor) turns off.

19. The Data LED turns off.
20. The Ready LED stays on solid.
If your printer did not successfully complete POST, locate the

symptom in the “POST Symptom Table” on page 2-12 and take the
appropriate action.
If the printer completes all these steps and no error indications are
displayed, the printer has successfully completed the POST. If the
printer has completed POST without an error and a symptom exists,
go to the “Symptom Table” on page 2-13.

4026-0XX
POST Symptom Table
Symptom Action
POST completes except one or Go to the “Operator Panel Service

more LEDs do not come on. Check” on page 2-27.
None of the LEDs come on. Go to the “Operator Panel Service

The printer is dead (No LEDs Go to the “Low Voltage Power Sup-
come on, no motor turns) ply Service Check” on page 2-22.
The fan does not come on. Go to the “Fan Service Check” on
page 2-17
The fuser lamp does not come on. Go to the “Cold Fuser Service
The polygon motor does not come Replace the printhead assembly. If
on. this does not fix the problem, replace
the engine board.
The main drive motor does not Go to the “Main Drive Motor Service
come on. Check” on page 2-25.
The paper feed gears do not turn. Go to the “Paper Feed Service
The paper feed solenoid picks Go to the “Paper Feed Service

and tries to feed paper. Check” on page 2-34.
The toner/print cartridge gears Go to the “Main Drive Motor Service

do not turn. Check” on page 2-25.
2-12
4026-0XX
Symptom Table
Locate your symptom in the following table and take the appropriate
action
Symptom Action
Dead printer Go to the “Low Voltage Power Sup-

ply Service Check” on page 2-22.
Fan not working Go to the “Fan Service Check” on

page 2-17.
Fan noisy Go to the “Fan Service Check” on

page 2-17
Fuser parts melted Go to the “Cold Fuser Service

Fuser Lamp doesn’t light Go to the “Cold Fuser Service

Toner not fused to the paper Go to the “Cold Fuser Service

Blank page Go to the “Print Quality Service

Black page Go to the “Print Quality Service

High or heavy background Go to the “Print Quality Service

Offset print (image around char- Go to the “Print Quality Service

acters) Check” on page 2-38.
Poor image (characters washed Go to the “Print Quality Service

out) Check” on page 2-38.
Paper jams Go to the “Paper Feed Service

Main Drive Motor noisy Go to the “Main Drive Motor Service

Main Drive Motor does not move Go to the “Main Drive Motor Service
Main Drive Motor runs backward Replace the Engine board.

4026-0XX
Symptom Action
Paper is not picked or never Go to the “Paper Feed Frame

leaves the primary tray Assembly Service Check” on
page 2-37.
Paper is not picked or never Go to the “Optional Paper Tray Two

leaves the optional paper tray Service Check” on page 2-28.
(Tray 2)
Paper feeds continuously Go to the “Paper Feed Service

Paper fails to exit printer or stack Go to the “Paper Feed Service

in output bin Check” on page 2-34.
Paper skew Go to the “Paper Feed Service

Toner on the back of the page Go to the “Transfer Assembly Ser-

vice Check” on page 2-44.
Poor print quality Go to the “Print Quality Service

Incorrect characters print Go to the “Print Quality Service

Printer not communicating with Go to the “Parallel Port Service

host Check” on page 2-34.
White or black lines or bands Go to the “Print Quality Service

Paper wrinkled or bent Go to the “Paper Feed Service

Top cover will not close Go to the “Cover Interlock Service

Light print Go to the “Print Quality Service

Check” on page 2-38
2-14
4026-0XX
Service Checks
Charge Brush Service Check
Note: The charge brush charges the photoconductor and is located
inside the photoconductor unit.
FRU Action
1 Photoconduc- Spots and marks can be caused by a defective

tor Unit charge brush inside the photoconductor unit.
If there are any spots or marks, especially ones
that appear in the same spot on the printed
page, replace the photoconductor unit.
Check the photoconductor unit for a damaged

charge brush contact.
2 Main Drive Be sure the main drive motor and gears are
Motor Gears operating correctly and turning the charge
brush.
3 Charge Check the charge brush bias contact located on

Brush Bias the right side frame for damage, corrosion, wear
Contact (right or pitting. Intermittent failure of the charge brush
side frame) contact can cause an all black page, horizontal
black bars or lines. If any of these are found,
replace the charge brush bias contact.
4 Photoconduc- Check the photoconductor unit ground contact

tor Unit on the right side frame for damage. Intermittent
Ground Con- failure of the photoconductor unit ground contact
tact can cause print quality problems such as an all
black page, horizontal black bars or lines. If any
of these are found, replace the photoconductor
unit ground contact.
5 HVPS board Unplug the machine and check the HVPS for
correct mounting, pitted or discolored contacts.
If the HVPS is damaged, replace as necessary.
If no problems are found replace the photocon-
ductor unit assembly.

4026-0XX
Cover Interlock Service Check
FRU Action
1 Right Hand Check the right hand transfer bracket actuator

Transfer arm to be sure it contacts the interlock switch
Bracket actuator mounted in the LVPS.
Replace the bracket if the arm is damaged or

broken.
2 Top Cover If the interlock switch is being actuated correctly,

Interlock check the continuity of the switch between
Switch CN7A-1 and CN7A-2 on the cable as you acti-
vate the switch. If incorrect, replace the LVPS.
3 LVPS Be sure the voltage at CN7-1 measures +24 V

dc. If incorrect, turn the printer power off and
disconnect the LVPS cable from the engine
board. Turn the printer power on. The voltage on
the LVPS cable pin 1 should measure approxi-
mately +24 V dc. If incorrect, replace the LVPS.
If correct, go to the “Low Voltage Power Supply
Service Check” on page 2-22.
D-Roll Assembly Service Check
FRU Action
1 D-Roll Check the D-roll for wear, broken, or worn parts.

Replace as necessary.
2 D-Roll Clutch Be sure the clutch assembly operates correctly.

Assembly Replace as necessary.
3 Solenoid Be sure the paper feed solenoid operates cor-

rectly. If the solenoid fails to pick, go to the
“Paper Take-Up Solenoid Service Check” on
page 2-32.
4 Paper Feed Be sure the main drive/paper feed gears operate

Drive Gears correctly. Check for broken teeth or damaged
gears. Replace as necessary.
2-16
4026-0XX
Exit Sensor Service Check
FRU Action
1 Engine Board Disconnect the exit sensor cable from the

engine board. Check for +4.5 V dc to +5.5 V dc
at CN8-1. If incorrect, replace the engine board.
2 Exit Sensor Be sure the exit sensor is snapped in place and

the cable is firmly connected.
3 Exit Sensor Check the flag for damage and free movement
Flag and replace as necessary. Be sure the exit sen-
sor spring is properly installed and not discon-
nected, damaged, or missing.
Reconnect the exit sensor cable and check the

voltage at CN8-3 on the engine board as you
press the exit sensor flag. The voltage should
change as the flag is moved in and out of the
sensor. If incorrect, replace the exit sensor.
4 Exit Sensor Check the continuity of the cable. If incorrect,

Cable replace the exit sensor cable.
Fan Service Check
FRU Action
1 Engine Board Turn the printer power off. Disconnect CN11

on the engine board. Turn the printer on and
measure the voltage between CN11-1 and
CN11-2. The voltage should read approxi-
mately +24 V dc. If incorrect, replace the
engine board.
If correct, turn the printer off and connect

CN11. Monitor the voltage between ground
and CN11-1 (FAN*) immediately as you power
on the printer. The voltage should go from +24
V dc with the fan motor off to approximately 0
V dc when the motor turns on. If incorrect,
replace the fan motor and cable assembly.
2 Fan Motor/ Be sure the fan is properly installed if the fan

Cable is noisy. If correct, replace the fan motor
assembly.

4026-0XX
Cold Fuser Service Check

If all the Cold Fuser Service Check items are correct, go to the “Hot
Fuser Service Check” on page 2-20
Note: Toner buildup on the fuser input guide, paper separator, hot
roll and backup roll causes paper jams.
When toner is partially fused to the paper it is usually caused by low

fuser temperature.
Avoid handling the lamp as much as possible as it is easily broken.

Be careful not to touch the glass housing with bare hands as the skin
contains acids that can weaken the glass.
When making checks and handling the fuser lamp make sure you
allow enough time for the fuser lamp and associated parts to cool.
FRU Action
1 Line Voltage The voltage to the printer must be within the fol-
lowing limits.
100 V ac (90 V ac - 110 V ac) Japan
120 V ac (108 V ac - 132 V ac) U.S.
220/230 V ac (207 Vac - 253 V ac) W.T.
2 Fuser Lamp Turn off the printer and wait a few minutes for
the fuser lamp to cool. Turn the machine on and
observe the lamp turning on during POST. You
can see the lamp through the left rear vents of
the top cover. If the lamp lights, be sure the cor-
rect voltage lamp is installed. The voltage rating
is stamped on one of the ceramic end pieces.
2-18
4026-0XX
FRU Action
3 Thermistor If the fuser lamp comes on and a fuser failure

LED error code displays, be sure the thermistor
is contacting the hot roll and the thermistor
cable is firmly seated in connector CN2 on the
engine board.
Check for excessive toner buildup on the surface

of the thermistor. Clean or replace as necessary.
Turn the printer power off and disconnect the

thermistor cable from CN2 on the engine board.
Measure the resistance of the thermistor
between CN2-1 and CN2-2. The resistance
should measure 250K ohms or less. If incorrect,
replace the thermistor and cable assembly. If
correct, replace the engine board.
Note: The thermistor assembly is fragile. Use

care when handling to avoid damage.
4 Fuser Lamp If the fuser lamp does not come on and a fuser
Cable failure LED error code displays, unplug the
printer power cord and check the continuity
between the fuser cable contacts in the lower
fuser cover. If incorrect, check the continuity of
the fuser lamp, thermal fuse and terminals.
Repair or replace as necessary. If correct, check
the continuity of the fuser lamp cable. If incor-
rect, replace the cable. If correct, replace the fol-
lowing FRUs one at a time in the order shown:
Engine Board
LVPS
If the lamp does not come on and the Error LED

is on solid, go to the “Fan Service Check” on
page 2-17
5 Fuser Ther- Check the fuser thermostat if the fuser lamp

mostat (4026- does not come on or if it comes on and does not
06C and 06F) go off. Unplug the printer power cord and check
the thermostat to be sure that it opens and
closes properly. Replace as necessary.

