LG V9120W User manual

DVD-VCR
SERVICE MANUAL
MODEL : V9120W(V9120QW1M)
CAUTION
BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”
IN THIS MANUAL.
MODEL : V9120W(V9120QW1M)SERVICE MANUAL

CONTENTS
SECTION 1 . . . . SUMMARY
SECTION 2 . . . . CABINET & MAIN CHASSIS
SECTION 3 . . . . ELECTRICAL
SECTION 4 . . . . MECHANISM OF VCR PART
SECTION 5 . . . . MECHANISM OF DVD PART
SECTION 6 . . . . REPLACEMENT PARTS LIST

1-2
SECTION 1
SUMMARY
CONTENTS
PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS ......... 1-3
SERVICING PRECAUTIONS .................................................................................. 1-4
SERVICE INFORMATION FOR EEPROM IC SETTING(VCR ................................1-5
SERVICE INFORMATION FOR EEPROM (DVD ....................................................1-6
SPECIFICATIONS ................................................................................................... 1-7

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 TO YOUR BEING LIABLE FOR ANY
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 CORRECTED. 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.
. 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.
. 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.
. 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.
. 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 OF A PRODUCT 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 VCR+DVD covered by this
service data and its supplements and addends, read and fol-
low the SAFETY PRECAUTIONS. NOTE : if unforeseen cir-
cumstances create conflict between the following servicing
precautions and any of the safety precautions in this publi-
cations, always follow the safety precautions.
Remembers Safety First:
General Servicing Precautions
1. Always unplug the VCR+DVD AC power cord from the AC
power source before:
(1) Removing or reinstalling any component, circuit board,
module, or any other assembly.
( ) 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.
. Do not spray chemicals on or near this VCR+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 VCR+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.
. 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 IC SETTING(VCR
MODEL NAME HEX BINARY
V91 0W OPT0 00 00000000
OPT1 00 00000000
OPT 64 00000000
OPT3 C1 00000000
OPT4 4D 00000000
OPT5 4A 00000000
WR : OK I : EXIT MOVE : F G
EDIT : DE
1. DETECT NEW EEPROM (OPTION EDIT
SCREEN)
- Eeprom EDIT screen automatically appears if
replacing Eeprom.
- Setup option data using the cursor Up/Down key
of a remote control.
(Setup upon BOM depending on OPT0~OPT5
model)
• Since an initial remote control is set to LG for LG
model, appropriately set optiona data using the
cursor Up/Down key.
. EEPROM WRITED AND EEPROM INITIAL
- Writes data on EEPROM by using REMOCON
"OK" + FRONT PLAY KEY FOR MORE THAN 5
SECONDS.
3. PG ADJUST
1) Payback the SP standard tape
) Press the “OK” key on the Remote controller
and the “PLAY” key on the Front Panel the
same time, then it goes in to Tracking initial
mode.
3) Repeat the above step(No. ), then it finishes
the PG adjusting automatically.
4) Stop the playback, then it goes out to PG
adjusting mode after mony the PG data.
4. BUYER SELECTION
- Font ejection key + open/close key for more than
5 seconds.
- Option code is displayed in TV
- First byte of OPTO is changed whenever front
eject key + open/close key.
- Philips remote conroller No.9.
EEPROM option code No. setting EEPROM option code No. setting procedure
NAME HEX BINARY
OPT0 00 00000000
OPT1 00 00000000
OPT 00 00000000
OPT3 00 00000000
OPT4 00 00000000
OPT5 00 00000000
1 / 6 - 00 V00 <--- µ-COM Ver.
ID : LG
VERSION : 05 ROM
DATE : 0 .17.05 Correction Ver.

1-6
SERVICE INFORMATION FOR EEPROM (DVD
POWER ON
DVD LOGO Status (NO Disk status)
Remotecontrol
Pause key-->1-->4-->7--> in order.
Press number 0~9, Press charater
A~F (1~6 for a while)
Use arrow key (F D G E) to move
to approprite position and make
changes
Press pause key once
Change will be applied when power
OFF-->ON.
* OPTION
• NTSC model doesn’t have VCR option and use DVD option B~F as VCR option. (only DVD exist)
• PAL model has another separate VCR option. (Both VCR and DVD exist)
MODEL V9120W
NAME HEX
OPT 1 41
OPT 55
OPT 3 00
OPT 4 C7
OPT 5 13
OPT 6 05
OPT 7 F4
OPT 8 00
OPT 9 00
OPT A 00
OPT B 80
OPT C 00
OPT D 00
OPT E 00
OPT F 00
OPT G 00
DETECT NEW EEPROM
(OPTION EDIT SCREEN)

