LG DK763X User manual

DVD VIDEO PLAYER
SERVICE MANUAL
MODEL: DK673X(DV133KEM)
MODEL: DK673X(DV133KEM)SERVICE MANUAL
P/NO : 3829RHP051K JANUARY,2006
CAUTION
BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”
IN THIS MANUAL.

CONTENTS
SECTION 1 . . . . SUMMARY
SECTION 2 . . . . CABINET & MAIN CHASSIS
SECTION 3 . . . . ELECTRICAL
SECTION 4 . . . . REPLACEMENT PARTS LIST

SECTION 1
SUMMARY
CONTENTS
PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS ........................... 1-3
SERVICING PRECAUTIONS .................................................................................................. 1-4
• General Servicing Precautions
• Insulation Checking Prodedure
• Electrostatically Sensitive Devices
SERVICE INFORMATION FOR EEPROM........................................................................... 1-5
SPECIFICATIONS ...................................................................................................................... 1-6
1-2

1-3
CAUTION : DO NOT ATTEMPT TO MODIFY THIS PRODUCT IN ANY WAY,
NEVER PERFORM CUSTOMIZED INSTALLATIONS WITHOUT MANUFAC-
TURER’S APPROVAL. UNAUTHORIZED MODIFICATIONS WILL NOT ONLY
VOID THE WARRANTY, BUT MAY LEAD TOYOUR BEING LIABLE FORANY
RESULTING PROPERTY DAMAGE OR USER INJURY.
SERVICE WORK SHOULD BE PERFORMED ONLY AFTER YOU ARE
THOROUGHLY FAMILIAR WITH ALL OF THE FOLLOWING SAFETY
CHECKS AND SERVICING GUIDELINES. TO DO OTHERWISE,
INCREASES THE RISK OF POTENTIAL HAZARDS AND INJURY TO THE
USER.
WHILE SERVICING, USE AN ISOLATION TRANSFORMER FOR PROTEC-
TION FROM A.C. LINE SHOCK.
SAFETY CHECKS
AFTER THE ORIGINAL SERVICE PROBLEM HAS BEEN CORRCTED. A
CHECK SHOULD BE MADE OF THE FOLLOWING.
SUBJECT : FIRE & SHOCK HAZARD
1. BE SURE THAT ALL COMPONENTS ARE POSITIONED IN SUCH A WAY
AS TO AVOID POSSIBILITY OF ADJACENT COMPONENT SHORTS.
THIS IS ESPECIALLY IMPORTANT ON THOSE MODULES WHICH ARE
TRANSPORTED TO AND FROM THE REPAIR SHOP.
2. NEVER RELEASE A REPAIR UNLESS ALL PROTECTIVE DEVICES
SUCH AS INSULATORS, BARRIERS, COVERS, SHIELDS, STRAIN
RELIEFS, POWER SUPPLY CORDS, AND OTHER HARDWARE HAVE
BEEN REINSTALLED PER ORIGINAL DESIGN. BE SURE THAT THE
SAFETY PURPOSE OF THE POLARIZED LINE PLUG HAS NOT BEEN
DEFEATED.
3. SOLDERING MUST BE INSPECTED TO DISCOVER POSSIBLE COLD
SOLDER JOINTS, SOLDER SPLASHES OR SHARP SOLDER POINTS.
BE CERTAIN TO REMOVE ALL LOOSE FOREIGN PARTICLES.
4. CHECK FOR PHYSICAL EVIDENCE OF DAMAGE OR DETERIORATION
TO PARTS AND COMPONENTS. FOR FRAYED LEADS, DAMAGED
INSULATION (INCLUDING A.C. CORD). AND REPLACE IF NECESSARY
FOLLOW ORIGINAL LAYOUT, LEAD LENGTH AND DRESS.
5. NO LEAD OR COMPONENT SHOULD TOUCH A RECIVING TUBE OR
A RESISTOR RATED AT 1 WATT OR MORE. LEAD TENSION AROUND
PROTRUNING METAL SURFACES MUST BE AVOIDED.