4026-0XX
Hot Fuser Service Check

Note: If you replace the fuser assembly for overheating, also
replace the engine board.
CAUTION: FUSER PARTS MAY BE HOT.
FRU Action
1 Fuser Assem- Check for melted or damaged hot roll bearings,

bly drive gear, paper separators, thermistor, hot roll,
backup roll or frame parts. If the fuser assembly
shows evidence of overheating or thermal dam-
age, repair as necessary.
Note: If the lower fuser frame is damaged,

replace the complete assembly.
2 Engine Board Replace the engine board if the fuser continues

to operate erratic or overheats.
Input Sensor Service Check

If the paper never leaves the tray or fails to be picked from the tray,
go to the “Paper Feed Service Check” on page 2-34.
FRU Action
1 Paper Check the paper for rough edges, creases,

tears, or folds.
Be sure the paper leaves the paper tray as soon

as it is picked by the D-Roll. If it does not, go to
the “Paper Feed Service Check” on page 2-34.
2 Envelopes (if Be sure no more than 10 envelopes are stacked

being used) in the input paper tray. They may not pick or may
jam at the input sensor or paper separator.
Note: Coated papers, synthetic papers, multi-sheet

forms, thermal papers, envelopes with windows,
holes, cutouts, perforations, string-ties, metal
fasteners, exposed flap adhesive, excessive curl, bent
corners and some labels cause problems.
2-20
4026-0XX
FRU Action
3 Input Sensor Check the flag for damage, especially at the

Flag front edge, Be sure the flag moves freely.
Replace the flag as necessary.
4 Input Sensor Be sure the input sensor is correctly installed

and the sensor/solenoid cable is properly con-
nected.
Disconnect the input sensor cable from the CN3

connector on the engine board. The voltage at
CN3-1 measures between +4.5 V dc and +5.5 V
dc. If incorrect, replace the engine board.
If correct, reconnect the input sensor cable at

CN3. Monitor the voltage at CN3-3 while moving
the sensor flag in and out. The voltage changes
from +2 V dc to 0 V dc. If incorrect, check the
input sensor/solenoid cable continuity. If cable
continuity is incorrect, replace the paper feed
frame assembly. If cable continuity is correct,
replace the following FRUs one at a time in the
order shown:
Input Sensor
Engine Board

4026-0XX
Low Voltage Power Supply Service Check

Note: The controller board, HVPS and printhead assembly receive
power from the LVPS through the engine board.
If the machine is dead, be sure the controller board is correctly

seated in the engine board connector.
Check and reseat all cables.
Dead Printer
FRU Action
1 Line Voltage Check the AC line voltage. The voltages should

be within the following limits:
100 V ac (90 V ac - 110 V ac) Japan
120 V ac (108 V ac - 132 V ac) U.S.
220/230 V ac (207 V ac - 253 V ac) W.T.
2 LVPS The voltage measures approximately +5 V dc

between CN7-4 and ground on the engine
board. If incorrect, disconnect CN7 on the
engine board and measure the voltage between
CN7-4 (+5 V dc) and CN7-3 (+5 V ground). The
reading should measure approximately +5 V dc.
If +5 V dc is not present, unplug the printer line

cord and check fuse F1. If the fuse is open,
replace the fuse. If the fuse is not open, replace
the LVPS.
3 Engine Board If +5 V dc is present when CN7 is disconnected

then disconnect CN2, CN4, CN5, CN9 and
CN10 from the engine board. Also disconnect
the controller board and remove the ROM SIMM
and any optional memory SIMMs. Reconnect
CN7 and check for +5 V dc. If incorrect, replace
the engine board.
4 Controller Reinstall the controller board. Check for +5 V dc

Board at CN7-4. If incorrect, replace the controller
board.
2-22
4026-0XX
FRU Action
5 ROM SIMM Reinstall the ROM SIMM. Check for +5 V dc at

and Optional CN7-4. If incorrect, replace the ROM SIMM.
Memory
SIMM Reinstall the optional memory SIMM if one was
installed. Check for +5 V dc at CN7-4. If incor-
rect, replace the optional memory SIMM.
6 HVPS Reconnect CN4 and check for +5 V dc at CN7-

4. If incorrect, replace the HVPS.
7 Printhead Reconnect CN5 and CN10. Check for +5 V dc at

Assembly CN7-4. If incorrect, replace the printhead
assembly.
8 Thermistor Reconnect CN2 and check for +5 V dc at CN7-

4. If incorrect, replace the thermistor/cable
assembly.
Post Incomplete - ERROR LED remains on solid
Note: Be sure the top cover is closed when doing the following
checks.
FRU Action
1 LVPS Disconnect the LVPS cable from the engine

board. The voltage measures approximately +24
V dc between pin 1 (+24 V dc) and pin 2 (+24 V
dc ground). If incorrect, replace the LVPS.
2 Engine Board Reconnect the LVPS cable and measure the

voltage on CN7-1. The reading should measure
approximately +24 V dc. If incorrect, disconnect
CN3, CN4, CN6, CN9, CN10 and CN11 from the
engine board. The voltage on CN7-1 measures
+24 V dc. If incorrect, replace the engine board.
If correct, reconnect one cable at a time check-
ing the voltage at CN7-1 until the FRU causing
the problem is found. Replace the failing FRU.
If the CN3 or CN9 are causing the problem, it is

necessary to disconnect each solenoid and
check the voltage at CN7-1. Replace the failing
FRU.

4026-0XX
Fuse F1 continues to open after being replaced
FRU Action
1 Fuse F1 If fuse F1 continues to open after being

replaced, disconnect CN7 from the engine
board and turn the printer power on. If F1 opens,
replace the LVPS.
If F1 does not open with CN7 disconnected,

check the following:
Turn the printer power off and disconnect all the

cables connected to the engine board and
remove the controller board. Reconnect each
cable and the controller board one at a time until
the FRU causing F1 to open is found. Replace
the failing FRU.
2-24
4026-0XX
Main Drive Motor Service Check
FRU Action
1 Main Drive Disconnect CN6 from the engine board. Check

Motor the motor for shorts between each pin on CN2
and the motor case. If continuity is indicated,
replace the motor.
Check the resistance between the following pins

on the cable connector. If incorrect, replace the
motor. If correct, replace the engine board.
CN2-1 to CN2-2, 8 - 10 ohms
CN2-1 to CN2-1, 8 - 10 ohms
CN2-1 to CN2-4, 8 - 10 ohms
CN2-2 to CN2-3, 8 - 10 ohms
CN2-2 to CN2-4, 8 - 10 ohms
CN2-3 to CN2-4, 8 - 10 ohms
CN2-1 to CN2-5, 3 - 5 ohms
CN2-2 to CN2-5, 3 - 5 ohms
CN2-3 to CN2-5, 3 - 5 ohms
CN2-4 to CN2-5, 3 - 5 ohms
2 Left Side Remove the toner cartridge and print cartridge.

Frame Gears Manually rotate the paper feed gears on the left
side frame assembly and check for smooth
movement with no binds. If there are binds or
the gears do not turn, repair as necessary.
3 Paper Feed Be sure the paper feed frame assembly is cor-

Frame rectly installed and the drive gear is engaging
Assembly correctly.
4 Associated Check the fuser gears, print cartridge, transfer

Gears roll gear and photoconductor unit gears to make
sure they turn freely. Repair as necessary.

4026-0XX
FRU Action
5 Motor Noise Check the motor for proper mounting, tight

mounting screws, and gear mesh. If incorrect,
repair as necessary. If correct, replace the main
drive motor.
If the motor continues to make noise after the

motor is replaced, replace the engine board.
2-26
4026-0XX
Operator Panel Service Check
FRU Action
1 Operator LEDs
Panel Assem- Be sure the operator panel cable is properly
bly seated in J5 on the controller board.
Run POST and check each LED for proper

operation.
If more than one LED does not light or an indi-

vidual LED stays on solid during POST, replace
the following FRUs one at a time in the order
shown:
Controller board
Operator panel
If all LEDs are very dim and operate erratically

during POST or all LEDs come on and stay on
solid during POST replace the following FRUs
one at a time in the order shown:
Operator panel assembly
Controller board
If none of the LEDs are on, be sure +5 V dc is

present at J1-2 on the controller board. If cor-
rect, replace the operator panel assembly. If
incorrect, replace the controller board.
If all the LEDs come on and remain on, replace

shown:
Operator Panel Assembly
Controller Board
Button Inoperative
Disconnect the operator panel cable at J5 on the
controller board. Check the continuity between
J5-5 and J5-6 on the cable as you press the but-
ton. The meter should read from approximately
10K ohms to approximately zero ohms when the
button is pressed.
If the continuity is incorrect, replace the operator

panel assembly. If correct, replace the following
FRUs one at a time in the order shown:
Operator Panel Assembly
Controller Board

4026-0XX
Optional Paper Tray Two Service Check

Check the following before servicing tray two:
• Be sure tray one is working correctly.

• Be sure the second paper tray is correctly installed and the sec-
ond paper tray connector on the base printer properly contacts
the second paper tray connector in the second paper tray.
• Be sure the second paper tray is selected in the user’s applica-
tion and no other application is on the selected port.
• Be sure the base printer and tray two connectors are not dam-
aged.
• Be sure the second paper tray drive gear in the base printer
operates correctly.
• Check the paper feed frame assembly for any obstruction or
damage in the area of the second paper tray feed slot that can
cause the paper to catch or jam.
Note: Only paper can feed from tray two. Envelopes, label sheets,
and transparencies must feed from tray one or manual feed.
Wrinkled or damaged paper
FRU Action
1 Paper Check the paper supply for wrinkled, damaged

or out of specification paper. Correct as neces-
sary.
2 Paper Path Check the paper feed lift plate assembly, paper
empty flag, paper separators, paper feed rollers
or anything in the paper path that might catch
the paper or cause the paper to wrinkle.
Paper fails to leave Paper Tray Two - Solenoid never picks
FRU Action
1 Paper Check the paper supply for any paper that may
cause a problem.
2-28
4026-0XX
FRU Action
2 Paper Lift Check the lift plate assembly, release button,

Plate Assem- button spring, release arm and all related hard-
bly ware for proper operation. Be sure the lift plate
D-roll pad mounted on the top of the lift plate is
not worn, contaminated or missing. Repair as
necessary.
3 Paper Empty Check the paper sensor flag for damage and
Sensor Flag proper operation. Repair or replace as neces-
sary.
4 Paper Empty Be sure the voltage at CN9-4 on the engine

Sensor board is between +4.5 V dc and +5.5 V dc. If
incorrect, replace the engine board. If correct,
check the voltage at CN9-6. The voltage
changes from approximately +2.00 V dc to 0 V
dc as you manually move the sensor flag in and
out of the sensor. If incorrect, be sure tray two
cable measures continuity. If incorrect, replace
the cable. If correct, replace the tray two sensor
board.
5 Second Be sure the solenoid cable is connected to the

Paper Tray paper sensor board cable and the cable is prop-
Solenoid/ erly connected to the sensor board.
Engine
Board/Sole- Disconnect CN9 at the engine board. The volt-
noid Cable/ age measures approximately +24 V dc at
Tray Two CN9-1. If incorrect, replace the engine board. If
Cable correct, reconnect CN9 and measure the volt-
age again at CN9-1. If the voltage continues to
be incorrect, check the resistance of the sole-
noid at the solenoid cable connector which mea-
sures from 60 to 90 ohms. If incorrect, replace
the tray two solenoid. If correct, be sure the
solenoid to sensor board cable measures conti-
nuity. If incorrect, replace the sensor board and
cable assembly. If correct, be sure the tray two
to engine board cable measures continuity. If
incorrect, replace the cable. If correct, replace
the tray two sensor board.

4026-0XX
Paper Tray Two feeds paper. - Paper does not reach the input
sensor in the base printer.
FRU Action
1 Second Be sure the second paper tray drive assembly

Paper Tray operates properly by manually feeding paper
Gear Assem- through the second paper tray. Repair as neces-
bly sary.
2 Second Be sure the D-roll assembly operates properly.

Paper Tray Repair as necessary.
D-Roll
3 Second Be sure the D-roll clutch assembly operates

Paper Tray properly. Repair as necessary.
D-Roll Clutch
Assembly
4 Paper Feed Be sure the paper feed gear, shaft and roller
Shaft, Gear operate properly. Repair as necessary.
and Roller
5 Paper Feed Be sure the paper feed roller, holder and spring
Roller, that is mounted on the tray two base frame oper-
Holder and ates properly. Repair as necessary.
Spring
Assembly
6 Base Printer Be sure there is no obstruction or damage at the

Paper Feed tray two feed slot in the bottom of the paper feed
Frame frame. Repair as necessary.
Assembly
Note: If the problem appears to be with the base
printer paper feed frame, go to the “Paper Feed
Frame Assembly Service Check” on page 2-37
2-30
4026-0XX
Paper Tray Two selected in the application. Paper does not feed
from Tray Two but instead feeds from Tray One. Tray Two reset to
Tray One in printer utility.
FRU Action
1 Engine Board Be sure the voltage at CN9-8 on the engine

board measures approximately 0 V dc. If incor-
rect, turn the printer power off and measure the
resistance between ground and CN9-8. Be sure
the resistance measures 0 ohms. If incorrect, be
sure the tray two cable measures continuity. If
incorrect, replace the cable. If correct, replace
shown:
Engine Board
Tray Two Sensor Board

4026-0XX
Paper Take-Up Solenoid Service Check
FRU Action
1 Solenoid Be sure the solenoid/engine board cable is

firmly seated in connector CN3 on the engine
board.
Be sure the solenoid cable is firmly seated in the

solenoid/engine board cable connector at the
solenoid.
Check the solenoid for proper mechanical oper-

ation and that the solenoid spring is not broken,
loose, or stretched. Replace parts as necces-
sary.
Be sure the solenoid to paper lift plate ground

strap is installed correctly.
Disconnect the solenoid cable from CN3 on the

engine board. Check the resistance of the sole-
noid between CN3-5 and CN3-6 on the cable.
The resistance should measure between 60 to
90 ohms.
Check the continuity of the solenoid/engine

board cable. If the cable continuity is correct,
replace the solenoid. If the cable continuity is
incorrect, replace the paper feed frame assem-
bly.
Disconnect the solenoid from the solenoid/

engine board cable at the solenoid and check
the resistance between each pin on the solenoid
connector and the solenoid frame. If continuity is
indicated, replace the solenoid assembly.
2-32
4026-0XX
FRU Action
2 Engine Board Disconnect the solenoid/input sensor cable from

CN3 on the engine board. Check the voltage at
CN3-5. The voltage should measure approxi-
mately +24 V dc. If incorrect, replace the engine
board.
If the voltage reads approximately +24 V dc,

check the voltage at CN3-6 while running a test
page. The voltage should measure 0 V dc and
read approximately 1 V dc at the time the sole-
noid should pick. If incorrect, replace the engine
board.