1-7
SPECIFICATIONS
General
Power requirements AC 0- 30V, 50Hz
Power consumption 17W
Dimensions (approx.) 430 X 78.5 X 65 mm (w/h/d)
Mass (approx.) 4.0 kg
Operating temperature 5°C to 35°C (41°F to 95°F)
Operating humidity 5 % to 90 %
Timer 4 hours display type
RF Modulator UHF -68 (Adjustable)
System
Laser Semiconductor laser, wavelength 650 nm
Video Head system Double azimuth 6 heads, helical scanning.
Signal system PAL
Frequency response DVD (PCM 96 kHz): 8 Hz to 44 kHz
DVD (PCM 48 kHz): 8 Hz to kHz
CD: 8 Hz to 0 kHz
Signal-to-noise ratio More than 100dB (ANALOG OUT connectors only)
Harmonic distortion Less than 0.008%
Dynamic range More than 100 dB (DVD)
More than 95 dB (CD)
INPUTS (VCR
Audio -6.0dBm, more than 47 kohms (RCA)
Video 1.0 Vp-p, 75 ohms, unbalanced
OUTPUTS (DVD
VIDEO OUT 1 Vp-p 75 ohms, sync. negative
S-VIDEO OUT (Y) 1 Vp-p 75 ohms, negative sync., Mini Din 4-pin x 1
(C) 0.3 Vp-p 75 ohms
COMPONENT VIDEO OUT (Y) 1 Vp-p 75 ohms, negative sync., RCA jack x 1
(Progressive Scan) (Pb)/(Pr) 0.7 Vp-p 75 ohms, RCA jack x
RGB output 0.7 Vp-p 75 ohms
Audio output (digital audio) 0.5 V (p-p), 75 ohms, RCA jack x 1
Audio output (optical audio) 3 V (p-p), 75 ohms, Optical connector x 1
Audio output (analog audio) .0 Vrms (1 kHz, 0 dB), 600 ohms,
RCA jack (L, R) x /SCART (TO TV)
OUTPUTS (VCR
Audio -6.0dBm, less than 1 kohms
Video 1.0Vp-p, 75 ohms, unbalanced
RGB output 0.7 Vp-p 75 ohms
*Design and specifications are subject to change without notice.

2-1
SECTION 2
CABINET & MAIN CHASSIS
CONTENTS
EXPLODED VIEWS .....................................................................................................................2-2
1. Cabinet and Main Frame Section ...........................................................................................2-2
2. Packing Accessory Section ....................................................................................................2-3

2-2
EXPLODED VIEWS
1. Cabinet and Main Frame Section
A00
A26
A50
A44
260
A47
A46
274
463
261
261
452
261
261
330
265
465
469
300
323
250
463
463
463
469
324
288
471
463
470
457
A43
285
286
283
284
280
A
5
4
3
2
1
BCD

2-3
2. Packing Accessory Section
BATTERY
808
BAG
804
PACKING
OPTIONAL PARTS
803
806
INSTRUCTION ASSEMBLY
CABLE, COAXIAL
810 CABLE ASS’Y, RF
801
REMOCON
900
BOX CARTON
802
PACKING
803
811
812
PLUG ASS’Y 1WAY(YELLOW)
PLUG ASS’Y 2WAY(RED/WHITE)
813 PLUG ASS’Y 1WAY(BLACK)

