LHC 6230 P
LHC 6230 P
LHC 6230 P
MODELS : LH-C6230P/C6231P/LH-C6230S/LH-C6230W/LH-C6231W/LH-C6230X/LH-C6230Y/C6231Y
DVD/CD/VCR RECEIVER
Home Cinema System
SERVICE MANUAL
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SECTION 1. GENERAL PART
PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS
CAUTION : DO NOT ATTEMPT TO MODIFY THIS PRODUCT IN ANY WAY, SUBJECT : X-RADIATION
NEVER PERFORM CUSTOMIZED INSTALLATIONS WITHOUT MANUFAC- 1. BE SURE PROCEDURES AND INSTRUCTIONS TO ALL SERVICE PER-
TURER S APPROVAL. UNAUTHORIZED MODIFICATIONS WILL NOT ONLY SONNEL COVER THE SUBJECT OF X-RADIATION. THE ONLY POTEN-
VOID THE WARRANTY, BUT MAY LEAD TO YOUR BEING LIABLE FOR ANY TIAL SOURCE OF X-RAYS IN CURRENT T.V. RECEIVERS IS THE PIC-
RESULTING PROPERTY DAMAGE OR USER INJURY. TURE TUBE. HOWEVER, THIS TUBE DOES NOT EMIT X-RAYS WHEN
SERVICE WORK SHOULD BE PERFORMED ONLY AFTER YOU ARE THE HIGH VOLTAGE IS AT THE FACTORY SPECIFIED LEVEL. THE
THOROUGHLY FAMILIAR WITH ALL OF THE FOLLOWING SAFETY PROPER VALUE IS GIVEN IN THE APPLICABLE SCHEMATIC. OPERA-
CHECKS AND SERVICING GUIDELINES. TO DO OTHERWISE, TION AT HIGHER VOLTAGES MAY CAUSE A FAILURE OF THE PIC-
INCREASES THE RISK OF POTENTIAL HAZARDS AND INJURY TO THE TURE TUBE OR HIGH VOLTAGE SUPPLY AND, UNDER CERTAIN CIR-
USER. CUMSTANCES, MAY PRODUCE RADIATION IN EXCESS OF DESIR-
WHILE SERVICING, USE AN ISOLATION TRANSFORMER FOR PROTEC- ABLE LEVELS.
TION FROM A.C. LINE SHOCK. 2. ONLY FACTORY SPECIFIED C.R.T. ANODE CONNECTORS MUST BE
USED. DEGAUSSING SHIELDS ALSO SERVE AS X-RAY SHIELD IN
SAFETY CHECKS COLOR SETS, ALWAYS RE-INSTALL THEM.
AFTER THE ORIGINAL SERVICE PROBLEM HAS BEEN CORRCTED. A 3. IT IS ESSNTIAL THAT SERVICE PERSONNEL HAVE AVAILABLE AN
CHECK SHOULD BE MADE OF THE FOLLOWING. ACCURATE AND RELIABLE HIGH VOLTAGE METER. THE CALIBRA
SUBJECT : FIRE & SHOCK HAZARD TION OF THE METER SHOULD BE CHECKED PERIODICALLY
1. BE SURE THAT ALL COMPONENTS ARE POSITIONED IN SUCH A WAY AGAINST A REFERENCE STANDARD, SUCH AS THE ONE AVAILABLE
AS TO AVOID POSSIBILITY OF ADJACENT COMPONENT SHORTS. AT YOUR DISTRIBUTOR.
THIS IS ESPECIALLY IMPORTANT ON THOSE MODULES WHICH ARE 4. WHEN THE HIGH VOLTAGE CIRCUITRY IS OPERATING PROPERLY
TRANSPORTED TO AND FROM THE REPAIR SHOP. THERE IS NO POSSIBILITY OF AN X-RADIATION PROBLEM. EVERY
2. NEVER RELEASE A REPAIR UNLESS ALL PROTECTIVE DEVICES TIME A COLOR CHASSIS IS SERVICED. THE BRIGHTNESS SHOULD
SUCH AS INSULATORS, BARRIERS, COVERS, SHIELDS, STRAIN BE RUN UP AND DOWN WHILE MONITORING THE HIGH VOLTAGE
RELIEFS, POWER SUPPLY CORDS, AND OTHER HARDWARE HAVE WITH A METER TO BE CERTAIN THAT THE HIGH VOLTAGE DOES
BEEN REINSTALLED PER ORIGINAL DESIGN. BE SURE THAT THE NOT EXCEED THE SPECIFIED VALUE AND THAT IT IS REGULATING
SAFETY PURPOSE OF THE POLARIZED LINE PLUG HAS NOT BEEN CORRECTLY, WE SUGGEST THAT YOU AND YOUR SERVICE ORGA-
DEFEATED. NIZATION REVIEW TEST PROCEDURES SO THAT VOLTAGE REGU-
LATION IS ALWAYS CHECKED AS A STANDARD SERVICING PROCE-
3. SOLDERING MUST BE INSPECTED TO DISCOVER POSSIBLE COLD DURE. AND THAT THE HIGH VOLTAGE READING BE RECORDER ON
SOLDER JOINTS, SOLDER SPLASHES OR SHARP SOLDER POINTS. EACH CUSTOMER S INVOICE.
BE CERTAIN TO REMOVE ALL LOOSE FOREIGN PARTICLES.
5. WHEN TROUBLESHOOTING AND MAKING TEST MEASUREMENTS IN
4. CHECK FOR PHYSICAL EVIDENCE OF DAMAGE OR DETERIORATION A PRODUCT WITH A PROBLEM OF EXCESSIVE HIGH VOLTAGE,
TO PARTS AND COMPONENTS. FOR FRAYED LEADS, DAMAGED AVOID BEING UNNECESSARILY CLOSE TO THE PICTURE TUBE AND
INSULATION (INCLUDING A.C. CORD). AND REPLACE IF NECESSARY THE HIGH VOLTAGE SUPPLY. DO NOT OPERATE THE PRODUCT
FOLLOW ORIGINAL LAYOUT, LEAD LENGTH AND DRESS. LONGER THAN IS NECESSARY TO LOCATE THE CAUSE OF EXCES
5. NO LEAD OR COMPONENT SHOULD TOUCH A RECIVING TUBE OR SIVE VOLTAGE.
A RESISTOR RATED AT 1 WATT OR MORE. LEAD TENSION AROUND 6. REFER TO HV. B+ AND SHUTDOWN ADJUSTMENT PROCEDURES
PROTRUNING METAL SURFACES MUST BE AVOIDED. DESCRIBED IN THE APPROPRIATE SCHEMATIC AND DIAGRAMS
6. ALL CRITICAL COMPONENTS SUCH AS FUSES, FLAMEPROOF (WHERE USED).
RESISTORS, CAPACITORS, ETC. MUST BE REPLACED WITH EXACT SUBJECT: IMPLOSION
FACTORY TYPES, DO NOT USE REPLACEMENT COMPONENTS
OTHER THAN THOSE SPECIFIED OR MAKE UNRECOMMENDED CIR- 1. ALL DIRECT VIEWED PICTURE TUBES ARE EQUIPPED WITH AN INTE
CUIT MODIFICATIONS. GRAL IMPLOSION PROTECTION SYSTEM, BUT CARE SHOULD BE
TAKEN TO AVOID DAMAGE DURING INSTALLATION, AVOID
7. AFTER RE-ASSEMBLY OF THE SET ALWAYS PERFORM AN A.C. SCRATCHING THE TUBE. IF SCRATCHED REPLACE IT.
LEAKAGE TEST ON ALL EXPOSED METALLIC PARTS OF THE CABI-
NET, (THE CHANNEL SELECTOR KNOB, ANTENNA TERMINALS. HAN- 2. USE ONLY RECOMMENDED FACTORY REPLACEMENT TUBES.