6. ALL CRITICAL COMPONENTS SUCH AS FUSES, FLAMEPROOF
RESISTORS, CAPACITORS, ETC. MUST BE REPLACED WITH EXACT
FACTORY TYPES, DO NOT USE REPLACEMENT COMPONENTS
OTHER THAN THOSE SPECIFIED OR MAKE UNRECOMMENDED CIR-
CUIT MODIFICATIONS.
7. AFTER RE-ASSEMBLY OF THE SET ALWAYS PERFORM AN A.C.
LEAKAGE TEST ON ALL EXPOSED METALLIC PARTS OF THE CABI-
NET, (THE CHANNEL SELECTOR KNOB, ANTENNA TERMINALS. HAN-
DLE AND SCREWS) TO BE SURE THE SET IS SAFE TO OPERATE
WITHOUT DANGER OF ELECTRICAL SHOCK. DO NOT USE A LINE
ISOLATION TRANSFORMER DURING THIS TEST USE AN A.C. VOLT-
METER, HAVING 5000 OHMS PER VOLT OR MORE SENSITIVITY, IN
THE FOLLOWING MANNER; CONNECT A 1500 OHM 10 WATT RESIS-
TOR, PARALLELED BY A .15 MFD. 150.V A.C TYPE CAPACITOR
BETWEEN A KNOWN GOOD EARTH GROUND (WATER PIPE, CON-
DUIT, ETC.) AND THE EXPOSED METALLIC PARTS, ONE AT A TIME.
MEASURE THE A.C. VOLTAGE ACROSS THE COMBINATION OF 1500
OHM RESISTOR AND .15 MFD CAPACITOR. REVERSE THE A.C. PLUG
AND REPEAT A.C. VOLTAGE MEASUREMENTS FOR EACH EXPOSED
METALLIC PART. VOLTAGE MEASURED MUST NOT EXCEED 75
VOLTS R.M.S. THIS CORRESPONDS TO 0.5 MILLIAMP A.C ANY
VALUE EXCEEDING THIS LIMIT CONSTITUTES A POTENTIAL SHOCK
HAZARD AND MUST BE CORRECTED IMMEDIATELY.
SUBJECT: GRAPHIC SYMBOLS
THE LIGHTNING FLASH WITH APROWHEAD SYMBOL. WITHIN
AN EQUILATERAL TRIANGLE, IS INTENDED TO ALERT THE
SERVICE PERSONNEL TO THE PRESENCE OF UNINSULATED
“DANGEROUS VOLTAGE”THAT MAY BE OF SUFFICIENT MAG-
NITUDE TO CONSTITUTE A RISK OF ELECTRIC SHOCK.
THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIAN-
GLE IS INTENDED TO ALERT THE SERVICE PERSONNEL TO
THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN
SERVICE LITERATURE.
SUBJECT : X-RADIATION
1. BE SURE PROCEDURES AND INSTRUCTIONS TO ALL SERVICE PER-
SONNEL COVER THE SUBJECT OF X-RADIATION. THE ONLY POTEN-
TIAL SOURCE OF X-RAYS IN CURRENT T.V. RECEIVERS IS THE PIC-
TURE TUBE. HOWEVER, THIS TUBE DOES NOT EMIT X-RAYS WHEN
THE HIGH VOLTAGE IS AT THE FACTORY SPECIFIED LEVEL. THE
PROPER VALUE IS GIVEN IN THE APPLICABLE SCHEMATIC. OPERA-
TION AT HIGHER VOLTAGES MAY CAUSE A FAILURE OF THE PIC-
TURE TUBE OR HIGH VOLTAGE SUPPLY AND, UNDER CERTAIN CIR-
CUMSTANCES, MAY PRODUCE RADIATION IN EXCESS OF DESIR-
ABLE LEVELS.
2. ONLY FACTORY SPECIFIED C.R.T. ANODE CONNECTORS MUST BE
USED. DEGAUSSING SHIELDS ALSO SERVE AS X-RAY SHIELD IN
COLOR SETS, ALWAYS RE-INSTALL THEM.
3. IT IS ESSNTIAL THAT SERVICE PERSONNEL HAVE AVAILABLE AN
ACCURATE AND RELIABLE HIGH VOLTAGE METER. THE CALIBRA
TION OF THE METER SHOULD BE CHECKED PERIODICALLY
AGAINST A REFERENCE STANDARD, SUCH AS THE ONE AVAILABLE
AT YOUR DISTRIBUTOR.
4. WHEN THE HIGH VOLTAGE CIRCUITRY IS OPERATING PROPERLY
THERE IS NO POSSIBILITY OF AN X-RADIATION PROBLEM. EVERY