3-1
SECTION 3
ELECTRICAL
CONTENTS
OVERALL BLOCK DIAGRAM.............................3-2
VCR PART
ELECTRICAL ADJUSTMENT
PROCEDURES..........................................................3-3
ELECTRICAL TROUBLESHOOTING
GUIDE...........................................................................3-4
1. Power(SMPS Circuit .............................................3-4
2. SYSTEM/KEY CIRCUIT ..........................................3-7
3. SERVO CIRCUIT.....................................................3-8
4. Y/C CIRCUIT..........................................................3-11
5. Hi-Fi CIRCUIT .......................................................3-15
6. Tuner/IF CIRCUIT .................................................3-18
BLOCK DIAGRAMS..............................................3-20
1. Power(SMPS BLOCK DIAGRAM .......................3-20
2. Tu/IF, NICAM & A2 BLOCK DIAGRAM................3-22
3. VPS BLOCK DIAGRAM........................................3-23
4. Y/C BLOCK DIAGRAM .........................................3-24
5. Hi-Fi BLOCK DIAGRAM .......................................3-26
6. SYSTEM BLOCK DIAGRAM ................................3-28
CIRCUIT DIAGRAMS............................................3-30
1. Power(SMPS CIRCUIT DIAGRAM 1...................3-30
2. TU/IF CIRCUIT DIAGRAM ....................................3-35
4. A/V CIRCUIT DIAGRAM .......................................3-37
4. Hi-Fi CIRCUIT DIAGRAM .....................................3-39
6. SCART(JACK CIRCUIT DIAGRAM ....................3-38
7. SYSTEM CIRCUIT DIAGRAM ..............................3-40
• WAVEFORM & VOLTAGE SHEET .........................3-42
• CIRCUIT VOLTAGE CHART...................................3-43
PRINTED CIRCUIT DIAGRAMS .......................3-48
1. MAIN P.C.BOARD (VCR+DVD _
SOLDER SIDE.......................................................3-48
2. MAIN P.C.BOARD (VCR+DVD _
COMPONENT SIDE ..............................................3-50
3. POWER P.C.BOARD.............................................3-52
4. KEY P.C.BOARD...................................................3-54
5. TIMER P.C.BOARD ...............................................3-54
DVD PART
ELECTRICAL TROUBLESHOOTING
GUIDE.........................................................................3-56
1. SYSTEM OPERATION FLOW ..............................3-56
2. SYSTEM TEST FLOW ..........................................3-57
DETAILS AND WAVEFORMS ON SYSTEM
TEST AND DEBUGGING ....................................3-63
1. SYSTEM 27MHZ CLOCK, RESET,
FLASH R/W SIGNAL ............................................3-63
2. SDRAM CLOCK ....................................................3-65
3. TRAY OPEN/CLOSE SIGNAL ..............................3-65
4. SLED CONTROL RELATED SIGNAL
(NO DISC CONDITION ........................................3-66
5. LENS CONTROL RELATED SIGNAL
(NO DISC CONDITION ........................................3-66
6. LASER POWER CONTROL RELATED
SIGNAL(NO DISC CONDITION ...........................3-67
7. DISC TYPE JUDGEMENT WAVEFORM ..............3-67
8. FOCUS ON WAVEFORM ......................................3-69
9. SPINDLE CONTROL WAVEFORM
(NO DISC CONDITION ........................................3-70
10. TRACKING CONTROL RELATED
SIGNAL(SYSTEM CHECKING ..........................3-71
11. MT1389 AUDIO OPTICAL AND COAXIAL
OUTPUT(SPDIF .................................................3-72
12. MT1389 VIDEO OUTPUT WAVEFORM..............3-72
13. MT1389 AUDIO OUTPUT TO AUDIO DAC ........3-73
14. AUDIO OUTPUT FROM AUDIO DAC.................3-74
BLOCK DIAGRAMS..............................................3-75
1. OVERALL BLOCK DIAGRAM..............................3-75
2. SERVO BLOCK DIAGRAM ..................................3-76
3. MPEG & MEMORY BLOCK DIAGRAM ...............3-77
4. VIDEO & AUDIO BLOCK DIAGRAM ...................3-78
CIRCUIT DIAGRAMS............................................3-79
1. SYSTEM CIRCUIT DIAGRAM ..............................3-79
2. RF & DSP SERVO CIRCUIT DIAGRAM...............3-81
3. AV/JACK CIRCUIT DIAGRAM..............................3-83
• CIRCUIT VOLTAGE CHART...................................3-85