DLE AND SCREWS) TO BE SURE THE SET IS SAFE TO OPERATE SUBJECT : TIPS ON PROPER INSTALLATION
WITHOUT DANGER OF ELECTRICAL SHOCK. DO NOT USE A LINE 1. NEVER INSTALL ANY PRODUCT IN A CLOSED-IN RECESS, CUBBY-
ISOLATION TRANSFORMER DURING THIS TEST USE AN A.C. VOLT- HOLE OR CLOSELY FITTING SHELF SPACE. OVER OR CLOSE TO
METER, HAVING 5000 OHMS PER VOLT OR MORE SENSITIVITY, IN HEAT DUCT, OR IN THE PATH OF HEATED AIR FLOW.
THE FOLLOWING MANNER; CONNECT A 1500 OHM 10 WATT RESIS-
TOR, PARALLELED BY A .15 MFD. 150.V A.C TYPE CAPACITOR 2. AVOID CONDITIONS OF HIGH HUMIDITY SUCH AS: OUTDOOR PATIO
BETWEEN A KNOWN GOOD EARTH GROUND (WATER PIPE, CON- INSTALLATIONS WHERE DEW IS A FACTOR, NEAR STEAM RADIA-
DUIT, ETC.) AND THE EXPOSED METALLIC PARTS, ONE AT A TIME. TORS WHERE STEAM LEAKAGE IS A FACTOR, ETC.
MEASURE THE A.C. VOLTAGE ACROSS THE COMBINATION OF 1500 3. AVOID PALCEMENT WHERE DRAPERIES MAY OBSTRUCT REAR
OHM RESISTOR AND .15 MFD CAPACITOR. REVERSE THE A.C. PLUG VENTING. THE CUSTOMER SHOULD ALSO AVOID THE USE OF DEC-
AND REPEAT A.C. VOLTAGE MEASUREMENTS FOR EACH EXPOSED ORATIVE SCARVES OR OTHER COVERINGS WHICH MIGHT
METALLIC PART. VOLTAGE MEASURED MUST NOT EXCEED 75 OBSTRUCT VENTILATION.
VOLTS R.M.S. THIS CORRESPONDS TO 0.5 MILLIAMP A.C ANY
4. WALL AND SHELF MOUNTED INSTALLATIONS USING A COMMER-
VALUE EXCEEDING THIS LIMIT CONSTITUTES A POTENTIAL SHOCK
CIAL MOUNTING KIT. MUST FOLLOW THE FACTORY APPROVED
HAZARD AND MUST BE CORRECTED IMMEDIATELY.
MOUNTING INSTRUCTIONS A PRODUCT MOUNTED TO A SHELF OR
A.C. VOLTMETER PLATFORM MUST RETAIN ITS ORIGINAL FEET (OR THE EQUIVALENT
THICKNESS IN SPACERS) TO PROVIDE ADEQUATE AIR FLOW
ACROSS THE BOTTOM, BOLTS OR SCREWS USED FOR FASTENERS
MUST NOT TOUCH ANY PARTS OR WIRING. PERFORM LEAKAGE
TEST ON CUSTOMIZED INSTALLATIONS.
5. CAUTION CUSTOMERS AGAINST THE MOUNTING OF A PRODUCT ON
SLOPING SHELF OR A TILTED POSITION, UNLESS THE PRODUCT IS
PROPERLY SECURED.
GOOD EARTH GROUND PLACE THIS PROBE 6. A PRODUCT ON A ROLL-ABOUT CART SHOULD BE STABLE ON ITS
SUCH AS THE WATER ON EACH EXPOSED MOUNTING TO THE CART. CAUTION THE CUSTOMER ON THE HAZ-
PIPE. CONDUIT. ETC METAL PART ARDS OF TRYING TO ROLL A CART WITH SMALL CASTERS ACROSS
THRESHOLDS OR DEEP PILE CARPETS.
7. CAUTION CUSTOMERS AGAINST THE USE OF A CART OR STAND
SUBJECT: GRAPHIC SYMBOLS WHICH HAS NOT BEEN LISTED BY UNDERWRITERS LABORATORIES,
THE LIGHTNING FLASH WITH APROWHEAD SYMBOL. WITHIN INC. FOR USE WITH THEIR SPECIFIC MODEL OF TELEVISION
AN EQUILATERAL TRIANGLE, IS INTENDED TO ALERT THE RECEIVER OR GENERICALLY APPROVED FOR USE WITH T.V. S OF
SERVICE PERSONNEL TO THE PRESENCE OF UNINSULATED THE SAME OR LARGER SCREEN SIZE.
DANGEROUS VOLTAGE THAT MAY BE OF SUFFICIENT MAG-
8. CAUTION CUSTOMERS AGAINST THE USE OF EXTENSION CORDS,
NITUDE TO CONSTITUTE A RISK OF ELECTRIC SHOCK.
EXPLAIN THAT A FOREST OF EXTENSIONS SPROUTING FROM A SIN-
THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIAN- GLE OUTLET CAN LEAD TO DISASTROUS CONSEQUENCES TO
GLE IS INTENDED TO ALERT THE SERVICE PERSONNEL TO HOME AND FAMILY.
THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN
SERVICE LITERATURE.
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NOTES REGARDING HANDLING OF THE PICK-UP
1. Notes for transport and storage
1) The pick-up should always be left in its conductive bag until immediately prior to use.
2) The pick-up should never be subjected to external pressure or impact.
2. Repair notes
1) The pick-up incorporates a strong magnet, and so should never be brought close to magnetic materials.
2) The pick-up should always be handled correctly and carefully, taking care to avoid external pressure and
impact. If it is subjected to strong pressure or impact, the result may be an operational malfunction and/or
damage to the printed-circuit board.
3) Each and every pick-up is already individually adjusted to a high degree of precision, and for that reason
the adjustment point and installation screws should absolutely never be touched.
4) Laser beams may damage the eyes!
Absolutely never permit laser beams to enter the eyes!
Also NEVER switch ON the power to the laser output part (lens, etc.) of the pick-up if it is damaged.
Magnet Pressure
Pressure
Conductive Sheet
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NOTES REGARDING COMPACT DISC PLAYER REPAIRS
1. Preparations
1) Compact disc players incorporate a great many ICs as well as the pick-up (laser diode). These
components are sensitive to, and easily affected by, static electricity. If such static electricity is high
voltage, components can be damaged, and for that reason components should be handled with care.
2) The pick-up is composed of many optical components and other high-precision components. Care must
be taken, therefore, to avoid repair or storage where the temperature of humidity is high, where strong
magnetism is present, or where there is excessive dust.