TIME A COLOR CHASSIS IS SERVICED. THE BRIGHTNESS SHOULD
BE RUN UP AND DOWN WHILE MONITORING THE HIGH VOLTAGE
WITH A METER TO BE CERTAIN THAT THE HIGH VOLTAGE DOES
NOT EXCEED THE SPECIFIED VALUE AND THAT IT IS REGULATING
CORRECTLY, WE SUGGEST THAT YOU AND YOUR SERVICE ORGA-
NIZATION REVIEW TEST PROCEDURES SO THAT VOLTAGE REGU-
LATION IS ALWAYS CHECKED AS A STANDARD SERVICING PROCE-
DURE. AND THAT THE HIGH VOLTAGE READING BE RECORDER ON
EACH CUSTOMER’S INVOICE.
5. WHEN TROUBLESHOOTING AND MAKING TEST MEASUREMENTS IN
A PRODUCT WITH A PROBLEM OF EXCESSIVE HIGH VOLTAGE,
AVOID BEING UNNECESSARILY CLOSE TO THE PICTURE TUBE AND
THE HIGH VOLTAGE SUPPLY. DO NOT OPERATE THE PRODUCT
LONGER THAN IS NECESSARY TO LOCATE THE CAUSE OF EXCES
SIVE VOLTAGE.
6. REFER TO HV. B+ AND SHUTDOWN ADJUSTMENT PROCEDURES
DESCRIBED IN THE APPROPRIATE SCHEMATIC AND DIAGRAMS
(WHERE USED).
SUBJECT: IMPLOSION
1. ALL DIRECT VIEWED PICTURE TUBES ARE EQUIPPED WITH AN INTE
GRAL IMPLOSION PROTECTION SYSTEM, BUT CARE SHOULD BE
TAKEN TO AVOID DAMAGE DURING INSTALLATION, AVOID
SCRATCHING THE TUBE. IF SCRATCHED REPLACE IT.
2. USE ONLY RECOMMENDED FACTORY REPLACEMENT TUBES.
SUBJECT : TIPS ON PROPER INSTALLATION
1. NEVER INSTALL ANY PRODUCT IN A CLOSED-IN RECESS, CUBBY-
HOLE OR CLOSELY FITTING SHELF SPACE. OVER OR CLOSE TO
HEAT DUCT, OR IN THE PATH OF HEATED AIR FLOW.
2. AVOID CONDITIONS OF HIGH HUMIDITY SUCH AS: OUTDOOR PATIO
INSTALLATIONS WHERE DEW IS A FACTOR, NEAR STEAM RADIA-
TORS WHERE STEAM LEAKAGE IS A FACTOR, ETC.
3. AVOID PALCEMENT WHERE DRAPERIES MAY OBSTRUCT REAR
VENTING. THE CUSTOMER SHOULD ALSO AVOID THE USE OF DEC-
ORATIVE SCARVES OR OTHER COVERINGS WHICH MIGHT
OBSTRUCT VENTILATION.
4. WALL AND SHELF MOUNTED INSTALLATIONS USING A COMMER-
CIAL MOUNTING KIT. MUST FOLLOW THE FACTORY APPROVED
MOUNTING INSTRUCTIONS A PRODUCT MOUNTED TO A SHELF OR
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 OFAPRODUCT ON
SLOPING SHELF OR A TILTED POSITION, UNLESS THE PRODUCT IS
PROPERLY SECURED.
6. A PRODUCT ON A ROLL-ABOUT CART SHOULD BE STABLE ON ITS
MOUNTING TO THE CART. CAUTION THE CUSTOMER ON THE HAZ-
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
WHICH HAS NOT BEEN LISTED BY UNDERWRITERS LABORATORIES,
INC. FOR USE WITH THEIR SPECIFIC MODEL OF TELEVISION
RECEIVER OR GENERICALLY APPROVED FOR USE WITH T.V.’S OF
THE SAME OR LARGER SCREEN SIZE.
8. CAUTION CUSTOMERS AGAINST THE USE OF EXTENSION CORDS,
EXPLAIN THAT A FOREST OF EXTENSIONS SPROUTING FROM A SIN-
GLE OUTLET CAN LEAD TO DISASTROUS CONSEQUENCES TO
HOME AND FAMILY.
PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS
A.C. VOLTMETER
GOOD EARTH GROUND
SUCH AS THE WATER
PIPE. CONDUIT. ETC
PLACE THIS PROBE
ON EACH EXPOSED
METAL PART