4026-0XX
Parallel Port Service Check

1. Do a print test to be sure the printer prints correctly.
2. Be sure the printer parallel cable is designed for bi-directional
printing.
3. Be sure the user application is set up correctly. Improper set up
can prevent establishing a communication link with the printer.
4. Be sure controller board jumper J3 is located on pins two and
three. J3 in this position causes the parallel port pull-up resis-
tors to be disabled. Some computers have open collector out-
puts which require enabling the parallel port pull-up resistors.
Do the following to enable the pull-up resistors:
Turn the printer power off.

Place J3 between pins one and two.
Turn the printer power on and run POST.
Run a print test page from the host.
5. If the printer still does not print, return J3 to the original position.
6. If the internal print test page prints correctly, the user application
and printer driver is set up correctly and the correct printer par-
allel bi-directional cable is installed. If the printer fails to print on
command from the host, replace the controller board.
Paper Feed Service Check

CAUTION: To check the paper feed it may be necessary to run the
machine with the covers removed and the top cover interlock dis-
abled. If this is necessary, NEVER disable both the top cover inter-
lock and the printhead shutter actuator at the same time.
If it is necessary to run the machine to check for paper feed

problems, open the top cover and disable the top cover interlock
switch. You can feed paper after POST has completed by running
the Normal Mode Print Test. To check some of the paper feed for
proper operation, it may be necessary to remove the toner cartridge
and photoconductor unit assemblies. Do not expose the
photoconductor unit to direct sunlight. Keep it covered. The
photoconductor will be damaged if exposed to light for any length of
time.
2-34
4026-0XX
Wrinkled Paper/Envelope/Transparency
FRU Action
1 Paper Check the paper supply for wrinkled or damaged

paper, out of specification paper, envelopes or
transparency material. Correct as necessary.
2 Paper Path Check the paper feed lift plate assembly, input
sensor actuator, paper separators, paper feed
rollers or anything in the paper path that might
catch the paper or cause the paper to wrinkle.
Paper Never Leaves The Tray or Fails To Reach The Input Sensor
Note: Remove the Optional Second Paper Tray if installed before

performing the following checks.
FRU Action
1 Paper Check the paper supply for any paper, envelope,

transparency, label, or index cards that may be
causing a problem.
2 Paper Take- Be sure the paper take-up solenoid is picking. If

Up Solenoid incorrect go to the “Paper Take-Up Solenoid
Service Check” on page 2-32.
3 Paper Frame Check the paper feed frame assembly for proper
Assembly operation. If incorrect go to the “Paper Feed
Frame Assembly Service Check” on page 2-37.
4 D-Roll Check the D-Roll assembly for proper operation.

Assembly If incorrect go to the “D-Roll Assembly Service
Check” on page 2-16
5 Paper Lift Check the paper lift plate assembly for proper
Plate Assem- operation. If incorrect, replace the paper lift plate
bly assembly.
6 Print Media Check the print media selection lever on models

Selection 06C and 06F for the correct setting. This is
Lever determined by the media being used ( labels,
card stock, paper, etc. ).
(Models 06C
and 06F)

4026-0XX
Paper Never Reaches The Exit Sensor
FRU Action
1 Input Sensor Check the input sensor for proper operation. If

incorrect, go to the “Input Sensor Service
2 D-Roll Check the D-Roll assembly for proper operation.

Assembly If incorrect go to the “D-Roll Assembly Service
3 Paper Feed Check the paper feed frame assembly. If paper

Frame is not being fed to the fuser assembly, go to the
Assembly “Paper Feed Frame Assembly Service Check”
on page 2-37.
4 Fuser Assem- Be sure the fuser assembly is free of excessive

bly toner or other contamination and is operating
correctly. Repair as necessary.
Paper Jam In The Fuser Assembly
FRU Action
1 Fuser Assem- Check the fuser assembly for excessive toner

bly build-up on the input paper guide, paper separa-
tors, hot roll, backup roll and any signs of dam-
age, overheating, or broken and damaged parts.
Repair as necessary.
2 Exit Sensor Go to the “Exit Sensor Service Check” on

page 2-17.
Any Jam After The Exit Sensor
FRU Action
1 Fuser Assem- Manually turn the fuser drive gear and be sure
bly the fuser drive assembly is working correctly. Be
sure the paper feed exit shaft and gear are also
operating properly. Repair as necessary.
2 Exit Sensor Go to the “Exit Sensor Service Check” on

page 2-17.
2-36
4026-0XX
FRU Action
3 Paper Feed Check the paper feed exit shaft, rollers, and
Exit Shaft/ gear for proper operation. Repair as necessary.
Roller
Assembly
4 Paper Feed Be sure the paper feed exit shaft ground termi-
Exit Shaft nal is properly installed.
Ground Ter-
minal Note: A poor ground contact allows static
buildup on the roller and causes paper feed
problems.
5 Top Cover Check the top cover to be sure it does not inter-
fere with the paper as it exits the fuser.
Paper Feed Frame Assembly Service Check
FRU Action
1 Paper Check the paper supply for any problems that

might prevent the paper feeding from the paper
feed lift tray.
2 Frame Check the paper feed roller shaft gear for proper
Assembly operation or damage. If incorrect, repair as nec-
essary. Check the paper feed roller assembly for
proper operation or damage. If incorrect, replace
the roller assembly.
Check the paper separators for sticking, binding,

or damage. Replace as necessary.
Check the frame for signs of damage or warped

surfaces. If incorrect, replace the frame assem-
bly.

4026-0XX
Print Quality Service Check

Before you perform the Print Quality Service Check, do the
following:
• The toner cartridge can cause a variety of print quality prob-

lems. Be sure the toner cartridge is in good condition, works
correctly, and is not low on toner. If in doubt, install a new toner
cartridge before you proceed. The printer does not have a toner
sensor. If the print is light, remove the toner cartridge and gently
shake it to evenly distribute the toner.
• Turn PQET off.
• Set the print darkness setting to normal.
• Place the printer in the 300 dpi mode.
• Be sure the printer is clean, especially around the paper path,
print cartridge, and photoconductor unit.
• Some types of paper can cause print quality problems. Print
quality problems can also be caused by extreme environmental
conditions like high temperature and humidity.
• An incorrect printer driver for the installed software can cause
problems. Incorrect characters could print and the copy may not
fit the page correctly
• Turn off PostScript on model 4026-06D before performing the
Print Quality Service Check.
FRU Action
1 Toner Car- Be sure the cartridge is installed correctly and

tridge not low on toner. Be sure the toner cartridge
drive operates correctly.
2 Photoconduc- Be sure the photoconductor unit is correctly

tor Unit installed and the cartridge drive is operating cor-
rectly.
If you have vertical marks or horizontal black

bars on the page and these marks or bars are
126 mm (4.9 inches) or 55 mm (2.2 inches)
apart, check the photoconductor unit.
3 Transfer Replace the transfer assembly if you have a hor-

Assembly izontal black bar 57 mm from the top of page.
2-38
4026-0XX
Spot or Marks At Same Spot On Every Print
Note: Do not expose the photoconductor to light any longer than

necessary when you remove the photoconductor unit from the
printer.
FRU Action
1 Photoconduc- Remove the photoconductor unit assembly and

tor Unit check the photoconductor for voids, spots, or
Assembly damage.
2 Fuser Paper If black spots are observed approximately 70

Separators mm apart, check the fuser paper separators for
toner buildup. Clean or replace as necessary.
Blank Page
FRU Action
1 Toner Car- Remove the toner cartridge and gently shake

tridge the assembly to evenly distribute the toner.
2 Printhead Be sure the printhead actuator in the top cover

actuates the printhead switch in the printhead
assembly.
3 Printhead Blank pages can be caused by a defective print-

Assembly head assembly or engine board. If the toner car-
tridge is operating correctly, replace the
printhead assembly. If this does not correct the
problem, replace the engine board.
All Black Page
Note: Incorrect laser exposure or incorrect charging of the photo-

conductor causes an all black page.
FRU Action
1 Right Side Check for a bent, broken, contaminated, or pit-

Frame Termi- ted drum charge bias terminal or drum ground
nals terminal located on the right side frame.
Replace as necessary.

4026-0XX
FRU Action
2 Cables/Con- Be sure the printhead cables to the engine

nectors board are properly seated.
3 HVPS Con- Be sure the HVPS is correctly installed. Be sure

tacts the two high voltage contacts and the ground
contact are not damaged. Repair as necessary.
4 HVPS Cover Check the HVPS cover for pitted or damaged

contacts. Replace as necessary.
5 Printhead If all the previous checks are correct, replace the

Assembly, following FRUs one at a time in the order shown:
Engine
Board, HVPS Printhead Assembly
Engine board
HVPS
White or Black Lines or Bands
Note: Poor image development, incorrect charging of the photocon-

ductor, incorrect laser exposure, poor image transfer, or poor fusing
causes white/black bands or lines.
FRU Action
1 Toner Car- Remove the toner cartridge and gently shake to

tridge evenly distribute the toner. Check the cartridge
drive gear and contacts for damage. Replace
the toner cartridge as necessary.
2 Photoconduc- Check the photoconductor unit for damage to

tor Unit the drive gear or contact. Replace as necessary.
2-40
4026-0XX
FRU Action
3 Transfer Clean the corona wire to remove any toner that

Corona has accumulated. Open the top cover and locate
Cleaning the cleaning tool. Unsnap the cleaning tool from
its holder. The corona wire is located directly in
front of the transfer unit. Hook the cleaning tool
under the transfer unit with the clear “needle’
facing you. As you slide the cleaning tool back
and forth a few times to remove any toner
buildup, you hear a clicking sound. If you do not
hear this sound, the tool is not seated correctly.
Return the cleaning tool to its mounting in the
top cover and close the cover.
4 Fuser Assem- Check the fuser for toner buildup. Be sure the
bly hot roll, backup roll, and thermistor are not dam-
aged. Repair as necessary.
5 Transfer Go to the “Transfer Assembly Service Check” on

Assembly page 2-44.
6 Printhead If all the previous checks are correct, replace the

printhead assembly.
Offset Print
FRU Action
1 Fuser Replace the lower fuser assembly.