Armband
Resistor
(1 Mohm)
Resistor
Conductive
(1 Mohm)
Sheet
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SERVICING PRECAUTIONS
CAUTION : Before servicing the COMBI HOME THEATER Electrostatically Sensitive (ES) Devices
SYSTEM covered by this service data and its supplements Some semiconductor (solid state) devices can be damaged
and addends, read and follow the SAFETY PRECAUTIONS. easily by static electricity. Such components commonly are
NOTE : if unforeseen circumstances create conflict between called Electrostatically Sensitive (ES) Devices. Examples of
the following servicing precautions and any of the safety pre- typical ES devices are integrated circuits and some field
cautions in this publications, always follow the safety pre- effect transistors and semiconductor chip components.
cautions. The following techniques should be used to help reduce the
Remembers Safety First: incidence of component damage caused by static electricity.
2. Do not spray chemicals on or near this COMBI HOME 3. Use only a grouned-tip soldering iron to solder or unsolder
THEATER SYSTEM or any of its assemblies. ES devices.
3. Unless specified otherwise in this service data, clean 4. Use only an anti-static solder removal device. Some
electrical contacts by applying an appropriate contact solder removal devices not classified a anti-static can
cleaning solution to the contacts with a pipe cleaner, generate electrical charges sufficient to damage ES
cotton-tipped swab, or comparable soft applicator. devices.
Unless specified otherwise in this service data, lubrication
of contacts is not required. 5. Do not use freon-propelled chemicals. These can
generate electrical charge sufficient to damage ES
4. Do not defeat any plug/socket B+ voltage interlocks with devices.
whitch instruments covered by this service manual might
be equipped. 6. Do not remove a replacement ES device from its protec
tive package until immediately before you are ready to
5. Do not apply AC power to this COMBI HOME THEATER install it. (Most replacement ES devices are packaged with
SYSTEM and/or any of its electrical assemblies unless all leads electrically shorted together by conductive foam,
solid-state device heat sinks are cerrectly installed. aluminum foil, or comparable conductive material).
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ESD PRECAUTIONS
Electrostatically Sensitive Devices (ESD)
Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components
commonly are called Electrostatically Sensitive Devices (ESD). Examples of typical ESD devices are integrated
circuits and some field-effect transistors and semiconductor chip components. The following techniques should
be used to help reduce the incidence of component damage caused by static electricity.
1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off
any electrostatic charge on your body by touching a known earth ground. Alternatively, obtain and wear a
commercially available discharging wrist strap device, which should be removed for potential shock reasons
prior to applying power to the unit under test.
2. After removing an electrical assembly equipped with ESD devices, place the assembly on a conductive
surface such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly.
3. Use only a grounded-tip soldering iron to solder or unsolder ESD devices.
4. Use only an anti-static solder removal device. Some solder removal devices not classified as "anti-static" can
generate electrical charges sufficient to damage ESD devices.
5. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ESD
devices.
6. Do not remove a replacement ESD device from its protective package until immediately before you are ready
to install it. (Most replacement ESD devices are packaged with leads electrically shorted together by
conductive foam, aluminum foil or comparable conductive materials).
7. Immediately before removing the protective material from the leads of a replacement ESD device, touch the
protective material to the chassis or circuit assembly into which the device will by installed.
CAUTION : BE SURE NO POWER IS APPLIED TO THE CHASSIS OR CIRCUIT, AND OBSERVE ALL OTHER
SAFETY PRECAUTIONS.
8. Minimize bodily motions when handing unpackaged replacement ESD devices. (Otherwise harmless motion
such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can
generate static electricity sufficient to damage an ESD device).
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SPECIFICATIONS
General
Power requirements AC230V ~ , 50 Hz
Power consumption 130 W
Dimensions (approx.) 430 X 90 X 350 mm (w x h x d)
Mass (approx.) 8 kg (17.6 lbs)
Operating temperature 5ßC to 40ßC (41ßF to 104ßF )
Timer 24-hour display type
Operating humidity 5 % to 90 %
DVD Section
Laser Semiconductor laser, wavelength 650 nm
Signal system PAL/NTSC
Frequency response DVD (PCM 96 kHz): 8 Hz to 44 kHz
DVD (PCM 48 kHz): 8 Hz to 20 kHz
CD: 8 Hz to 20 kHz
Signal-to-noise ratio More than 65 dB (ANALOG OUT connectors only)
Harmonic distortion Less than 1.0%
Dynamic range More than 60 dB (DVD)
More than 60 dB (CD)
Outputs
S-VIDEO OUT (Y) 1.0 V (p-p), 75 ohms, negative sync, Mini DIN 4-pin x 1
(C) 0.3 V (p-p) 75 ohms
VCR Section
Head system 4 heads helical scan azimuth system
Maximum recording time SP: 4 h (E-240 tape), LP: 8 h (E-240 tape)
Rewind time About 180 min (E-180 tape)
Input level VIDEO: 1.0 V(p-p), 75 ohms, unbalanced
AUDIO: -6.0 dBm, more than 10 kohms (SCART)
-6.0 dBm, more than 47 kohms (RCA)
Output level VIDEO: 1.0 V(p-p), 75 ohms, unbalanced
Signal-to-noise ratio VIDEO: More than 43 dB
AUDIO: More than 72 dB (Hi-Fi)
More than 42 dB (Mono)
Dynamic range AUDIO: More than 85 dB
Tuner Section
Tuning range FM: 87.5 - 108.0 MHz
AM: 522 - 1611 kHz
Intermediate frequency FM: 10.7 MHz
AM: 450 kHz
Amplifier Section
Stereo mode 20W + 20W (4 ohm at 1 kHz, THD 10%)
Surround mode Front: 20W + 20W (THD 10%)
Centre: 20W
Surround: 20W + 20W (4 ohm at 1 kHz, THD 10%)
Subwoofer: 40W (8 ohm at 30 Hz, THD 10%)
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Speakers
Satellite (LHS-C6230T)
Type 1 Way 1 Speaker
Impedance 4‰
Frequency Response 130 - 20,000 Hz
Sound Pressure Level 83 dB/W (1m)
Rated Input Power 20W
Max Input Power 40W
Net Dimensions (W x H x D) 88 x 100 x 95 mm
Net Weight 0.54 kg
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SECTION 2. AUDIO PART
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SECTION 3. VCR PART
ELECTRICAL ADJUSTMENT PROCEDURES
1. Servo Adjustment
1) PG Adjustment
Test Equipment
V.Out
PLAY R/C TRK JIG KEY 6.5 – 0.5H
H/SW(W373, W374)
Adjustment Procedure
a) Insert the SP Test Tape and play.
Note - Adjust the distance of X, pressing the Tracking(+) or Tracking(-) when the ATR is blink after the
SP Test Tape is inserted.
b) Connect the CH1 of the oscilloscope to the H/SW(W373, W374) and CH2 to the Video Out for the VCR.
c) Trigger the mixed Combo Video Signal of CH2 to the CH1 H/SW(W373, W374), and then check the dis-
tance (time difference), which is from the selected A(B) Head point of the H/SW(W373, W374) signal to
the starting point of the vertical synchronized signal, to 6.5H – 0.5H (416 s, 1H=64 s).
PG Adjustment Method
a-1) Payback the SP standard tape
b-2) Press the 1 key on the Remote controller and the PLAY key on the Front Panel the same time,
then it goes in to Tracking initial mode. (Note : PAL Model 1 key on Remote controller)
c-3) Repeat the above step(No.b-2), then it finishes the PG adjusting automatically.
d-4) Stop the playback, then it goes out to PG adjusting mode after mony the PG data.