1-4
SERVICING PRECAUTIONS
CAUTION : Before servicing the DVD covered by this service
data and its supplements and addends, read and follow the
SAFETY PRECAUTIONS. NOTE : if unforeseen circum-
stances create conflict between the following servicing pre-
cautions and any of the safety precautions in this publica-
tions, always follow the safety precautions.
Remembers Safety First:
General Servicing Precautions
1. Always unplug the DVD AC power cord from the AC
power source before:
(1)Removing or reinstalling any component, circuit board,
module, or any other assembly.
(2)Disconnection or reconnecting any internal electrical
plug or other electrical connection.
(3)Connecting a test substitute in parallel with an elec-
trolytic capacitor.
Caution : A wrong part substitution or incorrect
polarity installation of electrolytic capacitors may result
in an explosion hazard.
2. Do not spray chemicals on or near this DVD or any of
its assemblies.
3. Unless specified otherwise in this service data, clean
electrical contacts by applying an appropriate contact
cleaning solution to the contacts with a pipe cleaner,
cotton-tipped swab, or comparable soft applicator.
Unless specified otherwise in this service data, lubrication
of contacts is not required.
4. Do not defeat any plug/socket B+ voltage interlocks with
whitch instruments covered by this service manual might
be equipped.
5. Do not apply AC power to this DVD and/or any of its
electrical assemblies unless all solid-state device heat
sinks are cerrectly installed.
6. Always connect test instrument ground lead to the
appropriate ground before connection the test instrument
positive lead. Always remove the test instrument ground
lead last.
Insulation Checking Procedure
Disconnect the attachment plug from the AC outlet and turn
the power on. Connect an insulation resistance meter(500V)
to the blades of the attachment plug. The insulation resis-
tance between each blade of the attachment plug and acces-
sible conductive parts (Note 1) should be more than 1M-
ohm.
Note 1 : Accessible Conductive Parts including Metal pan-
els, Input terminals, Earphone jacks, etc.
Electrostatically Sensitive (ES) Devices
Some semiconductor (solid state) devices can be damaged
easily by static electricity. Such components commonly are
called Electrostatically Sensitive (ES) Devices. Examples of
typical ES 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 compo-
nent or semiconductor-equipped assembly, drain off any
electrostatic charge on your body by touching a known
earth ground. Alternatively, obtain and wear a commer-
cially 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 ES
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 grouned-tip soldering iron to solder or unsolder
ES devices.
4. Use only an anti-static solder removal device. Some
solder removal devices not classified a “anti-static”can
generate electrical charges sufficient to damage ES
devices.
5. Do not use freon-propelled chemicals. These can
generate electrical charge sufficient to damage ES
devices.
6. Do not remove a replacement ES device from its protec
tive package until immediately before you are ready to
install it. (Most replacement ES devices are packaged with
leads electrically shorted together by conductive foam,
aluminum foil, or comparable conductive material).
7. Immediately before removing the protective material from
the leads of a replacement ES device, touch the protective
material to the chassis or circuit assembly into which the
device will be installed.
Caution : Be sure no power is applied to the chassis or
circuit, and observe all other safety precautions.
8. Minimize bodily motions when handling unpackaged
replacement ES devices. (Normally harmless motion such
as the brushing together of your clothes fabric or the lifting
of your foot from a carpeted floor can generate static elec-
tricity sufficient to damage an ES device.)