4026-0XX
Excessive Background
Note: Poor development or poorly charged toner particles causes

excessive background. This is more noticeable as the toner car-
tridge nears end of life.
FRU Action
1 Toner Car- Be sure the toner cartridge and photoconductor

tridge, Photo- unit are installed correctly. If installed correctly,
conductor try a new toner cartridge and then a new photo-
Unit conductor unit. If a new toner cartridge or photo-
conductor unit does not correct the problem,
replace the following FRUs one at a time in the
order shown:
HVPS
Engine board
White Spots
FRU Action
1 Transfer Check the transfer assembly for any signs of

Assembly broken parts, pitting, contamination or foreign
objects attached to or in the area of the transfer
roll.
If no problem is found, replace the following

FRUs one at a time in the order shown:
Transfer Assembly
HVPS
Light Print
FRU Action
1 Photoconduc- Be sure the photoconductor unit is correctly

tor Unit installed. Check the cartridge for damage and
pitted or contaminated contacts. If no problem is
found, replace the photoconductor unit.
2-42
4026-0XX
FRU Action
2 Toner Car- Replace the toner cartridge if the cartridge is

tridge nearing the end of life.
3 Transfer Check the transfer roll for toner buildup and con-
Assembly tamination. Clean the transfer roll by performing
POST two or three times.
Light print or black vertical streaks can be

caused by an open transfer leakage current cir-
cuit. Check the transfer roll right side contact,
TFR board lead and the TFR Leakage board
(PWB-T) for damage or poor contact.
If light print is still a problem, replace the follow-

ing FRUs one at a time in the order shown:
HVPS
Transfer Assembly
TFR Leakage board PWB-T
Engine board
Toner on backside of printed page
Note: Toner on the back of the printed page can be caused by poor
fusing, improper development, or incorrect charging.
FRU Action
1 Fuser Assem- Check the hot roll and backup roll for toner
bly buildup. Clean or replace as necessary.
If the fuser assembly is clean and functioning

correctly, replace the following FRUs one at a
time in the order shown:
HVPS
Engine board

4026-0XX
Registration Service Check

Note: Use the Service Test Page to check the registration.
FRU Action
1 Paper Be sure the paper is correctly installed in the

paper tray.
2 Registration Perform the registration adjustment when the

Adjustment engine board is replaced.
Transfer Assembly Service Check

Note: The transfer assembly left and right transfer bracket springs
bias the transfer assembly toward the photoconductor unit. Be sure
the transfer assembly is free to move and biased toward the photo-
conductor unit.
FRU Action
1 Transfer Be sure the transfer assembly is correctly

Assembly installed and the left and right transfer brackets
are properly positioned and fastened. Be sure
the left and right transfer bracket springs are
correctly installed and the transfer assembly is
free to move.
Check the transfer roll for toner buildup or dam-

age. Check the transfer roll drive gear for dam-
age or broken teeth. Check the transfer roll for
binds or improper operation and the right side
contact for damage. Replace the transfer
assembly as necessary.
Replace the transfer assembly if you have a hor-

izontal black bar 57 mm from the top of page.
Check the Transfer Leakage board, wiring, con-

tacts and transfer roll for signs of damage or
poor contact.
2-44
4026-0XX
Transfer Corona Service Check
FRU Action
1 Transfer Be sure the transfer corona is clean. Clean with

Corona the transfer cleaning tool located on the upper
fuser cover.
Check the high voltage contacts for pitting, con-

tamination, or damage. Be sure the corona
assembly is correctly installed in the transfer
assembly. Replace as necessary.
Be sure the wires T and TRET are not broken or

damaged, and are properly connected to the
transfer assembly and the HVPS. Replace as
necessary.
ROM SIMM Service Check
FRU Action
1 ROM SIMM Be sure the correct ROM SIMM is installed.

Models 4026-06B and 06F require ROM SIMM
with flash.
Be sure the ROM SIMM is correctly installed in

location socket (J8).

4026-0XX
3. Diagnostic Aids
This chapter explains the tests and procedures you can run to
identify printer failures and verify that repairs have corrected the
problem.
Power-On Self Test (Post)

The printer performs the following Power-On Self Test when
powered on:
1. All LEDs come on solid.

2. The fan turns on for 2 seconds.
4. The engine board checks the status of the cover interlock
switch.
5. The LEDs begin to turn on then off continuously.
6. The fan turns off.
7. The engine board checks the status of the paper exit sensor.
8. The engine board checks the status of the thermistor.
9. The fuser lamp turns on.
Note: The printer may be idle for up to 40 seconds as the fuser

warms to operating temperature. Printer idle time is shorter if
the fuser is already warm.
10. The polygon motor (printhead motor) turns on.

11. The main motor turns on.
12. The paper feed gears turn.
13. The print cartridge drive gear engages.
14. The paper feed take-up shaft and D-roll assembly rotates to
home position. (The paper feed lift plate assembly is in the
down position).
Diagnostic Aids 3-1

4026-0XX
16. Models 4026-06A, 06C, 06D and 06J, 070 and 071 - The Ready
LED turns on solid and the Data LED blinks. Go to Step 17.
Models 4026-06B and 06F - The Ready LED turns on solid and
the Data LED blinks.
• The controller board checks flash ROM installation.
• The controller board verifies that flash is formatted.
• The controller board attempts to format flash if unformatted.
• The Data LED blinks during format.
• The printer continues POST after format is complete.
• If format fails, a “Flash Memory Failure” error displays.
17. The main drive motor turns off.
18. The polygon motor (printhead motor) turns off.
19. The Data LED turns off.
20. The Ready LED stays on solid.
If the printer completes all these steps and no error indications are
displayed, the printer has successfully completed the POST.
Diagnostic Aids 3-2

4026-0XX
Diagnostic Tests
Printer Diagnostic Test
The following tests run sequentially when performing this test:
Standard Memory Test

Optional Memory Test
Microcode Check
LED Test
Read/Write ASIC Register Test
Read/Write ASIC SRAM Test
Read/Write controller board SRAM Test
Perform the following steps to run the Printer Diagnostic Test:
1. Turn the printer off.

2. Open the top cover.
3. Press and hold the operator panel button as you turn on the
printer. Release the button once the printer’s indicator lights
come on.
4. Wait until the Error LED (top cover open indication) comes on.
5. Close the top cover.
6. The Ready LED comes on solid and the Data LED blinks. (This
is the printer Busy Mode indication).
7. If all the diagnostic tests run correctly, the Ready LED goes off
and the Data LED continues to blink. If a test fails, the error light
pattern for the service error code displays on the operator
panel.
3-3
4026-0XX
Service Diagnostic Test Page

The service diagnostic test page includes registration marks to aid in
adjusting print registration and also includes the installed printer
base code level. The service test page displays the user default
values for the following:
Top Margin Offset

Left Margin Offset
Printer Page Count
Permanent Page Count
Print Darkness Setting
PQET Setting (on/off)
Toner Saver (on/off)
Print Resolution
Perform the following steps to print the Service Diagnostic Test

Page:
1. Turn the printer off.

3. Press and hold the operator panel button as you turn on the
printer.
4. Wait until the Error LED comes on solid.
5. Close the top cover.
6. The Ready LED is on solid and the Data LED blinks continu-
ously.
7. When the test is complete the Ready LED goes off and the Data
LED continues to blink.
8. Press the operator panel button briefly.
9. The Ready and Data LEDs blink and the Service Diagnostic
Test Page prints. The test page requires several seconds to
start printing.
10. When the test page has finished printing the Ready LED comes
on solid and Data LED goes off.
Note: After the diagnostic test page prints, the printer automatically
exits the diagnostic mode and returns to the normal mode.
Diagnostic Aids 3-4

4026-0XX
3-5
4026-0XX
User Mode Print Test Page

The User Mode Print Test Page displays the user default values,
installed options, printer features, various typefaces, and the
installed printer base code level.
1. Be sure the Ready LED is on solid (printer is in the ready state).

2. Press and release the operator panel button.
3. The Ready and Data LEDs blink continuously.
4. The test page prints and the operator panel Ready LED comes
on solid and the Data light turns off.
5. The printer returns to the ready state.
Diagnostic Aids 3-6

4026-0XX
3-7
4026-0XX
Paper Feed Timing

The following describes the timing of paper flow through the printer
to aid in diagnosing paper jam problems. Detection of paper in the
printer paper feed path is accomplished by the low or high status
condition of the paper entry and paper exit sensors. The timing of
the paper as it leaves the input paper tray, passes the input sensor,
exit sensor and into the exit tray, determines normal paper flow or a
paper jam.
Single Sheet Printing: When condition two in the following list is

detected and there is no paper in the paper path the printer powers
down except for the fuser lamp and fan motor.
Multi Sheet Printing: When condition two in the following list is

detected and paper is in the paper path the printer powers down
except for the fan motor.
• Both the paper entry and paper exit sensors are activated
whenever the printer is turned on or the top cover is closed.
• If the paper does not activate the paper entry sensor in the base
printer within two seconds after the D-roll starts rotating or
within four seconds after the D-roll in the optional second paper
tray, if installed, starts rotating, a paper feed error occurs.
• If the paper entry sensor does not deactivate within eleven sec-
onds after the paper leading edge has activated the sensor, a
paper jam error occurs.
• If the paper exit sensor is not activated within 3.5 to 4.5 seconds
after the leading edge of the paper has activated the paper
entry sensor, a paper jam error occurs.
• If the paper exit sensor is not deactivated within 3.4 to 4.7 sec-
onds by the trailing edge of the paper, a paper jam error occurs.
Diagnostic Aids 3-8

4026-0XX
Fuser Operation
Fuser Mode Printer Action
Warm-Up Mode When the printer power is turned on

the fuser lamp turns on until the hot
roll temperature reaches approxi-
mately 172 degrees centigrade.
Standby Mode The hot roll temperature reaches

approximately 156 degrees centi-
grade. If this temperature is main-
tained for three minutes, the printer
switches to low temperature standby
mode and the hot roll is maintained
at 112 degrees centigrade.
Print Cycle The hot roll is maintained at 172

degrees centigrade if the engine
board receives a print command
from the controller board.
Note: The hot roll temperature is

slightly higher on models 06C and
06F during the print cycle.
Fuser Control
The thermistor detects the hot roll temperature and sends a

corresponding analog signal to the engine board. The engine board
turns the lamp on or off depending on the analog signal from the
thermistor.
If the thermistor detects a high temperature failure but the fuser lamp
does not turn off, the thermal fuse opens (thermostat on models
4026-06C and 06F) and the engine board turns the fuser lamp off.
3-9
4026-0XX
Configuration Mode
The configuration mode gives the ability to set the following printer
functions through the operator panel:
Hex Trace
NPA Mode (Parallel)
Parallel Protocol
Advanced Status
PPDA Activated
Auto CRLF/LFCR
Perform the following steps to enter the configuration mode:
1. Turn the printer power off.

3. Turn the printer power on.
4. Top Cover Open (Error LED on) is displayed on the operator
panel.
5. Double-click the operator panel button.
6. The printer is in the configuration mode. The Ready LED is on
solid. The Data, Load Paper, Paper Jam, Error and Press But-
ton are off.
Note: Closing the top cover causes the printer to exit the configura-
tion mode. Repeat the steps to reaccess the configuration mode.
Configuration Mode Operator Panel Overlay
The following overlay indicates the operator panel LED and button
designations when in the configuration mode.
Hex Trace
NPA Mode
Parallel Protocol
Advance Status
CRLF/LFCR
Off/On/Auto
Press three seconds to save
Diagnostic Aids 3-10

4026-0XX
Operator Panel Configuration Mode Button Definition
Term Description Result
Brief Button Press Press the operator This action moves

panel button no longer through the configura-
than three seconds. tion mode value list.
Long Button Press Press and hold the This action selects
operator panel button and saves the value
for more than three for the menu item dis-
seconds. played. To indicate
that the setting is
saved, it is displayed
on the operator panel.
Double-Click Button Press and release the This action moves

Press operator panel button through the configura-
two times. Each tion mode value list.
press and release
action must be per-
formed within a half
second.
3-11
4026-0XX
Hex Trace
Use Hex Trace to isolate the cause of print problems. When a job is
printed, the printer operator panel displays the Hex Trace indication,
(Ready LED blinking), showing that the printer remains in the Hex
Trace mode. Turn the printer power off or do a front panel reset (long
button press) to exit the Hex Trace mode.
Perform the following steps to enter the Hex Trace mode:
1. Enter the configuration mode.