CONNECTION
V.Out
OSCILLOSCOPE
CH1 CH2
H/SW(W373,W374)
R/C KEY
H/SW V.out
(W373, W374)
WAVEFORM
H/SW
Composite
VIDEO
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VCR ELECTRICAL TROULBESHOOTING
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2. SYSTEM/KEY CIRCUIT
(1) AUTO STOP
Auto Stop
YES
Does the SW25 waveform NO Check the Drum Motor
appear at the IC501
Pin105? signal.
YES
NO Do T/UP Reel Pulses NO
Do the T-UP Reel Pulses Does 5.2V appear at the
appear at the Q514
appear at the IC501 Pin49? RS501?
Base terminal ?
YES YES YES NO
YES
YES
Does the H signal appear NO Is 5.3V applied to the
at the IC501 Pin30 during
R544 ?
inserting the CST ?
YES NO
YES
Does the L signal appear
Check the CST SW and Refer to SMPS 5.3VA
at the IC501 Pin72 during
the peripheral circuitry. troubleshooting.
inserting the CST?
NO
YES
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3. SERVO CIRCUIT
(1) Unstable Video in PB MODE
Unstable Video in
PB Mode.
YES
Does the Noise level of the
screen change
periodically?
YES
YES
Does the Video Envelope NO Refer to When the Y signal
waveform appear at the doesn t appear on the
IC501 Pin24? screen in PB Mode .
YES
Refer to (2)
Replace the IC501.
No 12VA of Power section
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(3) When the Capstan Motor doesn t run,
NO Refer to SMPS(CAPSTAN/12Volt)
Does 12VA appear at the PMC01?
Trouble Shooting .
YES
NO
YES
Check the PMC01 and the Capstan Does the PWM signal appear at the
Motor Ass y. IC501 Pin108?
YES
NO
Aren t the foil patterns and Components Does the CFG signal appear at the
between IC501 Pin108 and PMC01
Pin9 short? PMC01 Pin1?
YES
NO
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(4) KEY doesn t working
YES
Does LED or FLD change NO Replace the defective
when a function button is
switches.
pressed?
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4. Y/C CIRCUIT
(1) No Video in EE Mode,
No Video in EE Mode
YES
YES
Does the Video signal NO Is I2C BUS signal applied to NO Check the System Circuit.
(Refer to SYSTEM I2C BUS
appear at the IC301 Pin65? the IC301 Pins68, 69? CHECK Trouble Shooting )
YES YES
YES YES
YES
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(2) When the Y(Luminance) signal doesn t appear on the screen in PB Mode,
YES
YES
Does the normal RF signal NO Is the V.H.S/W signal NO Check the System Circuit.
appear at the IC301 Pin78? applied to the IC301 Pin70? (IC501 Pin105)
YES
NO
Clean the Drum. Replace the IC301.
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(3) When the C(Color) signal doesn t appear on the screen in PB Mode,
YES
YES
YES
YES
YES
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(4) When the Video signal doesn t appear on the screen in REC Mode,
NO
Is the EE signal normal? Check EE Mode.
YES
YES
YES
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5. Hi-Fi CIRCUIT
(A) No Sound(EE Mode)
No Sound.
YES
YES
Check the Vcc of IC801 Pins34, 40,
NO Check the Power 5.2V, 12VT.
IC802 Pin4.
YES
YES
NO
Check the Audio of IC801 Pins16, 17. Replace IC801.
YES
NO
Check the Audio of IC802 Pins22, 26. Replace IC802.
YES
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(B) Hi-Fi Playback
PB mode
YES
No Sound.
YES
Is the RF Envelope at NO
IC801 Pin44 over 2Vp-p?
YES
Replace IC802.
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(C)
Hi-Fi REC.
YES
YES
NO
Check Vcc of IC801.(Pins34, 40) Check Power 5V, 12VT.
YES
NO
Check IC801 Pin42(Data), Pin43(CLOCK). Check ports of -COM.
YES
YES
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6. Tuner/IF CIRCUIT
(A) No Picture on the TV screen
No picture on the TV
screen
YES
YES YES
YES
YES
YES
Replace Tuner.
YES
YES
YES
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(B) No Sound
No Sound.
YES
YES
YES
NO
Check the oscillator of IC751 Pins5, 6. Replace X751
YES
YES
YES
YES
YES
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SECTION 5. DVD PART
DVD ELECTRICAL TROUBLESHOOTING
1. Test & debug flow
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DETAILS AND WAVEFORMS ON SYSTEM TEST
AND DEBUGGING
1. SYSTEM 27MHz CLOCK,RESET,FLASH R/W SIGNAL
1) MT1379 main clock is at 27MHz(X501)
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3) RS232 waveform during procedure(Downloading)
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2. SDRAM CLOCK
1) MT1379 main clock is at 27MHz(X501)
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2) Tray close waveform
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4. SLED CONTROL RELATED SIGNAL (NO DISC CONDITION)
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6. LASER POWER CONTROL RELATED SIGNAL
(NO DISC CONDITION)
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8. FOCUS ON WAVEFORM
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9. SPINDLE CONTROL WAVEFORM (NO DISC CONDITION)
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10. TRACKING CONTROL RELATED SIGNAL(System checking)
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11. RF WAVEFORM
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13. MT1379 VIDEO OUTPUT WAVEFORM
1) Full colorbar signal(CVBS)
2) Y
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3) C
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MEMO
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• SPEAKER
Satellite speaker
• MODEL: LHS-C6230T
853
862
854
852
861
851
A800
850
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Passive(Sub) Woofer