1-5
SERVICE INFORMATION FOR EEPROM
POWER ON
DVD LOGO Status (NO Disk status)
Remotecontrol
Pause key-->1-->4-->7-->2 in order.
Press number 0~9, Press charater
A~F (1~6 for a while)
Use arrow key ( ) to move
to approprite position and make
changes
Press pause key once
Change will be applied when power
OFF-->ON.
MODEL DK673X
NAME HEX
OPT 152(R)
OPT 255(U)
OPT 300(RUS)
OPT 4D3
OPT 5 03
OPT 6 55
OPT 7 F4
OPT 8 00
DETECT NEW EEPROM
(OPTION EDIT SCREEN)

1-6
SPECIFICATIONS
•GENERAL
Power requirements: AC 200-240 V , 50/60 Hz
Power consumption: 8W
Dimensions (Approx.): 8, 7, 6 TOOL : 430 x 35 x 242 mm (17 x 1.4 x 9.5 inches)
4, 3 TOOL : 360 x 35 x 242 mm (14.2 x 1.4 x 9.5 inches)
(W x H x D) without foot
Weight (Approx.): 8, 7, 6 TOOL : 1.9 kg (4.2 lbs)
4, 3 TOOL : 1.9 kg (4.2 lbs)
Operating temperature: 5 °C to 35 °C (41 °F to 95 °F)
Operating humidity: 5 % to 90 %
•OUTPUTS
VIDEO OUT: 1 V (p-p), 75 Ω, sync negative, RCA jack x 1/SCART (TO TV)
COMPONENT VIDEO OUT: (Y) 1.0 V (p-p), 75 Ω, negative sync, RCA jack x 1
(Pb)/(Pr) 0.7 V (p-p), 75 Ω, RCA jack x 2
AUDIO OUT: 2.0 Vrms (1 KHz, 0 dB), 600 Ω, RCA jack (L, R) x 1 / SCART(TO TV)
DIGITAL OUT (COAXIAL): 0.5 V (p-p), 75 Ω, RCA jack x 1
DIGITAL OUT (OPTICAL) : 3 V (p-p), 75 Ω, Optical jack x 1
(OPTIONAL)
•SYSTEM
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 22 kHz
CD: 8 Hz to 20 kHz
Signal-to-noise ratio: More than 90 dB (ANALOG OUT connectors only)
Harmonic distortion: Less than 0.02%
Dynamic range: More than 95 dB (DVD/CD)

2-1
SECTION 2
CABINET & MAIN CHASSIS
CONTENTS
EXPLODED VIEWS.....................................................................................................................2-2
1. Cabinet and Main Frame Section...........................................................................................2-2
2. Deck Mechanism Section(DP-10)...........................................................................................2-3
3. Packing Accessory Section....................................................................................................2-4