2. Do a brief button press.
3. The Ready LED is on and the Press Button (Off/On/Auto) is
on or off indicating the value selected. A brief button press
causes the printer to cycle through the valid settings for Hex
Trace and the Press Button LED turns on or off.
Operator Panel LED Status Action
Off/On/Auto LED and Hex Trace A long button press causes the
LED is off printer to exit configuration mode
and enter the normal printing mode
or a demo printing mode.
A double-click button press causes

the next menu item, NPA mode, to
display
Off/On/Auto LED and Hex Trace A long button press causes the
LED is on printer to exit the configuration mode
and enter Hex Trace mode.
A double-click button press causes

the next menu item, NPA mode, to
display.
4. Press and hold the button until the Saved setting indication,
(all LEDs on solid) is posted.
5. When the Error LED comes on, close the top cover.
6. The printer completes POST with the Ready LED blinking
indicating the printer is in the Hex Trace mode.
7. Do a double-click to proceed to the next mode. Do an opera-
tor panel reset or turn the printer off to exit the Hex Trace
mode.
Diagnostic Aids 3-12

4026-0XX
Restoring Factory Defaults

Restoring factory defaults returns the printer settings to the original
factory settings.
Perform the following steps to invoke factory defaults:
1. Turn the printer power off.

3. Turn the printer power on. The printer starts POST.
4. The operator panel Error LED comes on solid.
5. Press and hold the operator panel button until all the LEDs
are on solid indicating the printer is restoring factory defaults.
6. Release the button. The printer indicates the operation is
complete by turning all the LEDs off except the Error LED.
7. The configuration mode can be selected by doing a brief but-
ton press or closing the top cover which causes the printer to
enter either the normal mode or the demo mode.
3-13
4026-0XX
4. Repair Information
WARNING: Read the following before handling electronic parts.
Handling ESD-Sensitive Parts

Many electronic products use parts that are known to be sensitive to
electrostatic discharge (ESD). To prevent damage to ESD-sensitive
parts, follow the instructions below in addition to all the usual
precautions, such as turning off power before removing logic boards:
• Keep the ESD-sensitive part in its original shipping container (a

special “ESD bag”) until you are ready to install the part into the
machine.
• Make the least-possible movements with your body to prevent
an increase of static electricity from clothing fibers, carpets, and
furniture.
• Put the ESD wrist strap on your wrist. Connect the wrist band to
the system ground point. This discharges any static electricity in
your body to the machine.
• Hold the ESD-sensitive part by its edge connector shroud
(cover); do not touch its pins. If you are removing a pluggable
module, use the correct tool.
• Do not place the ESD-sensitive part on the machine cover or on
a metal table; if you need to put down the ESD-sensitive part for
any reason, first put it into its special bag.
• Machine covers and metal tables are electrical grounds. They
increase the risk of damage because they make a discharge
path from your body through the ESD-sensitive part. (Large
metal objects can be discharge paths without being grounded.)
• Prevent ESD-sensitive parts from being accidentally touched by
other personnel. Install machine covers when you are not work-
ing on the machine, and do not put unprotected ESD-sensitive
parts on a table.
• If possible, keep all ESD-sensitive parts in a grounded metal
cabinet (case).
• Be extra careful in working with ESD-sensitive parts when cold-
weather heating is used because low humidity increases static
electricity.
Repair Information 4-1

4026-0XX
Adjustment Procedures
CAUTION: Be sure to unplug the power cord whenever you are
working on the printer with one of the covers removed.
Print Registration Adjustment
Print the service diagnostic test page after you replace the engine
board. Check the position of the bottom left and right registration
lines. Adjust VR1 on the engine board to position both lines exactly
on the trailing edge of the page. A slight turn on VR1 produces
significant change in the registration line position. Turning the
adjustment clockwise increases the gap between the registration
lines and the trailing edge of the page and counter clockwise
decreases the gap.
4-2
4026-0XX
Removal Procedures
CAUTION: Be sure to unplug the power cord whenever you are
working on the printer with one of the covers removed.
Use caution when the photoconductor unit is out of the machine. Do

not expose it to light for more than 15 - 20 minutes.
Screw Identification Table

4026-0XX
Board Cage Removal

1. Remove the controller board.
2. Remove the engine board.
3. Remove the two remaining screws that hold the board cage to
the mainframe.
4. Note the way the cables are routed to the engine board before
removing the board cage.
5. Remove the board cage.
Cover Removals
Input Paper Tray
1. Press the left and right tray latches to allow the tray to rest at the
lowest position.
2. Press the center of the input paper tray slightly to release the
left and right side frame tabs.
3. Remove the input paper tray.
Left Side Cover
1. Loosen the two screws on the left side frame.

2. Release the bottom cover tabs.
3. Gently pull up and remove the left side cover.
Right Side Cover
1. Remove the two side cover screws that attach the right side
cover to the board cage.
2. Rotate the right side cover down and remove.
Note: Be sure the lower front side cover mounting is properly

snapped into place when you reinstall the right side cover. If install-
ing a new right side cover on models 06C and 06F, transfer the print
registration information label from the old cover to the new cover.
Front Cover
Pull the front cover up and forward to remove.
4-4
4026-0XX
Top Cover
1. Unplug the power cord from the machine.

2. Remove the toner cartridge and P.C. drum.
3. Remove the left, right, and front covers.
4. Disconnect CN7, CN11, CN2, and CN8 from the engine board.
5. Remove the fuser lamp cable cover.
6. Remove the cable cover from the LVPS.
7. Disconnect the fuser lamp connector from the LVPS.
8. Remove the transfer assembly from the top cover.
9. Carefully disconnect the red leads.
10. Note the mounting and orientation of the left and right transfer
assembly tension springs.
11. Remove the transfer assembly left and right tension springs.
12. Grasp the top cover. Use a screwdriver to pry the top cover left
and right pivot arms from the main frame mounting pins.
13. Remove the top cover.
Controller Board Removal

2. Remove the right cover.
3. Disconnect the operator panel cable, J5 from the controller
board.
4. Remove the operator panel.
5. Remove the two screws that mount the board cage.
6. Remove the two screws that mount the Centronix parallel
interface connector to the board cage bracket.
7. Remove the three screws that mount the controller board.

4026-0XX
D-Roll Removal
1. Remove the paper feed input tray assembly.
2. Remove the paper lift plate assembly.
3. Remove the manual feed guide plate.
6. Remove the paper feed frame assembly.
7. Remove the left side plate assembly.
8. Remove the C-clip from both ends of the D-roll shaft.
9. Remove the D-roll clutch cam assembly.
Note: When you remove the clutch cam assembly, the D-roll shaft
pin can fall from the shaft. Be careful not to lose the pin.
10. Slide the D-roll shaft slightly toward the left.

11. Remove the D-roll shaft by lifting and pulling the shaft toward
the center of the printer.
Engine Board Removal

3. Disconnect all the cables from the engine board.
4. Remove the three board mounting screws and remove the
engine board.
Exit Sensor Removal

1. Remove the fuser upper and lower frame assemblies.
2. Disconnect the exit sensor cable.
3. Unsnap the sensor from the frame and remove.
Exit Sensor Flag Removal

1. Remove the fuser upper and lower frame assemblies. Note how
the exit sensor flag torsion spring is mounted.
2. Unsnap the flag from the frame.
Note: Be careful when you handle the flag and spring. They are
easily damaged.
4-6
4026-0XX
Exit Paper Feed Roller Assembly Removal

1. Remove the transfer assembly.
3. Note the orientation of the notches in the left and right bushings.
Reinstall with the notches facing away from the top cover.
4. Be sure the right end of the shaft contacts the ground strap.
Fan Removal
2. Disconnect the fan cable from the engine board.
6. Remove the top cover cable cover.
7. Remove the screw holding the fan assembly to the rear of the
top cover.
8. Unlatch the fan cover assembly from the top cover.
9. Remove the fan assembly.
CAUTION: Be sure the fuser assembly has cooled before

working on any of the following fuser FRUs.
Fuser Lamp Removal

1. Remove the fuser upper frame assembly.
2. Caution: Hold the left side fuser support plate and carefully
remove the support plate screw. There is pressure against the
other end of the lamp therefore care must be used when you
remove the lamp from the fuser. Grip the lamp by the ceramic
end piece and remove it from the fuser assembly. Be careful not
to touch the glass.
3. Remove the fuser lamp.

4026-0XX
Fuser Lower Frame Assembly Removal

3. Remove the four fuser lower frame assembly mounting screws.
4. Use a screwdriver to unlatch the left end of the fuser cable cover
and remove the cover.
5. Remove the fuser lower frame assembly.
Fuser Upper Frame Assembly Removal

2. Remove the left and right transfer assembly mounting brackets
on models 4026-06A, 06B, 06D, and 06J. Remove the left and
right transfer assembly mounting screws on models 4026-06C
and 06F.
3. Remove the five screws that hold the fuser upper frame
assembly and the left hand gear assembly.
4. Disconnect the exit sensor and thermistor cables.
Fuser Paper Separator Removal

3. Note the type and location of each separator. The location and
type are determined during manufacture.
4. Use a screwdriver to release the latch that holds the separator
in position.
5. Remove the paper separator.
4-8
4026-0XX
HVPS Board Removal

2. Remove the HVPS cover.
3. Disconnect CN1 from the HVPS board.
4. Disconnect the transfer assembly high voltage connector from
T1 on the HVPS board.
5. Disconnect the red transfer assembly wire at TRET on the
HVPS board.
6. Remove the four HVPS board mounting screws.
7. Remove the HVPS board.
HVPS Cover Removal

2. Remove the screw holding the HVPS cover to the main frame.
3. Insert a screwdriver in the HVPS cover slot and release the
cover latch.
4. Remove the HVPS cover.
Left Side Plate Removal

3. Remove the printhead assembly.
4. Remove the main drive motor.
5. Remove the four screws holding the left side plate to the main
frame.
6. Slide the left side plate toward the front of the machine and
remove.
Note: The main drive/paper feed gears are free to fall from their
mounting studs with the left side plate removed. Be careful not to
lose the gears.

4026-0XX
LVPS Removal
2. Remove the four screws that secure the back of the rear frame
to the LVPS.
3. Remove the two screws that hold the top of the rear frame to the
LVPS and remove the rear frame.
4. Remove the two screws mounting the on/off switch to the main
frame.
5. Remove the four screws holding the LVPS to the main frame.
6. Maneuver and lift the LVPS from the main frame.
Main Drive Motor Removal

2. Remove the right, left, and front covers.
3. Disconnect the main drive motor cable CN6 from the engine
board.
4. Remove the two screws mounting the main drive motor to the
left side plate.
Main Drive/Paper Feed Gears Removal

2. Remove the right, left, and front covers.
3. Remove the printhead assembly.
5. Remove the left side plate.
6. Remove the main drive/paper feed gears.
Manual Paper Feed Guide Plate Removal

3. Remove the screw holding the manual feed guide plate to the
main frame.
4. Remove the manual paper feed guide plate.
4-10
4026-0XX
Operator Panel Removal

2. Remove the toner cartridge and P.C. drum.
3. Disconnect the operator panel cable from the controller board.
4. Loosen the front operator panel mounting screw from the board
cage.
5. Remove the rear operator panel mounting screw from the board
cage.
6. Remove the operator panel.
Paper Entry Sensor Removal

7. Disconnect the paper entry sensor cable.
8. Use a screwdriver to release the paper entry sensor latches.
9. Remove the paper entry sensor.
Paper Entry Sensor Flag Removal

7. Use a screwdriver to gently apply outward pressure on the flag
pivots to release the flag from the mounting.
8. Remove the paper entry sensor flag.

4026-0XX
Paper Feed Frame Assembly Removal

5. Disconnect the paper feed sensor/solenoid cable CN3 from the
engine board.
Paper Feed Solenoid Removal

7. Remove the paper feed solenoid mounting screw.
8. Disconnect the solenoid cable.
9. Remove the paper feed solenoid.
Paper Feed Input Tray Assembly Removal

1. Place the printer on it’s back.
2. Remove the four screws holding the paper feed input tray
assembly to the frame.
Paper Lift Plate Assembly Removal

3. Press the lift plate assembly to the left.
4-12
4026-0XX
Paper Separator Removal

2. Remove the lift plate assembly.
7. Use a screwdriver to release either side of the separator
latches.
8. Remove the paper separator.
Printhead Removal
3. Disconnect CN5 and CN10 printhead cables from the engine
board.
4. Remove the four screws from the main frame.
5. Remove the 14 mm screw located in the center of the lower
frame.
6. Gently pry the printhead locator tabs from the left and right main
frame mounting slots and remove the printhead.
Print Media Selection Lever Removal (06C/06F/071)

2. Remove the selection lever mounting screw.
3. Remove the print media selection lever.
Second Paper Tray Option Connector Removal

3. Disconnect the CN9 cable from the engine board.
4. Remove the two screws holding the option connector to the
main frame.
5. Remove the second paper tray option connector.