• MODEL: LHS-C6230W
852
861
854
855
853
851
- 7-4 -
2-2 2-3
2-4 2-5
2-6 2-7
2-8 2-9
2-10 2-11
[FRONT] [MAIN]
LOC. PART PIN NUM. STOP DVD PLAY LOC. PART PIN NUM. STOP DVD PLAY LOC. PART PIN NUM. STOP DVD PLAY LOC. PART PIN NUM. STOP DVD PLAY
IC501 LC87F57C 1 4.2 4.2 57 2.3 2.3 IC707 KIA7805 1 11.9 11.9 11 0 0
2 5 5 58 2.3 2.3 2 0 0 12 0 0
3 0 0 59 4.9 5 3 5 5 13 0 0
4 0 0 60 0 0 IC703 KIA7812 1 18.4 18.4 14 0 0
5 0 0 61 0 0 2 0 0 15 0 0
6 0 0 62 0 0 3 11.9 11.9 16 4.5 4.5
7 0 0 63 0 0 IC701 KIA7909 1 0 0 IC105 M60446AFP 5 5.2 5.2
8 0 0 64 4 4 2 -18.6 -18.6 30 -5.3 -5.3
9 5 5 3 -9 -9 42 5 5
10 0 0 IC702 KA7809 1 18.4 18.4 IC200 TDA7265 1 -18.7 -18.7
11 0 0 2 0 0 2 0 0
12 0 0 3 9 9 3 18.6 18.6
13 0 0 IC704 KA78R12 1 18.4 18.4 4 0 0
14 0 0 2 12 12 5 9.3 9.3
15 0 0 3 0 0 6 -18.6 -18.6
16 0 0 4 5 5 7 0 0
17 0 0 IC706 KIA7805 1 11 11 8 0 0
18 0 0 2 0 0 9 0 0
19 5 5 3 5 5 10 0 0
20 2.5 2.5 IC705 KIA7805 1 11 11 11 0 0
21 2.5 2.5 2 0 0 IC250 TDA7265 1 -18.7 -18.7
22 2.5 2.5 3 5 5 2 0 0
23 2.5 2.5 D507 D5402 ANODE -0.2 -0.2 3 18.6 18.6
24 5 5 CATHODE 11 11 4 0 0
25 2.5 2.5 D511 D5402 ANODE -0.2 -0.2 5 9.3 9.3
26 4.6 4.6 CATHODE 11 11 6 -18.6 -18.6
27 2.5 4.6 BD501 KBU6G 1 -18.6 -18.6 7 0 0
28 2.5 2.3 2 0 0 8 0 0
29 2.5 2.5 3 0 0 9 0 0
30 2 2.5 4 18.4 18.4 10 0 0
31 5 5 IC101 KIA4580 1 4.5 4.5 11 0 0
32 0 0 2 4.5 4.5 IC300 TDA7265 1 -18.7 -18.7
33 5 0 3 4.5 4.5 2 0 0
34 0 0 4 0 0 3 18.6 18.6
35 0 0 5 4.5 4.5 4 0 0
36 5 5 6 4.5 4.5 5 9.3 9.3
37 0 0 7 4.5 4.5 6 -18.6 -18.6
38 0 0 8 9 9 7 0 0
39 0 0 IC102 CS5331A 1 1.4 1.4 8 0 0
40 0 0 2 1.6 1.6 9 0 0
41 0 0 3 1.6 1.6 10 0 0
42 0 2.3 4 1.5 1.5 11 0 0
43 0 0 5 2.2 2.2 IC400 TDA7265 1 -18.7 -18.7
44 0 2.3 6 0 0 2 0 0
45 0 2.3 7 5 5 3 18.6 18.6
46 5 5 8 2.2 2.2 4 0 0
47 0.3 2.3 IC103 4052 1 0 0 5 9.3 9.3
48 0.3 2.3 2 0 0 6 -18.6 -18.6
49 2.5 2.3 3 0 0 7 0 0
50 0 2.3 4 0 0 8 0 0
51 4.4 4.4 5 0 0 9 0 0
52 0.3 0 6 0 0 10 0 0
53 5 5 7 -4.5 -4.5 11 0 0
54 0.3 0.5 8 0 0
55 0.3 0 9 0 0
56 0 0 10 0 0
2-12 2-13
2-14 2-15
2-16 2-17
2-18 2-19
2-20 2-21
3-17 3-18
3-19 3-20
3-21 3-22
3-23 3-24
3-25 3-26
3-27 3-28
3-29 3-30
3-31 3-32
3-33 3-34
3-35 3-36
5-21 5-22
5-23 5-24
5-25 5-26
5-27 5-28
5-29 5-30
5-31 5-32
5-33 5-34
A26
250
A45
265
285
A49
A46
300
A47
264
A42 321
320
A42B 260
267
A43
276
284
283
277
7-1 7-2
T:Top, B:Bottom
NOTE : When reassembly perform the
procedure in the reverse order.
1) When reassembling, confirm Mechanism and Mode
Switch Alignment Position (Refer to Page 4-13)
2) When disassembling, the Parts for Starting No. Should
be removed first.
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DECK MECHANISM DISASSEMBLY
Stator
(S2)
(S2)
(S3) Drum Motor
(S3)
Rotor
Carbon Brush
(S1)
(S1)
(S1)
H2
H1
Holder FPC
Fig. A-1
(Fig. B-1)
1. Drum Assembly (Fig. A-1-1)
1) Unplug the Drum FPC Connector.
2) Remove three Screws(S1) on bottom side and separate
the Drum assembly.
3) Unhook (H1), (H2) and separate the Holder FPC and
Cap FPC. Cap FPC
1-1. Drum Motor
1) Remove two Screws(S2) and disassemble the Stator of
the Drum Motor. Drum FPC
2) Remove two Screws(S3) and separate the Rotor of the
Drum Motor from the Drum Sub assembly. Holder FPC
NOTE
When reassembling, confirm (A) portion of the Drum Sub
assembly whether the Carbon Brush is in there or not. Figure in the opposite direction
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DECK MECHANISM DISASSEMBLY
(B’) (C)
(E)
(C1)
Lever Assembly S/W (Fig. A-2-7)
(H8)
Bracket Assembly L/D Motor
Spring Lever S/W (Fig. A-2-4)
(C’) (E’)
(D)
Opener Door
(Fig. A-2-3)
(H6)
Chassis
(A) (B)
Gear Assembly Rack F/L
(Fig. A-2-5)
Fig. A-2
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DECK MECHANISM DISASSEMBLY
2. Plate Top (Fig. A-2-1) 2) Unhook three Hooks(H3, H4, H5) on bottom side of the
1) Pull the (B) portion of the Plate Top back in direction of Chassis, lift up the Bracket Assembly L/M and disassem-
arrow and separate the right side of it. ble the Bracket Assembly L/D Motor.
2) pull the (B ) portion of the Plate Top back in direction of
arrow and separate the left side of it.
(Used tools : (-) type driver, anything tool with sharp (H4)
Bracket assembly L/M
(H3)
NOTE
(1) When reassembling, push the Plate Top after alignment
the two position(C), (C ) as below Fig. (H5)
(C’)
6. Gear Assembly Rack F/L (Fig. A-2-5)
(C) 1) Move the Gear Assembly Rack F/L in direction of
arrow(A) and unhook the Hook(H6) pulling back in front.
(B’)
(B) 2) Separate the Gear Rack F/L in direction of arrow(B).
NOTE
When reassembling, align the gear part of the Gear
Assembly Rack F/L with the Gear Drive as below Fig.
Gear Drive
2) Disassemble the right side of the Holder Assembly CST 8. Lever Assembly S/W(Fig. A-2-7)
from each guided hole of the Chassis. 1) Unhook the Hook(H8) in the left side of the Chassis and
remove the Lever Assembly S/W.
NOTE
When reassembling, insert the (E) part of the Holder Chassis
Assembly CST in the (E ) hole of the Chassis first and
assemble the left side of it.
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DECK MECHANISM DISASSEMBLY
Arm Assembly
Cleaner
(Fig. A-3-1)
(A)
(S4)
Head F/E
(Fig. A-3-2)
Chassis
Fig. A-3
9. Arm Assembly Cleaner (Fig. A-3-1) 11. Base Assembly A/C Head (Fig. A-3-3)
1) Breakaway the (A) portion as Fig. A-3-1 from the 1) Remove the Screw(S4) and lift the Base Assembly A/C
embossing of the Chassis, turn the Arm assembly Head up.
Cleaner to clockwise direction and lift it up.