2-2
EXPLODED VIEWS
1. Cabinet and Main Frame Section
A42
A43
A49
A47
A00
A44
A46
283
280 452
452
CN902
P101
CABLE90
463
465
465
463
463
250
463
463
467
260
261
261
300
320
463
NOTES) THE EXCLAMATION POINT WITHIN AN
EQUILATERAL TRIANGLE IS INTENDED
TO ALERT THE SERVICE PERSONNEL
TO THE PRESENCE OF IMPORTANT
SAFETY INFORMATION IN SERVICE
LITERATURE.
KARAOKE
MODEL ONLY
A41 276
KARAOKE MODEL
ONLY
279
A
5
4
3
2
1
BCD

2. Deck Mechanism Section(DP-10)
2-3
001
002
003
020
439
018
013
017
015B
015A
440
019
012 015
012
432
030
010
439
431
435
021
430
024
025
036
012A
012A
026
016
435
014
A01
A02
A03
A00

2-4
3. Packing Accessory Section
BATTERY
808
PACKING SHEET
804
PACKING
OPTIONAL PARTS
803
806
820
OWNER’S MANUAL
RF CABLE
810 CABLE SETASS’Y
801
REMOCON
900
BOX CARTON
802
PACKING
803
811
812
PLUG ASS’Y 1WAY(YELLOW)
PLUG ASS’Y 1WAY(BLACK)
PLUG ASS’Y 2WAY
832 DISC

3-1
ELECTRICAL TROUBLESHOOTING GUIDE......................................................................3-2
1. Power check flow.....................................................................................................................3-2
2. System operation flow ............................................................................................................3-3
3. Test & debug flow....................................................................................................................3-4
4. KARAOKE Flow (KARAOKE MODEL ONLY).......................................................................3-10
DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING....................3-11
1. SYSTEM 27MHz CLOCK, RESET, FLASH R/W SIGNAL. ....................................................3-11
2. SDRAM CLOCK......................................................................................................................3-13
3. TRAY OPEN/CLOSE SIGNAL................................................................................................3-13
4. SLED CONTROL RELATED SIGNAL(NO DISC CONDITION).............................................3-14
5. LENS CONTROL RELATED SIGNAL(NO DISC CONDITION).............................................3-14
6. LASER POWER CONTROL RELATED SIGNAL(NO DISC CONDITION)............................3-15
7. DISC TYPE JUDGEMENT WAVEFORM................................................................................3-15
8. FOCUS ON WAVEFORM........................................................................................................3-17
9. SPINDLE CONTROL WAVEFORM(NO DISC CONDITION...................................................3-18
10. TRACKING CONTROL RELATED SIGNAL(System checking).........................................3-19
11. MT1389E AUDIO OPTICAL AND COAXIAL OUTPUT (SPDIF)..........................................3-20
12. MT1389E VIDEO OUTPUT WAVEFORM.............................................................................3-20
13. AUDIO OUTPUT FROM AUDIO MT1389E...........................................................................3-21
BLOCK DIAGRAMS..................................................................................................................3-22
1. OVERALL BLOCK DIAGRAM................................................................................................3-22
2. POWER(SMPS) BLOCK DIAGRAM.......................................................................................3-23
3. SERVO BLOCK DIAGRAM....................................................................................................3-24
4. MPEG & MEMORY BLOCK DIAGRAM .................................................................................3-25
5. VIDEO & AUDIO BLOCK DIAGRAM .....................................................................................3-26
CIRCUIT DIAGRAMS................................................................................................................3-27
1. POWER(SMPS) CIRCUIT DIAGRAM.....................................................................................3-27
2. SYSTEM CIRCUIT DIAGRAM................................................................................................3-29
3. SERVO CIRCUIT DIAGRAM ..................................................................................................3-31
4. AV/JACKCIRCUIT DIAGRAM.................................................................................................3-33
5. TIMER CIRCUIT DIAGRAM ( 3 TOOL ONLY ) ......................................................................3-35
6. TIMER CIRCUIT DIAGRAM ( 4 TOOL ONLY ) ......................................................................3-37
7. TIMER CIRCUIT DIAGRAM ( 6 TOOL ONLY ) ......................................................................3-39
8. TIMER CIRCUIT DIAGRAM ( 7 TOOL ONLY ) ......................................................................3-41
9. TIMER CIRCUIT DIAGRAM ( 8 TOOL ONLY ) ......................................................................3-43
10. KARAOKE CIRCUIT DIAGRAM (KARAOKE MODEL ONLY) ............................................3-45
•CIRCUIT VOLTAGE CHART ....................................................................................................3-47
PRINTED CIRCUIT DIAGRAMS............................................................................................3-49
1. MAIN P.C.BOARD...................................................................................................................3-49
2. KEY P.C.BOARD.....................................................................................................................3-51
3. TIMER P.C.BOARD.................................................................................................................3-51
4. SMPS P.C.BOARD (360mm ONLY) .......................................................................................3-53
5. SMPS P.C.BOARD (430mm ONLY) .......................................................................................3-53
6. KARAOKE P.C.BOARD (KARAOKE MODEL ONLY) ...........................................................3-54
SECTION 3
ELECTRICAL
CONTENTS