4026-0XX
Thermal Fuse Removal (06A/06B/06D/06J/070)

3. Remove the two screws mounting the thermal fuse.
4. Remove the thermal fuse.
Thermostat Removal (06C/06F/071)

3. Remove the two thermostat mounting screws.
4. Remove the fuser thermostat.
Thermistor Removal
1. Remove the fuser lower frame assembly.
2. Remove the screw that holds the thermistor to the left side of
the fuser lower frame assembly.
3. Note the routing of the thermistor cable and remove the
thermistor.
Transfer Unit Removal

Models 4026-06A, 06B, 06D, 06J and 070

2. Remove the screw holding the right transfer assembly bracket.
3. Note the mounting and orientation of the left and right transfer
assembly tension springs.
5. Remove the transfer assembly tension springs.
4-14
4026-0XX
Models 4026-06C, 06F and 071

2. Remove the transfer cable cover screw and transfer cable cover.
3. Remove the two screws that hold the transfer unit to the rear of
the top cover.
4. Unplug the wire to the transfer roll assembly. Pay attention to
the wire routing.
5. Remove the transfer unit.

4026-0XX
5. Connector Locations
Low Voltage Power Supply
Connector Pin No. Signal
CN1 Engine Board 1 +24 V dc

2 GND
3 GND
4 +5 V dc
5 FUSER LAMP*
CN2 Fuser Lamp/ 1 HEAT N
Thermal Fuse
2 NO CONNECTION
3 HEAT L
Connector Locations 5-1

4026-0XX
High Voltage Power Supply
CN1 Engine Board 1 HV C

2 HV T*
3 HV SEL 2*
4 HV SEL 1*
5 HV B
6 BIAS MON
7 GND
8 +24 V dc
T T HV to TRANSFER
CORONA CHARGE
TRET TRET HV to TRANSFER
CORONA HOUSING

4026-0XX
Engine Board
CN1A Controller Board
Pin No. Signal Pin No. Signal
1 NO CONNECTION 16 CMD*
2 NO CONNECTION 17 CTBSY*
3 NO CONNECTION 18 PRINT*
4 NO CONNECTION 19 SRCLK*
5 GND 20 GND
6 RESET* 21 GND
7 GND 22 VIDEO*
8 GND 23 +5 V dc
9 GND 24 GND
10 HSYND* 25 +5 V dc
11 EPRDY* 26 GND
12 PRRDY* 27 +5 V dc
13 TDD* 28 CPRDY*
14 ETBSY* 29 +5 V dc
15 STS* 30 TEST*
Connector Pin Signal
CN2A Thermistor 1 THERMISTOR

2 +5 V dc
CN3A Paper Entry 1 ANODE (PC1)
Sensor and Paper
Take-up Solenoid 2 GND
3 PC1*
4 NO CONNECTON
5 +24 V dc
6 FEED1*
5-3
4026-0XX
CN4A HVPS 1 HV C
2 HV T*
3 HV SEL2*
4 HV SEL1*
5 HV B
6 BIAS MON
7 GND
8 +24 V dc
CN5A Laser Diode 1 S SCAN
Drive Board
2 CO
3 LD APC2 (LDVR2)
4 LD APC1 (LDVR1)
5 GND
6 L DATA*
7 +5 V dc
CN6A Main Motor 1 PHASE A
2 PHASE A*
3 PHASE B
4 PHASE B*
CN7A LVPS 1 +24 V dc
2 GND
3 GND
4 +5 V dc
5 FUSER LAMP*
CN8A Paper Exit Sen- 1 ANODE (PC3)
sor
2 GND
3 PC3*

4026-0XX
CN9A 2nd Paper Tray 1 +24 V dc

(Option)
2 FEED 2*
3 NO CONNECTION
4 +5 V dc
5 GND
6 P EMP2
7 PSIZED
8 2NDBIN*
9 MM/INCH
10 CHECK0*
11 CHECK1*
12 CHECK2*
CN10A Polygon Motor 1 NO CONNECTION
2 +24 V dc
3 GND
4 +5 V dc
5 POLYGON CONTROL
CN11A Fan Motor 1 FAN*
2 +24 V dc
5-5
4026-0XX

4026-0XX
Second Paper Tray Sensor Board (Option)
CN1A Engine Board 1 CHECK2*

2 CHECK1*
3 CHECK0*
4 MM/INCH
5 2NDBIN*
6 PSIZEO
7 P EMP 2
8 GND
9 +5 V dc
10 NO CONNECTION
11 FEED2*
12 +24 V dc
CN3A Paper Take-up 1 +24 V dc
Solenoid - 2nd Paper
Tray (Option)
2 FEED2*
Controller Board
J5 Operator Panel 1 GND

2 +5 V dc
3 OP DAT
4 OP CLK
5 OP BTN 1
6 OP BTN 2
5-7
4026-0XX
J4 Engine Board
1 NO CONNECTION 16 CMD
2 NO CONNECTION 17 CTBSY
3 NO CONNECTION 18 PRINT
4 NO CONNECTION 19 SRCLK
5 GND 20 GND
6 RESET* 21 GND
7 GND 22 R VIDEO*
8 GND 23 +5 V dc
9 GND 24 GND
10 RHSYNC* 25 +5 V dc
11 EPRDY* 26 GND
12 PRRDY* 27 +5 V dc
13 TOD* 28 CPRDY
14 ETBSY* 29 +5 V dc
15 STS* 30 NO CONNECTION
J3 Pullup Power 1 +5 V dc
2 +5 V dc JUMPER
3 NO CONNECTION

4026-0XX
J2 Parallel Port
1 RSTROBE* 19 GND
2 D0 20 GND
3 D1 21 GND
4 D2 22 GND
5 D3 23 GND
6 D4 24 GND
7 D5 25 GND
8 D6 26 GND
9 D7 27 GND
10 RACK* 28 GND
11 RBUSY 29 GND
12 RPERROR 30 GND
13 RSELOUT 31 RINIT*
14 RAUTOFD* 32 RFAULT*
15 GND 33 GND
16 GND 34 GND
17 GND 35 GND
18 PLH 36 RSELECTIN*
5-9
4026-0XX

4026-0XX
Paper Exit Sensor
CN3S Engine Board 1 ANODE (PC3)

2 GND
3 PC3*
Paper Entry Sensor
CN1S Engine Board 1 PC1*

2 GND
3 ANODE (PC1)
Paper Feed Solenoid
CN2S Engine Board 1 +24 V dc

2 FEED1*
5-11
4026-0XX
6. Parts Catalog
How To Use This Parts Catalog

• SIMILAR ASSEMBLIES: If two assemblies contain a majority of
identical parts, they are broken down on the same list. Common
parts are shown by one index number. Parts peculiar to one or
the other of the assemblies are listed separately and identified
by description.
• AR: (As Required) in the Units column indicates that the quan-
tity is not the same for all machines.
• NS: (Not Shown) in the Asm-Index column indicates that the
part is procurable but is not pictured in the illustration.
• PP: (Parts Packet) in the parts description column indicates the
part is contained in a parts packet.
• INDENTURE: The indenture is marked by a series of dots
located before the parts description. The indenture indicates the
relationship of a part to the next higher assembly. For example:
INDENTURE RELATIONSHIP OF PARTS
(No dot) MAIN ASSEMBLY
(One dot) o Detail parts of a main assembly
(One dot) o Subassembly of the main assembly
(Two dot) o o Detail part of a one-dot subassembly
(Two dot) o o Subassembly of a one-dot subassembly
Parts Catalog 6-1

4026-0XX
Assembly 1: Covers
6-2
4026-0XX
Asm- Part
Units Description
Index Number
1-1 69G8341 1 Left Side Cover
1-2 69G9969 1 Cover, Cable 06A/06B/06D/06J/070
1-2 11A7376 1 Cover, Cable 06C/06F/071
1-3 69G8301 1 Top Cover 06A/06B/06D/06J/070
1-3 11A7377 1 Top Cover 06C/06F/071
1-4 69G8306 1 Fan Cover 06A/06B/06D/06J/070
1-4 11A7378 1 Fan Cover 06C/06F/071
1-5 69G8305 1 Fan 06A/06B/06D/06J/070
1-5 11A7379 1 Fan 06C/06F/071
1-6 8 Screw, Type 3704 PP 69G9974
1-7 69G9990 1 Label, S/N Blank
1-8 69G8340 1 Exit Paper Tray
1-9 69G8303 1 Cover Release Assembly
1-10 69G8302 1 Printhead Interlock Actuator
1-11 4 Screw, Type 3504 PP 69G9974
1-12 2 Screw, Type 4011 PP 69G9974
1-13 69G8396 1 Operator Panel Assembly inc. English Overlay
1-13 69G9981 1 Operator Panel Assembly inc. Overlay W.T. Kit
1-13 11A7458 1 Operator Panel Assembly inc. Japanese
Overlay
1-14 69G8342 1 Right Side Cover with shield
1-15 69G9690 1 Logo, Optra E 06A/06B/06J
1-15 11A7443 1 Logo, Optra Ep 06D
1-15 11A7380 1 Logo, Optra Es 06C/06F/071
1-15 11A7759 1 Logo, Optra E+ 070
1-16 69G8344 1 Input Paper Tray
1-16A 11A7463 1 Label, Lever Overlay Sheet U.S.
1-16A 11A7464 1 Label, Lever Overlay Sheet W.T.
1-17 69G8343 1 Front Cover
1-17A 69G8298 1 Input Paper Tray Extended Guide w/screw
NS 11A7758 1 Input Tray Legs, Left and Right Side
NS 11A7757 1 Input Tray Cover Assembly
NS 11A7761 1 Manual Feed Tray Right Paper Guide
Parts Catalog 6-3

4026-0XX
Assembly 1: Covers (continued)
6-4
4026-0XX
Asm- Part
Units Description
Index Number
1-18 69G8337 1 Gear, 15T
1-19 69G8338 2 Bushing
1-20 11A7404 1 Terminal, PWB-R to Fuser Frame
1-21 69G9998 1 Terminal, Paper Feed Exit Shaft to Board
PWB-R
1-21A 11A7403 1 Terminal, Top Cover Ground to PWB-T
1-22 69G9999 1 Board, PWB-R
1-23 69G9971 2 Exit Paper Feed Roller/Clip Assembly
1-24 69G8336 1 Exit Paper Feed Roller/Shaft Assembly 06A/
06B/06D/06J/070
1-24 11A7465 1 Exit Paper Feed Roller/Shaft Assembly 06C/
06F/071
1-25 69G8304 1 Cover, Wiring Harness Cable
Parts Catalog 6-5

4026-0XX
Assembly 2: Frame
6-6
4026-0XX
Asm- Part
Units Description
Index Number
2-1 69G9962 1 Motor, Main Drive 06A/06B/06D/06J/070
2-1 11A7381 1 Motor, Main Drive 06C/06F/071
2-2 69G9691 1 Left Side Plate Motor Bracket 06A/06B/06D/
06J/070
2-2 11A7382 1 Left Side Plate Motor Bracket 06C/06F/071
2-3 2 Screw, Type 1308 PP 69G9974
2-4 1 Screw, Type 3501 PP 69G9974
2-5 3 Screw, Type 3704 PP 69G9974
2-6 2 Screw, Type 3504 PP 69G9974
2-7 69G8345 1 Left Side Plate
2-8 69G8346 1 Guide, photoconductor unit
2-9 69G8347 1 Guide, Toner Cartridge/Photoconductor Unit
2-9A 11A7420 1 Bracket, Printhead Mounting
Parts Catalog 6-7