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DECK MECHANISM DISASSEMBLY
Brake Assembly T
(Fig. A-4-1)
Spring Tension
Reel S
(Fig. A-4-4) Reel T
(Fig. A-4-4)
Spring RS
Brake Assembly RS
(Fig. A-4-2)
(H12)
(H9)
Chassis
Fig. A-4
Reel S Reel T
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DECK MECHANISM DISASSEMBLY
Opener Lid
(Fig. A-5-2)
(B)
(B)
Arm
Assembly
Pinch
(Fig. A-5-3)
(C)
Base Assembly P4
Lever T/up
(Fig. A-5-1) (H13)
(Fig. A-5-4)
(C)
Chassis
Fig. A-5
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DECK MECHANISM DISASSEMBLY
Belt Capstan
(Fig. A-6-1)
Motor Capstan
(Fig. A-6-2)
Washer(W1)
Lever F/R
(Fig. A-6-3)
(L2)
Chassis
(S5)
Fig. A-6
20. Belt Capstan (Fig. A-6-1)/ 22. Clutch Assembly D35 (Fig. A-6-4)
Motor Capstan (Fig. A-6-2) 1) Remove the Washer(W1) and lift the Clutch Assembly
1) Remove the Belt Capstan. D35 up.
2) Remove the three Screws(S5) on bottom Chassis and lift
the Motor Capstan up. 23. Brake Assembly Capstan
(Fig. A-6-5)
21. Lever F/R (Fig. A-6-3) 1) Pull the Locking Tab(L2) back in direction of arrow and lift
1) Unlock the Locking Tab(L1) as Fig. A-6-3 and lift the it up.
Lever F/R up.
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DECK MECHANISM DISASSEMBLY
(H14)
(A)
Lever Tension
(Fig. A-7-5)
Lever spring
(L3)
(Fig. A-7-6)
Gear Drive Hole(C)
Base Loading
(H15)
(H16)
Chassis
Fig. A-7
24. Gear Drive (Fig. A-7-1)/ 26. Plate Slider (Fig. A-7-4)
Gear Cam (Fig. A-7-2) 1) Just lift the Plate Slider up.
1) Remove the Washer(W2) and lift the Gear Drive up.
2) Unhook the Hook(H14) of the Gear Cam and lift the Gear 27. Lever Tension (Fig. A-7-5)
Cam up. 1) Unhook the (A) portion of the Lever Tension from the
Hook(H16) of the Chassis.
NOTE 2) Turn the Lever Tension to counterclockwise direction and
lift it up.
When reassembling, align the Gear Drive Hole(A) and the
Gear Cam Hole(B) in a straight line after the Gear Drive
Hole(C) is aligned with the Chassis Hole as Fig. 28. Lever Spring (Fig. A-7-6)
1) Unlock the Locking Tab(L3) of the bottom Chassis and lift
25. Gear Sector (Fig. A-7-3) the Lever Spring up.
- 4-9 -
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DECK MECHANISM DISASSEMBLY
Gear Assembly P3
(Fig. A-8-2)
(B) (A)
Chassis
Base Assembly P3
(Fig. A-8-4) Base Assembly P2
(Fig. A-8-3)
Fig. A-8
29. Gear Assembly P2 (Fig. A-8-1)/ 30. Base Assembly P2 (Fig. A-8-3)/
Gear Assembly P3 (Fig. A-8-2) Base Assembly P3 (Fig. A-8-4)
1) Just lift the Gear Assembly P2 up. 1) Move the Base Assembly P2 in direction of arrow(A)
2) Just lift the Gear Assembly P3 up. along the guide hole of the Chassis and disassemble it
on bottom side.
NOTE 2) Move the Base Assembly P3 in direction of arrow(B)
along the guide hole of the Chassis and disassemble it
When reassembling, align the two holes of the Gear on bottom side.
Assembly P2 and P3 in a straight line after confirmation
whether the Gear Sector Hole(A) and the Plate Slider
Hole(B) are aligned or not as Fig.
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DECK MECHANISM DISASSEMBLY
(B) (C)
(D) Chassis
Fig. A-9
31. Base Loading (Fig. A-9-1) 33. Arm Assembly Idler (Fig. A-9-3)
1) Remove the Screw(S7). 1) Make narrower the two parts, (B) and (C), as Fig. A-9-3.
2) Lift the Base Loading up. 2) Lift the Arm assembly Idler up.
- 4-11 -
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- 4-12 -
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DECK MECHANISM ADJUSTMENT
1) Turn the Power S/W on and eject the Cassette by press- 4) Remove the Screw which fixes the Deck Mechanism and
ing the Eject Button. Main Frame and confirm if the Gear Cam is aligned with
2) Remove the Top Cover and Plate Assembly Top, visual- the Gear Drive as below Fig. C-1(A).
ly check if the Gear Cam Hole is aligned with the 5) Confirm if the Mode S/W on the Main P.C.Board is
Chassis Hole as below Fig. C-2. aligned as below Fig. C-1(B).
3) IF not, rotate the Shaft of the Loading Motor to either 6) Remount the Deck Mechanism on the Main P.C.Board
clockwise or counterclockwise until the alignment is as and check each operation.
below Fig. C-2.
CHECK DIAGRAM
Mode S/W
Gear Cam
(B)
(A)
Gear Drive
Gear Cam
(A’) (B)
(A)
(B’)
Chassis Hole Gear Cam Hole Gear Drive Hole
TOP VIEW
Fig. C-2
- 4-13 -
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DECK MECHANISM ADJUSTMENT
2. Preparation for Adjustment (To set the cassette without tape.
Cover the holes of the End Sensors at the both sides of
Deck Mechanism of the loading state the Chassis to prevent a light leak.
without inserting a cassette tape). Then the Deck Mechanism drives to the Stop Mode.
1) Unplug the power cord from the AC outlet. In this case, the Deck Mechanism can accept inputs of
2) Disassemble the Top Cover and Plate Assembly Top. each mode, however the Rewind and Review operation
3) Plug the power cord into the AC outlet. can not be performed for more than a few seconds
4) Turn the power S/W on and push the Lever Stopper of because the Take-up Reel Table is in the Stop State
the Holder Assembly CST to the back for loading the and can not be detected the Reel Pulses.
3. Checking Torque
Purpose: To insure smooth transport of the tape during each mode of operation.
If the tape transport is abnormal, then check the torque as indicated by the chart below.
Test Conditions
Test Equipment/ Fixture (Mechanism Condition) Checking Method
¥ Torque Gauge(600g/cm ATG) ¥ Play (FF) or Review (REW) Mode ¥ Perform each Deck Mechanism mode without
¥ Torque Gauge Adaptor inserting a cassette tape(Refer to above No.2
¥ Cassette Torque Meter Preparation for Adjustment).
SRK-VHT-303 ¥ Read the measurement of the Take-up or Supply
Reels on the Cassette Torque Meter(Fig. C-3-2).
¥Attach the Torque Gauge Adaptor to the Torque
Gauge and then read the value of it(Fig. C-3-1).
NOTE: NOTE:
The values are measured by using a Torque Gauge and The torque reading to measure occurs when the tape
Torque Gauge Adaptor with the Torque Gauge affixed. abruptly changes direction from Fast Forward to Rewind
Mode, when quick braking is applied to both Reels.
Torque Gauge
-S 300
HT 250
-V 200
SR K
150
SR
VID K
CAS EO
S K- V HT0
-T
0 50 TOR ETTE SR
Torque Gauge Q
MET UE
VHT ER
50
100
-303
Adaptor 150
200
250
300
Reel Table
- 4-14 -
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DECK MECHANISM ADJUSTMENT
4.Guide Roller Height Adjustment
Purpose: To regulate the height of the tape so that the bottom of the tape runs along the
tape guide line on the Lower Drum.