3-2
ELECTRICAL TROUBLESHOOTING GUIDE
1. Power check flow
No 3.3VA
Replace the FR101
(Use the same ICW)
Is the FR101
Normal?
Is the Vcc (about 8.7V)
supplied to IC101 Pin2?
Is the D105/ D106/
D107/ D108 Normal?
NO
NO
NO
NO
NO
NO
NO
Replace the D105/
D106/D107/D108
Check or Replace
the IC101
Replace the D121
Replace the IC103
Replace the D123
Replace the D125
YES
YES
YES
YES
YES
YES
Is the D121
normal?
YES
YES
Is there about 2.5V
at the IC103 Pin1?
Is the D123
normal?
Is the D125
Normal?
Power Line of Main
PCB(DVD) is short
No 12V
Check or Replace
the D125
Is the Vcc(=14V) sup-
plied to Q123 Collector?
Check or Replace
the Q123
Is the Vcc(=12V) sup-
plied to Q126 Base?
NO
NO
Check the ‘PWR CTL
“H”’ signal from µ-com
YES
YES
YES
No REG 5.0V
Check or Replace
the D123
Is the Vcc(=5.6V) sup-
plied to Q126 Collector?
Check or Replace
the Q126
Is the Vcc(=12V) sup-
plied to Q126 Base?
NO
NO
Check the ‘PWR CTL
“H”’ signal from µ-com
YES
YES
YES

3-3
NO
NO
NO
YES
YES
YES
YES
YES
Power On
1. 8032 initializes SERVO,DSP & RISC registers
2. Write RISC code to SDRAM
3. Reset RISC
Show LOGO
Tray Closed ?
Tray Close to Closed position
SLED at Inner Side ?
SLED Moves to Inner Position
1. Judge whether have disc and disc type
2. Jump to related disc reading procedure
Recieve OPEN/CLOSE Key?
1. Execute Pressed Key & IR Key
2. System operation Routine Loop
1. Stop Playback & Open Tray
2. Display tray open message & LOGO
Receive CLOSE Key?
2. System operation flow

3-4
3. Test & debug flow
TEST
Check the AC Voltage
Power PCBA(110V or 220V)
YES
Switch on the Power PCBA
YES
Is the DC Voltage outputs OK?
(5V, 3.3V, 12V,5.6V MOTOR)
YES
Make sure the main PCBA don't short on
VCCs and switch it on.
YES
Is 3.3V and 1.8V DC outputs normal on
main PCBA?
YES
Connect to PC RS232 Cable and update
the FLASH memory code.
YES
Update FLASH successfully?
YES
A
Replace power PCBA or AC transformer.
NO
Repair or Replace Power PCBA
NO
Check the regulators or related diodes.
NO
1. Check 27MHz system clock.
2. Check system reset circuit.
3. Check FLASH R/W enable signal
PRD,RWR.
4. Check RS232 SIGNALS.
5. Check FLASH Memory related circuit.
NO