4026-0XX
Assembly 2: Frame (continued)
6-8
4026-0XX
Asm- Part
Units Description
Index Number
2-10 1 Gear, 20/41T PP 69G9989
2-11 1 Gear, 29T PP 69G9989
2-12 1 Gear, 22/57T PP 69G9989
2-13 1 Gear, 44/109T PP 69G9989
2-14 1 Gear, 29/65T PP 69G9989
2-15 1 Gear, 25/72T PP 69G9989
2-16 1 Gear, 22/45T PP 69G9989
2-17 1 Gear, 50T PP 69G9989
2-18 69G8358 1 Terminal, Rt Side Ground LVPS to Bd Cage
2-19 69G8360 1 Terminal, Rt Side Photoconductor Unit Ground
2-20 69G8361 1 Terminal, Rt SIde, Photoconductor Unit
Charge Bias
2-21 69G8362 1 Terminal, Rt Side Toner Cartridge
2-22 69G8357 1 Spring, Rt Side Frame, Cartridge Latching
PP 69G9987
2-23 69G8359 1 Terminal, Rt Side Ground HVPS to Bd Cage
2-24 69G9982 1 Terminal, Ground
2-24A 11A7424 1 Terminal, Left Side Plate to LVPS
2-24B 11A7425 1 Terminal, Left Side Plate to Lift Plate
Parts Catalog 6-9

4026-0XX
Assembly 2: Frame (continued)
6-10
4026-0XX
Asm- Part
Units Description
Index Number
2-25 2 C-Clip, Type 9107 PP 69G9986
2-26 69G8377 1 Clutch Cam Assembly
2-27 69G8379 1 Bushing
2-28 69G8393 1 D-Roll Shaft
2-29 69G9991 2 Pin, D-Roll Shaft
2-30 69G8375 1 D-Roll
2-31 69G8363 4 Rubber Foot 06A/06B/06D/06J
2-31 11A7467 4 Rubber Foot 06C/06F
Parts Catalog 6-11

4026-0XX
Assembly 3: Printhead
6-12
4026-0XX
Asm- Part
Units Description
Index Number
3-1 69G8364 1 Printhead Assembly 600 dpi
3-2 5 Screw, Type 3504 PP 69G9974
3-3 1 Screw, Type 3519 PP 69G9974
Parts Catalog 6-13

4026-0XX
Assembly 4: Paper Feed Input Tray
6-14
4026-0XX
Asm- Part
Units Description
Index Number
4-1 11A7419 1 Lift Plate Assembly
4-2 69G8367 1 Pressure Spring
4-3 69G8394 1 Guide Plate, Manual Feed 06A/06B/06D/06J/
070
4-3 11A7460 1 Guide Plate, Manual Feed 06C/06F/071
4-4 69G8366 1 Guide, Movable Paper
4-5 3 Screw, Type 3704 PP 69G9974
4-6 2 Screw, Type 3504 PP 69G9974
4-7 69G8365 1 Paper Feed Input Tray Assembly
06A/06B/06D/06J/070
4-7 11A7466 1 Paper Feed Input Tray Assembly 06C/06F
4-8 1 Screw, Type 3907 PP 69G9974
4-9 11A7462 1 Lever, Print Media Selection w/screw 06C/06F/
071
Parts Catalog 6-15

4026-0XX
Assembly 5: Paper Feed Frame
6-16
4026-0XX
Asm- Part
Units Description
Index Number
5-1 69G8368 1 Paper Feed Frame Assembly 06A/06B/06D/
06J/070
5-1 11A7384 1 Paper Feed Frame Assembly 06C/06F/071
5-2 69G8369 1 Gear, 16T Top Paper Feed
5-3 69G8371 1 Sensor, Paper Entry
5-3A 11A7409 1 Cable, Input Sensor/Solenoid to Engine Board
5-4 69G8372 1 Flag, Paper Entry Sensor
5-5 69G8373 1 Separator, Paper 06A/06B/06D/06J070
5-5 11A7459 1 Separator, Paper 06C/06F/071
5-6 11A7442 1 Front Paper Feed Pressure Roller Assembly
5-7 69G8374 1 Terminal, Solenoid Ground
5-8 5 Screw, Type 3907 PP 69G9974
5-9 69G8370 1 Solenoid, Paper Feed
5-10 11A7386 2 Spring, Pressure 06C/06F/071
5-11 11A7385 1 Bracket, Rear Paper Feed Pressure Roller
06C/06F/071
5-12 11A7389 1 Rear Paper Feed Pressure Roller 06C/06F/071
5-13 11A7387 2 Gears, Idler 16T 06C/06F/071
5-14 11A7388 1 Bracket, Idler Gear 06C/06F/071
5-15 11A7461 1 Gear, 16T Bottom Paper Feed
Parts Catalog 6-17

4026-0XX
Assembly 6: Fuser
6-18
4026-0XX
Asm- Part
Units Description
Index Number
6-1 69G8312 1 Fuser Assembly, 120 V ac 06A/06B/06D/070
6-1 11A7390 1 Fuser Assembly, 120 V ac 06C/06F/071
6-1 11A7455 1 Fuser Assembly, 100 V ac 06J
6-1 69G8313 1 Fuser Assembly, 220/230 V ac 06A/06B/06D/
070
6-1 11A7391 1 Fuser Assembly, 220/230 V ac 06C/06F/071
6-2 69G8328 1 Lower Fuser Assembly 06A/06B/06D/06J/070
6-2 11A7392 1 Lower Fuser Assembly 06C/06F/071
6-3 1 Gear, 40T PP 69G9988
6-4 69G8371 1 Sensor, Paper Exit
6-4A 11A7408 1 Cable, Paper Exit Sensor
6-5 69G8332 1 Flag, Paper Exit Sensor
6-6 11A7423 1 Spring, Exit Sensor Flag
6-7 69G8333 3 Separator, Paper Hot Roll 06A/06B/06D/06J/
070
6-7 11A7393 3 Separator, Paper Hot Roll 06C/06F/071
6-7A 11A7421 1 Separator Roll
6-8 69G8314 1 Thermal Fuse 06A/06B/06D/06J/070
6-8A 11A7394 1 Thermostat 06C/06F/071
6-9 69G8327 1 Terminal, Fuser Lamp Right Side
06A/06B/06D/06J/070
6-9 11A7395 1 Terminal, Thermostat/Fuser Lamp Right Side
06C/06F/071
6-10 9 Screw, Type 3704 PP 69G9974
6-11 69G8329 2 Support Plate, Thermal Fuse
06A/06B/06D/06J/071
6-12 69G9973 2 Spring, Backup Roll PP 69G9987
6-13 11A7422 2 Bracket, Backup Roll Spring
6-14 69G8315 1 Fuser Lamp, 120 V ac
6-14 69G8316 1 Fuser Lamp, 220/230 V ac
6-14 11A7456 1 Fuser Lamp, 100 V ac 06J
6-15 69G9694 2 G-Ring, Hot Roll
6-16 69G9695 2 Bearing, Hot Roll
6-17 69G9977 1 Hot Roll 06A/06B/06D/06J/070
6-17 11A7396 1 Hot Roll 06C/06F/071
Parts Catalog 6-19

4026-0XX
Assembly 6: Fuser (continued)
6-20
4026-0XX
Asm- Part
Units Description
Index Number
6-18 69G9978 1 Backup Roll 06A/06B/06D/06J/070
6-18 11A7397 1 Backup Roll 06C/06F/071
6-19 4 Screw, Type 1305 PP 69G9974
6-20 69G8317 1 Thermistor 06A/06B/06D/06J/070
6-20 11A7398 1 Thermistor 06C/06F/071
6-21 69G8330 1 Separator, Paper
6-22 1 Screw, Type 3504 PP 69G9974
6-23 1 Gear, 30T PP 69G9988
6-24 69G8325 1 Cable, Fuser Lamp
6-25 69G8326 1 Terminal, Fuser Lamp Left side
6-26 69G9979 1 Terminal, Fuser Lamp/Thermal Fuse
6-26 11A7399 1 Terminal, Thermostat Left Side 06C/06F/071
6-27 69G8318 1 Upper Fuser Assembly
6-28 1 Gear, 21/38T PP 69G9988
6-29 1 Gear, 22T PP 69G9988
6-30 69G9697 Lever, Fuser Drive
6-31 69G8323 1 Spring, Inside PP 69G9987
6-32 Gear, 44T PP 69G9988
6-33 1 Gear, 25/50T PP 69G9988
6-34 69G9698 Arm, Fuser Drive
6-35 69G8324 1 Spring, Outside PP 69G9987
6-36 69G9699 Bracket, Fuser Drive
6-37 11A7431 1 Transfer Corona cleaning tool
Parts Catalog 6-21

4026-0XX
Assembly 7: Electronics
6-22
4026-0XX
Asm- Part
Units Description
Index Number
7-1 69G8380 1 Power Supply, 120 V ac U.S.
7-1 69G8382 1 Power Supply, 220/230 V ac W.T.
7-1 11A7454 1 Power Supply, 100 V ac Japan
7-2 1339526 1 Power Cord; U.S., AP-Taiwan, Australia,
Bolivia, Brazil, Canada, Columbia, Costa Rica,
Ecuador, El Salvador, Guatemala, Honduras,
Hong Kong, Mexico, Nicaragua, Panama, Peru
(HV), Venezuela
7-2 1342536 1 Power Cord; Argentina, Paraguay, Uruguay
7-2 1339520 1 Power Cord; Austria, Belgium, Eastern
Countries, Finland, France, Germany, Greece,
Iceland, Netherlands, Norway, Portugal, Spain,
Sweden, Turkey
7-2 1339519 1 Power Cord; Bahrain, Egypt, Iraq, Ireland,
Jordan, Kuiwait, Oman Qatar, Sudan, U.K.,
Yeman
7-2 1342534 1 Power Cord; Chile (HV)
7-2 1339525 1 Power Cord; Denmark
7-2 1339521 1 Power Cord; Israel
7-2 1339524 1 Power Cord; Italy
7-2 70G0496 1 Power Cord; Japan
7-2 1339517 1 Power Cord; Saudi Arabia
7-2 1339523 1 Power Cord; South Africa
7-2 1339522 1 Power Cord; Switzerland
7-3 69G8381 1 Fuse, 125 V ac, 5 A
7-3 69G9976 1 Fuse, 250 V ac, 3.15 A
7-3 11A7457 1 Fuse, 125 V ac, 6.3 A
7-4 69G9972 1 Rear Frame
7-5 4 Screw, Type 3504 PP 69G9974
7-6 2 Screw, Type 3907 PP 69G9974
7-7 1 Screw, Type 4307 PP 69G9974
7-8 69G8356 1 Cover, High Voltage Power Supply
7-9 4 Screw, Type 3704 PP 69G9974
7-10 69G8383 1 Board, HVPS 06A/06B/06D/06J/070
7-10 11A7400 1 Board, HVPS 06C/06F/071
7-10A 11A7410 1 Cable, HVPS to Engine Board
7-11 69G8385 1 Cable, 2nd Paper Drawer
Parts Catalog 6-23

4026-0XX
Assembly 7: Electronics (continued)
6-24
4026-0XX
Asm- Part
Units Description
Index Number
7-15 11A7417 1 Terminal, Rear Frame Ground to Control Card
Cage
7-12 2 Screw, shouldered cable mtg. PP 69G9974
7-13 11A7406 1 Cable, Transfer Assembly to HVPS
7-14 1 Screw, Type 3501 PP 69G9974
7-16 11A7418 1 Cover, LVPS Edge
7-17 69G9985 1 Controller Board Cage
7-18 69G8386 1 Controller Board Bracket W/O Cage
7-19 11A7439 1 Controller Board W/O ROM SIMM includes
Print Registration Diskette 06A/06B/06C/06F/
06J
7-19 69G8262 1 Controller Board W/O ROM SIMM includes
Print Registration Diskette 06D/070/071
7-19A 11A7433 2 Screw, 4/40 Controller Board to Board Cage
7-20 69G9983 1 ROM SIMM 06A/06J
7-20 69G9984 1 ROM SIMM w/Flash 06B
7-20 11A7296 1 ROM SIMM 06C/070/071
7-20 11A7272 1 ROM SIMM 06D
7-20 11A7300 1 ROM SIMM w/Flash 06F
7-21 6 Screw, Type 3501 PP 69G9974
7-22 69G8384 1 Engine Board 06A/06B/06D/06J
7-22 11A7451 1 Engine Board 06C/06F
7-22 11A7762 1 Engine Board 070/071
Parts Catalog 6-25