Adjustment Procedure
ADJUSTMENT DIAGRAM Guide Roller Height
1) Confirm if the tape runs along the tape guide line of the Adjustment screw
Lower Drum.
2) If the tape runs the bottom of the guide line, turn the Upper Flange
Guide Roller Height Adjustment Screw to clockwise
direction.
Guide Roller
3) If it runs the top, turn to counterclockwise direction. Retaining Screw
4) Adjust the height of the Guide Roller to be guided to the
guide line of the Lower Drum from the starting and end- Fig. C-4-1
ing point of the Drum.
- 4-15 -
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DECK MECHANISM ADJUSTMENT
5. Audio/Control (A/C) Head Adjustment
Purpose: To insure that the tape passes accurately over the Audio and Control Tracks in
exact alignment of the both Record and Playback Modes.
Adjustment Procedure/Diagrams
1) Initially adjust the Base Assembly A/C Head as shown 4) Reconfirm the tape path after Playback about 4~5 sec-
Fig. C-5-1 by using the Height Adjustment Screw(B). onds.
2) Play a blank tape and observe if the tape passes accu-
rately over the A/C Head without tape curling or folding. NOTE
3) If folding or curling is occured then adjust the Tilt
Adjustment Screw(C) while the tape is running to resem- Ideal A/C head height occurs when the tape runs between
ble Fig. C-5-3. 0.2~0.25mm above the bottom edge of the A/C Head core.
Tape
10.9
0.2~0.25mm
X-Value Adjustment
Hole
Fixed Screw
Height Adjustment
Screw(B)
Fig. C-5-2
- 4-16 -
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DECK MECHANISM ADJUSTMENT
5-2. Confirm that the tape passes smoothly (2) If folding or curling is observed at the top of it then
between the Take-up Guide and Pinch slowly turn the Tilt Adjustment Screw(C) in the
Roller(using a mirror or the naked eye). counterclockwise direction.
1) After completing Step 5-1.(Preliminary Adjustment), check NOTE:
that the tape passes around the Take-up Guide and Pinch
Roller without folding or curling at the top or bottom. Check the RF envelope after adjusting the A/C Head, if the
(1) If folding or curling is observed at the bottom of the RF waveform differs from Fig. C-5-4, performs Precise
Take-up Guide then slowly turn the Tilt Adjustment Adjustment to flat the RF waveform.
Screw(C) in the clockwise direction.
Test Conditions
Test Equipment/ Fixture Connection Point (Mechanism Condition) Adjustment Point
Oscilloscope Audio output jack Play an Alignment Tape Azimuth Adjustment Screw(A)
Alignment Tape(SP) 1KHz, 7KHz Sections Height Adjustment Screw(B)
Screw Driver(+) Type 5mm
6. X-Value Adjustment
Purpose: To obtain compatibility with the other VCR(VCP) Models.
Test Conditions
Test Equipment/ Fixture Connection Point (Mechanism Condition) Adjustment Point
- 4-17 -
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DECK MECHANISM ADJUSTMENT
7. Adjustment after Replacing Drum Assembly (Video Heads)
Purpose: To correct for shift in the Roller Guide and X value after replacing the Drum.
Test Conditions
Test Equipment/ Fixture Connection Point (Mechanism Condition) Adjustment Points
Oscilloscope CH-1: PB RF Envelope Play the Blank Tape Guide Roller Precise
Alignment Tapes CH-2: NTSC: SW 30Hz Play an Alignment Tape Adjustment
Blank Tape PAL: SW 25Hz Switching Point
Post Height Adjusting Driver Head Switching Output Tracking Preset
Screw Driver(+) Type 5mm Test Point X-Value
RF Envelope Output Test Point
Play a blank tape and check for tape curling or creasing around
the Roller Guide. If there is a problem then follow the procedure RF ENVELOPE OUTPUT TEST POINT
4. "Guide Roller Height" and 5. "Audio Control(A/C) Head CH1 CH2
Adjustment". HEAD SWITCHING OUTPUT TEST
POINT
Waveform
Fig. C-7
T-160 Tape Be sure there is no tape jamming or curling at Run the CUE, REV, Play mode at the
T-120 Tape the begining, middle or end of the tape. beginning and the end of the tape.
Checking Procedure
1) Confirm that the tape runs smoothly around the roller 2) Confirm that the tape passes over the A/C Head
guides, Drum and A/C Head Assemblies while abruptly Assembly as indicated by proper audio reproduction and
changing operating modes from Play to CUE or REV. proper tape counter performance.
This is to be checked at the begining, middle and end
sections of the tape.
- 4-18 -
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MAINTENANCE/INSPECTION PROCEDURE
1. Check before starting repairs
The following faults can be remedied by cleaning and oil-
ing. Check the needed lubrication and the conditions of
cleanliness in the unit.
Check with the customer to find out how often the unit is
used, and then determine that the unit is ready for inspec-
tion and maintenance. Check the following parts.
Replace-
Phenomenon Inspection
ment
F/E Head
Color beats Dirt on Full-Erase Head o
NOTE
If locations marked with o do not operate normally after
cleaning, check for wear and replace.
See the EXPLODED VIEWS at the end of this manual as
well as the above illustrations and see the Greasing (Page
4-21, 22) for the sections to be lubricated and greased. Fig. C-9-2 Bottom View
* No. (1)~(12) Indicates the Tape Path to be traveled from Supply Reel to Take-up Reel.
(8) P4 Post
(5) Drum Assembly
(Video Head) (10) Pinch Roller
- 4-19 -
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MAINTENANCE/INSPECTION PROCEDURE
2. Required Maintenance 4. Supplies Required for Inspection and
The recording density of a VCR(VCP) is much higher than Maintence
that of an audio tape recorder. VCR(VCP) components must (1) Grease : Kanto G-311G (Blue) or equivalent
be very precise, at tolerances of 1/1000mm, to ensure com- (2) Isopropyl Alcohol or equivalent
patibility with the other VCRs. If any of these components are (3) Cleaning Patches
worn or dirty, the symptoms will be the same as if the part is (4) Grease : Kanto G-381(Yellow)
defective. To ensure a good picture, periodic inspection and
maintenance, including replacement of worn out parts and
lubrication, is necessary. 5. Maintenance Procedure
5-1) Cleaning
3. Scheduled Maintenance (1) Cleaning video head
Schedules for maintenance and inspection are not fixed First use a cleaning tape. If the dirt on the head is too
because they vary greatly according to the way in which the stubborn to remove by tape, use the cleaning patch. Coat
customer uses the VCR(VCP), and the environment in which the cleaning patch with Isopropyl Alcohol. Touch the
the VCR(VCP) is used. cleaning patch to the head tip and gently turn the
But, in general home use, a good picture will be maintained head(rotating cylinder) right and left.
if inspection and maintenance is made every 1,000 hours. (Do not move the cleaning patch vertically. Make sure
The table below shows the relation between time used and that only the buckskin on the cleaning patch comes into
inspection period. contact with the head. Otherwise, the head may be dam-
Table 1 aged.)