3-5
A
Flash Memory operates
properly?
Show LOGO?
Does Tray move inside when
it is not at closed position?
B
NO
NO
YES YES
YES
YES
YES
YES
YES
YES
YES
Check connection lines between
FLASH & MT1389E and the FLASH
access time whether is suitable or not.
NO
SDRAM works properly?
Check connection lines
between SDRAM & MT1389E
and the SDRAM is damaged.
NO
MT1389E VIDEO outputs
properly? Check the related circuit of MT1389E.
NO
Have TV signal output?
Check AV cable connection
to TV set.
Normal TROUT &TRIN
signals?
Check the filtering and amp
circuit of TV signal.
NO
Check the load OPEN &
CLOSE switch
NO
Normal TRCLOSE &
TROPEN signal? Check the Tray control IO
pins on MT1389E &
AM5869S
NO
Normal LOAD+ &
LOAD - signal?
Check the cable connection
between main PCBA and
loader.
Check the Tray control
amplifying circuit on Motor
driver.
NO

3-6
B
Motor Driver STBY Pin is
High?
Does the SLED move to
inner side when it is at outter
position?
Do not put in disc and tray
close.
Optical Lens has movements
for searching Focus?
C
NO
NO
YES
YES
YES
YES
YES
YES
Check the connection line of
STBY signal.
NO
Is FMSO DC Level higher
than 1.4V? Check the related circuit of FMSO.
NO
SL+ and SL- output
properly?
YES
Check the amp circuit on
motor driver.
Check FOSO connection on
MT1389E and motor dirver.
NO
NO
Check the cable connection
with MECHA.
Proper FOSO outputs
to motor driver?
Proper F+ & F- outputs? Check the amp circuit on
motor dirver.
NO
Check cable connect on with
pick-up head.

3-7
C
LD01 or LD02 output
properly?
Laser turns on when
reading disc?
Put disc in?
Disc ID is correct?
Does spindle rotate?
D
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
Check the laser power circuit
on MT1389E and connecting
to power transistor.
NO
Collector voltage of
power transistor is OK? Check the related circuit on laser power transistor
NO
Check cable connection
between transistor ouput
and pick-up head.
YES
YES
YES
Check the related circuit
on MT1389E RFL signal.
Check DMSO related
circuit on MT1389E.
NO
NO
Check the spindle control
amp circuit of motor driver.
NO
Laser off
Proper RFL signal on
MT1389E?
Check LDO1 & LDO2 signal
Proper DMSO signal on
MT1389E
SP+ & SP- output properly?
Check the cable connection
between spindle and main
PCBA.

3-8
D
Proper signals on A, B, C,
D of MT1389E
Focus ON OK?
Track On OK?
Disc is play ?
E
NO
NO
NO
YES
YES
YES
YES
YES
Check connections between
MT1389E and pick-up head.
NO
Check FEO signal on
MT1389E
YES
Check the FOSO
connection on MT1389E
and motor driver.
NO
Check FOSO signal on
MT1389E
YES
YES
Check the TRSO
connection on MT1389E
and motor dirver.
NO
Check the tracking control
amp circuit on motor driver.
NO
Normal TEO Signal on
MT1389E?
NO
Check the related circuit on
MT1389E
Properly TRSO signal on
MT1389E?
T+ & T- output properly?
Check cable connection on
pick-up head.
Check RFO & RFLVL signal
waveform.

3-9
E
Audio AMP IC received
correct data stream?
Normal Audio output
when disc playback?
Normal IR.VFD & Front
pannel key functions?
TEST END
NO
NO
YES
YES
YES
YES
Check connection between
MT1389E & Audio AMP IC.
NO
Normal Audio AMP IC out?
YES
Check the related circuit of
Audio AMP IC.
NO
Check Audio filter,
mute circuit.
Communications between
IR.VFD Front pannel key &
MT1389E is normally?
NO
Check communication lines
on MT1389E.
Check the cable connection
on Front pannel.