4026-0XX
Assembly 8: Transfer Assembly
6-26
Asm- Part
Units Description
Index Number
8-1 69G8307 1 Transfer Assembly 06A/06B/06D/06J/070
8-1 11A7452 1 Transfer Assembly 06C/06F/071
8-2 69G8310 1 Right Transfer Frame Guide 06A/06B/06D/06J/
070
8-3 2 Screw, Type 3704 PP 69G9974 06A/06B/06D/
06J/070
8-4 69G9987 1 Spring, Right Transfer Guide 06A/06B/06D/
06J/070 PP
8-5 69G9968 1 Transfer Corona Assembly 06A/06B/06D/06J/
070
8-6 69G9987 1 Spring, Left Transfer Guide 06A/06B/06D/06J/
070 PP
8-7 69G8308 1 Left Transfer Frame Guide 06A/06B/06D/06J/
070
8-8 69G8309 1 Gear, 18/21T 06A/06B/06D/06J/070
8-9 11A7453 1 Gear, 18/21T 06C/06F/071
8-10 11A7383 1 Spring, Pressure 06C/06F/071
Parts Catalog 6-27

4026-0XX
Assembly 9: Option - Second Paper Drawer
6-28
4026-0XX
Asm- Part
Units Description
Index Number
9-1 69G9929 1 Frame, Base
9-2 69G9927 2 Foot, square rubber
9-2A 11A7416 2 Foot, round rubber
9-3 7 Screw, Type 3704 PP 11A7434
9-4 69G9926 1 Right Side Cover
9-5 69G9937 1 Lift Plate Assembly
9-6 69G9928 1 Tray, Paper
9-6A 11A7428 1 Pad
9-6B 11A7429 1 Label, Paper Set
9-7 69G9933 1 Adjustable Paper Guide
9-7A 11A7430 1 Regulating Plate, paper guide
9-8 69G9938 1 Spring, Lift Plate
9-9 69G9925 1 Left Side Cover
9-10 69G9931 1 Bracket, Roller
9-11 1 Spring, PP 11A7436
9-12 69G9930 1 Roller
Parts Catalog 6-29

4026-0XX
Assembly 9: Option - Second Paper Drawer (continued)
6-30
4026-0XX
Asm- Part
Units Description
Index Number
9-14 2 Screw, Type 1305 PP 11A7434
9-15 69G9942 1 Stud, Solenoid Mounting
9-16 69G9965 1 Lever, Lift Plate Release
9-17 1 C-Clip, Type 9105 PP 69G9986
9-18 2 Screw, Type 3504 PP 11A7434
9-19 69G8370 1 Solenoid
9-20 69G9958 1 Lever, Knockoff
9-21 69G9963 1 Button, Lift Plate Release
9-22 5 C-Clip, Type 9107 PP 69G9986
9-23 1 Spring, Lift Plate Release Button PP 11A7436
9-24 69G9943 1 Bracket
9-25 69G9945 1 Gear, 13/45T
9-26 1 Spring, Torsion Release Lever PP 11A7436
9-27 69G9944 1 Gear, 41T
9-28 69G9946 1 Clutch Assembly, complete
9-28A 69G9947 1 Gear, 28T
9-28B 1 Spring, Clutch PP 11A7436
9-28C 69G9949 1 Ratchet
9-28D 11A7414 1 Collar, clutch
9-29 69G9955 1 Shaft, D-Roll
9-30 69G9991 1 Pin, D-Roll Shaft
9-31 69G9957 3 Bushing, D-Roll Shaft
9-32 69G9956 1 D-Roll
9-33 69G9953 1 Gear, 14T
9-34 69G9950 1 Paper Feed Shaft W/Roller
9-35 69G9951 1 Bushing, Paper Feed Shaft, Inside
Parts Catalog 6-31

4026-0XX
Assembly 9: Option - Second Paper Drawer (continued)
6-32
4026-0XX
Asm- Part
Units Description
Index Number
9-37 69G9959 1 Bracket, Sensor Flag
9-38 69G9960 1 Sensor Flag
9-39 69G9935 1 Ground Terminal
9-40 4 Screw, Type 3501 PP 11A7434
9-41 69G9934 1 Sensor/Interface Board
9-42 69G9940 1 Cover, Front.
9-43 69G9939 1 Paper Feed Assembly, complete
9-44 11A7427 1 Guide Plate
Parts Catalog 6-33

Assembly 10: Options
Asm- Part
Units Description
Index Number
10 1364936 1 Memory SIMM, 1MB
10 1368706 1 Serial Adapter
10 12G0116 1 Printer Cable, Macintosh
6-34
4026-0XX
Assembly 11: Miscellaneous
Asm- Part
Units Description
Index Number
11 69G9986 1 Parts Packet, C-Clips for printer and Second
Paper Drawer
11 69G9987 1 Parts Packet, Springs
11 69G9988 1 Parts Packet, Fuser Gears
11 69G9989 1 Parts Packet, Paper Feed Gears
11 69G9974 1 Parts Packet, Screws
11 11A7436 1 Parts Packet, Second Paper Drawer Springs
11 11A7434 1 Parts Packet, Second Paper Drawer Screws
Parts Catalog 6-35

4026-0XX
Index 2
A G
Acronyms 1-2 General Information 1-1
Adjustment Procedure 4-2
H
Print Registration 4-2
Handling ESD-sensitive Parts 4-1
C Hex Trace 3-12
Configuration Mode 3-10 How To Use This Parts Catalog 6-1
Connector Locations HVPS Connectors 5-2
Controller Board 5-7
Engine Board 5-3 L
High Voltage Power Supply 5-2
LVPS Connectors 5-1
Low Voltage Power Supply 5-1
Paper Entry Sensor 5-11 M
Paper Exit Sensor 5-11
Paper Feed Solenoid 5-11 Maintenance Approach 1-1
Second Paper Tray Option 5-7 Miscellaneous 6-35
Controller Board Connectors 5-7
O
Covers 6-2, 6-4
Options 1-1, 6-34
D
P
Diagnostic Aids 3-1
Diagnostic Information 2-1 Paper Feed Frame 6-16
Diagnostic Tests 3-3 Paper Feed Input Tray 6-14
Hex Trace 3-12 Paper Feed Timing 3-8
Printer Diagnostic Test 3-3 Parts Catalog
Service Diagnostic Test Page Covers 6-2
3-4 Electronics 6-22
User Mode Print Test Page 3-6 Frame 6-6
E Fuser 6-18
Miscellaneous 6-35
Electronics 6-22, 6-24 Options 6-34
Engine Board Connectors 5-3 Paper Feed Frame 6-16
ESD-sensitive Parts 4-1 Paper Feed Input Tray 6-14
Printhead 6-12
F Second Drawer 6-28
Frame 6-6, 6-8, 6-10 POST Symptom Table 2-12
Fuser 6-18 Power-on Self Test 2-10, 3-1
Fuser Operation 3-9 Print Registration Adjustment 4-2
Printer Diagnostic Test 3-3
Printhead 6-12
X-1
4026-0XX
R S
Removal Procedures 4-3 Screw Identification Table 4-3
Removals Second Drawer 6-28, 6-30, 6-32
Board Cage 4-4 Second Paper Drawer 2-28
Controller Board 4-5
Service Checks 2-15
Covers 4-4
D-Roll 4-6 Charge Brush 2-15
Engine Board 4-6 Cold Fuser 2-18
Exit Paper Feed Roller Asm 4-7 Cover Interlock 2-16
Exit Sensor 4-6 D-Roll Assembly 2-16
Exit Sensor Flag 4-6 Exit Sensor 2-17
Fan 4-7 Fan 2-17
Fuser Lamp 4-7 Hot Fuser 2-20
Fuser Lower Frame Asm 4-8 Input Sensor 2-20
Fuser Paper Separator 4-8 Low Voltage Power Supply 2-22
Fuser Upper Frame Asm 4-8 Main Motor 2-25
HVPS Board 4-9 Operator Panel 2-27
HVPS Cover 4-9 Paper Feed 2-34
Left Side Plate 4-9 Paper Feed Frame Asm 2-37
LVPS 4-10 Paper Take-Up Solenoid 2-32
Main Drive Motor 4-10 Parallel Port 2-34
Main Drive/Paper Feed Gears Print Quality 2-38
4-10 Registration 2-44
Manual Paper Feed Plate 4-10 ROM SIMM 2-45
Operator Panel 4-11 Second Paper Drawer 2-28
Paper Entry Sensor 4-11 Transfer Assembly 2-44
Paper Entry Sensor Flag 4-11 Transfer Corona 2-45
Paper Feed Frame Asm 4-12 Service Diagnostic Test Page 3-4
Paper Feed Solenoid 4-12 Service Error Codes 2-2
Paper Guide Plate Asm 4-12
Start 2-1
Paper Lift Plate Asm 4-12
Paper Separator 4-13 Symptom Table 2-13
Print Media Selection Lever
4-13 U
Printhead 4-13 Unique Tools 1-1
Second Drawer Connector 4-13
User Error Messages 2-6
Thermal Fuse 4-14
Thermistor 4-14 User Mode Print Test Page 3-6
Thermostat 4-14 User Secondary Error Messages 2-8
Transfer Asm 4-14
Restoring Factory Defaults 3-13
X-2

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Optra™ E

• Safety and Notices

Lexmark and Optra are trademarks of

Third Edition (April 1997)

This publication could include technical inaccuracies or typographical errors.

Comments may be addressed to Lexmark International, Inc., D22A/035-3,

Other trademarks are the property of their respective owners.

 Copyright Lexmark International, Inc. 1995, 1997

UNITED STATES GOVERNMENT RESTRICTED RIGHTS

Notices and Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . .vi

Removal Procedures (continued)

Notices and Safety Information

Class I laser products are not considered to be hazardous. The

CLASS 1 LASER PRODUCT

Notices and Safety Information vii

viii Service Manual

Laserprodukte der Klasse I gelten als unschädlich. Im Inneren des

Avis relatif à l’utilisation de laser

Les produits laser de Classe I sont considérés comme des produits

Notices and Safety Information ix

Avvertenze sui prodotti laser

I prodotti laser di classe non sono considerati pericolosi. La

Avisos sobre el láser

Los productos láser de Clase I no se consideran peligrosos. La

Declaração sobre Laser

Os produtos laser da Classe I não são considerados perigosos.

Laserprodukten van klasse I worden niet als ongevaarlijk

Notices and Safety Information xi

Klasse I-laserprodukter betragtes ikke som farlige. Printeren

Luokan I laserlaitteiden ei katsota olevan vaarallisia käyttäjälle.

VARO! Avattaessa ja suojalukitus ohitettaessa olet alttiina

VARNING! Osynlig laserstrålning när denna del är öppnad och

xii Service Manual

Laserprodukter i Klass I anses ej hälsovådliga. Skrivaren har en

Klasse I-laserprodukter er ikke å betrakte som farlige. Skriveren

Notices and Safety Information xiii

Avís sobre el Làser

Els productes làser de classe I no es consideren perillosos. Aquesta

xiv Service Manual

Japanese Laser Notice

Chinese Laser Notice

Notices and Safety Information xv

Korean Laser Notice

xvi Service Manual

• Während des Auseinandernehmens und der Wartung des

Notices and Safety Information xvii

personales durante el desmontaje y la reparación de la

xviii Service Manual

Chinese Safety Information

Korean Safety Information

Notices and Safety Information xix

This manual is divided into the following chapters:

• “General Information” contains a general description of the

This printer is a letter-quality page printer designed to attach to an

The printer is available in models 4026-06A, 06C, 06D, and 06J

The model 4026-070 printer includes a manual input guide,

Tools Required For Service

General Information 1-1

Remove power from the printer before you connect or disconnect

If a service error code appears while you are working on the