When
Thoroughly dry the head. Then run the test tape. If lso-
inspection is About 1 About 18 About 3 propyl Alcohol remains on the video head, the tape may
necessary be damaged when it comes into contact with the head
year months years
surface.
Average (2) Clean the tape transport system and drive system, etc, by
hours used wiping with a cleaning patch wetted with Isopropyl
per day
Alcohol.
One hour
NOTES:
Two hours 1 It is the tape transport system which comes into contact
with the running tape. The drive system consists of those
parts which moves the tape.
Three hours 2 Make sure that during cleaning you do not touch the tape
transport system with excessive force that would cause
deformation or damage to the system.
Drum
(Rotating Cylinder)
Cleaning Patch
Head Tip
Fig. C-9-4
- 4-20 -
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MAINTENANCE/INSPECTION PROCEDURE
5-2) Greasing (2) Periodic greasing
Grease specified locations every 5,000 hours.
(1) Greasing guidelines
Apply grease, with a cleaning patch. Do not use exces- 1) Loading Path Inside & Top side 6) Plate Slider Guide Sections
sive grease. It may come into contact with the tape 2) Base Assembly P2,P3 stopper 7) Plate Slider Guide Sections
transport or drive system. Wipe excessive grease and 3) Shaft 8) Gear Assembly P2, P2 Rubbing
4) Shaft Sections
clean with cleaning patch wetted in Isopropyl Alcohol. 5) Clutch Assembly D35 Shaft
NOTE:Greasing Points
2
1) Loading Path Inside & Top side 5) Arm Take-up Rubbing Sections
2) Base Assembly P2, P3 stopper 6)Reel S,T shaft(G381:Yellow)
3) Shaft 7) Arm Assembly F/L Rotating
4) L/D Motor Gear Wheel Part Sections
1
3
4 8
1 3
5
6 7
Slider Guide
5 Slider Guide
Chassis (Bottom)
7
7
Chassis (Top)
Gear Part
Guide Rail
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MAINTENANCE/INSPECTION PROCEDURE
Lever, F/R, Base, Tension GEAR AY, P2 & P3
Boss Cam
Lever, F/R Base, Tension
Clutch
(G-754. Yellow)
Arm Tension
Guide Hole
- 4-22 -
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MECHANISM TROUBLESHOOTING GUIDE
1.Deck Mechanism
A.
Auto REW doesn’t work.
YES
Is the output of END sensor of
supply side "H"?
H : more than 3.5V
L : less than 0.7V~1V
NO
YES
Is the Vcc. voltage of End NO
Check the syscon power.
sensor 5V?
YES
Replace the End sensor.
YES
B.
No F/R modes.
YES
Is the present mode NO Is the mode SW assembled
F/R Mode? correctly? (refer to page 4-13.)
YES
NO Is the normal voltage supplied to
Does the Capstan Motor rotate? the Capstan Motor Vcc1, Vcc2?
YES YES
Do the T/Up, Supply Reel Does terminal voltage(Vctl) of NO Check the servo, power
rotate? Capstan Motor supply side more
circuits.
than 4V?
YES YES
Check the syscon circuit. Replace the Capstan Motor.
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MECHANISM TROUBLESHOOTING GUIDE
E.
NO
Is the Pinch Roller attached Check Alignment positions
to the Capstan Motor Shaft? (page 4-13).
YES
NO NO
Does the T/Up Reel turn? Is the Belt ok? Replace the Belt.
YES YES
Check the Clutch and Idler
Does the Capstan Motor turn?
Assembly.
YES
NO Is the voltage supplied to the
Does the Drum Motor turn?
Capstan Motor Vcc1,Vcc2 each?
YES YES
Is the terminal voltage(vctl) of NO
Are there DPG, DFG pulses? Capstan Motor supplied more Check the Servo, Power.
than 4V?
YES YES
Are the T/Up and Supply Reel
Sensors ok? Replace the Capstan Motor.
YES
NO NO
Is the Vcc voltage of the Drum
Check the Servo, Syscon. Check the Syscon, Circuit.
Motor normal?
YES
YES
Replace the
Drum Motor.
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MECHANISM TROUBLESHOOTING GUIDE
2. Front Loading Mechanism
A.
Does the Lever Assembly NO Is the Lever Assembly Switch NO Replace or add the Lever
Switch work? Spring damaged or omitted? Assembly Switch Spring.
YES
YES Does the CST IN Switch work
NO
Replace the CST IN Switch.
normally?
YES
Is the Vcc of Main P.C.Board
5V?
Check the syscon circuit.
YES NO
Is the voltage between cassette
switch and GND on Main Check the power circuit.
P.C.Board 5V??
YES NO
Check the Mode switch location Is there a short circuit between cassette
and syscon circuit. switch and GND on main P.C.Board?
YES NO
Remove the short circuit part or
Replace the main P.C.Board. Replace the CST IN Switch.
B.
NO
Does the L/D Motor rotate in reverse? Check the L/D Motor or Drive IC.
YES
NO
Does the Lever Assembly Switch work? Replace the Lever Assembly Switch.
YES
NO
Does the Arm Assembly F/L work normally? Replace the Arm Assembly F/L.
YES
NO
Does the Opener Door work? Replace the Opener Door.
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MECHANISM TROUBLESHOOTING GUIDE
C.
YES
YES NO
Does the Gear Assembly Rack F/L Replace the Opener Lid.
work?
NO
YES
Does the Opener Door work? Replace the Gear Rack F/L.
YES NO
Does the Arm Assembly F/L work? Check the opener Door assembled
correctly.
YES NO
Does the L/D Motor work? Replace the Arm Assembly F/L.
YES NO
YES NO
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EXPLODED VIEWS
1. Front Loading Mechanism Section
103
117
A24
110
100A
115
116
105
117
112
106
107
102
A21
100B
113
100
114
054A
032
054
A23
A22
109
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OPTIONAL PART
401
402 008
025
002 405
402 A01 010
001 A04
002A 006 A03
026
007
015
004
027
014
030
013
003
405 409 009
- 4-29 -
029
023 016
022
011
2. Moving Mechanism Section(1)
012
031 017
EXPLODED VIEWS
019
OPTIONAL PART
518
055
058
051
060
056
052A
052
517
410
061
078
A11
066
067
077
076
065
064
A12
032
068
069
070
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SECTION 6 MECHANISM OF DVD PART
CONTENTS
DECK MECHANISM PARTS 5. Frame Assembly Up/Down ..............6-4
LOCATIONS 6. Belt Loading......................................6-4
7. Gear Pulley .......................................6-4
• Top View..................................................6-1 8. Gear Loading ....................................6-4
• Top View(without Tray Disc) .................6-1 9. Guide Up/Down.................................6-4
• Bottom View ...........................................6-1 10. PWB Assembly Loading ................6-4
11. Base Main........................................6-4
DECK MECHANISM
DISASSEMBLY EXPLODED VIEW
1. Holder Clamp....................................6-2 1. Deck Mechanism Exploded View....6-5
4. Rubber Rear......................................6-3
• Bottom View
Note
6-1
6-2
6-3
6-4
429
004
430
012 025
026
A03
432
431 024A 024
431
030 029
024B
431 031
430 024A 430
012
012
028
433 021
433 435
430
022
012
018 010
013
014
017 020
011A
A02
015A
015B
430
015
015C
431
011
6-5 6-6