3-2
OVERALL WIRING DIAGRAM
PMC01
CFG
12VA(CAP)
5.2VA
CAP REV'H'
I-limit
MOTOR GND
GND
12VA(DRUM)
CAP CTL
LD IN
DFG/FG
DRUM CTL
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
P3D01
SP PB A
SP REC
SP PB B
EP PB B
EP REC
EP PBA
Hi-Fi PB A
Hi-Fi REC
Hi-Fi PB B
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
PPM01
MOTOR_Vcc
REG_12V
REG_9V
GND
8V
GND
3.3V
PWR_CTL'H'
33V
GND
5.3VA
5V
M5V/5VT
1
2
3
4
5
6
7
8
9
10
11
12
13
1
2
3
4
5
6
7
8
9
10
11
12
13
PMD01 PMD02
Vcc(HF)
RF
DVD_LD
DVD_PD
VOL(DVD)
GND
VC_INPUT
Vcc(HF)
F
E
A
D
C
B
F(+)
T(-)
T(+)
F(-)
Vcc
GND
CD_LD
CD_PD
VOL(CD)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
PMD03
SPM +
SPM -
FM +
FM -
LM -
LM +
SW(OPEN)
SW(CLOSE)
GND
SW(LEAD IN)
GND
1
2
3
4
5
6
7
8
9
10
11
1
2
3
4
5
6
7
8
9
10
11
K-RTN2
GND
1 21
2
P3D02
CTL(+)
CTL(-)
A/E(+)
A/E(-)
A.REC
A.PB
1
2
3
4
5
6
1
2
3
4
5
6
GND
FULL ERASE
P3D03
1
21 2
DECK MD
KEY
BOARD
SMPS
BOARD
ONE
BOARD

3-3
ELECTRICAL ADJUSTMENT PROCEDURES
1. Servo Adjustment
1) PG Adjustment
• Test Equipment
• Adjustment And Specification
a) OSCILLOSCOPE
b) NTSC MODEL : NTSC SP TEST TAPE
C) PAL MODEL : PAL SP TEST TAPE
MODE
PLAY
• 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(TP) and CH to the Video Out for the VCR.
c) Trigger the mixed Combo Video Signal of CH to the CH1 H/SW(TP), and then check the distance (time
difference), which is from the selected A(B) Head point of the H/SW(TP) signal to the starting point of
the vertical synchronized signal, to 6.5H ± 0.5H (41 µs, 1H=63µs).
• PG Adjustment Method
a-1) Payback the SP standard tape
b- ) Press the “OK” key on the Remote controller and the “PLAY” key on the Front Panel the same time
for more than 5seconds, then it goes in to Tracking initial mode.
c-3) Repeat the above step(No.b- ), 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
• WAVEFORM
V.Out
H/SW(TP) R/C TRK JIG KEY 6.5 ± 0.5H
MEASUREMENT POINT ADJUSTMENT POINT SPECIFICATION
V.Out
H/SW(TP)
OSCILLOSCOPE
CH1 CH2
V.out
R/C KEY
H/SW
(TP)
H/SW
Composite
VIDEO
6.5H(416us)
VCR PART

3-4
ELECTRICAL TROUBLESHOOTING GUIDE
NO Check or Replace
the D10
Replace the D1 3
Replace the D1 4
Replace the D1 1
YES
YES
Is the D1 1
Normal?
Power Line of Main
PCB is short
1. Power(SMPS CIRCUIT
No 5.3VA
Replace the FR101
(Use the same ICW)
Is the FR101
Normal?
Is the R101
Normal?
Is the BD101
Normal?
NO
NO
NO
NO
NO
NO
NO
NO
NO
Replace the
BD101
Replace the R101
Is the D10
normal?
Replace the D1 5
Replace the IC103
YES
YES
YES
YES
YES
YES
YES
Is Vcc (9V - 18V) sup-
plied to IC101 Pin ?
Are the D1 5
normal?
Is there about .5V
at the IC103 Pin1?
Is the D1 3
normal?
Is the D1 4
Normal?
(1) No 5.3VA

3-5
No 33V
Is the Vcc(33V) sup-
plied to Q161 Emittor?
Check or Replace
the D1 1
Is the Q16 Base
‘H’?
Check the PWR CTL
“H” signal from µ-com
Check or Replace
the Q161
YES
YES
YES
(5) No 33V
No 5.0V_D
Check or Replace
the D1 5
Is the Vcc(5.3V) sup-
plied to Q165 Emittor?
Check or Replace
the Q165
Is the Q16 Base
‘H’?
NO
NO
Check the PWR CTL
“H” signal from µ-com
YES
YES
YES
( ) No 5.0V_D
No 5.0V_T
Check or Replace
the D1 5
Check the PWR CTL
“H” signal from µ-com
Is the Vcc(5.3V) sup-
plied to Q163 Emittor?
Is the Q16 Base
‘H’?
Check or Replace
the Q163
NO
NO
YES
YES
YES
(3) No 5.0V_T
No 3.3V
Check or Replace
the D1 3
Is there about 3.8V
at the IC131 pin1?
Is there about 3.3V~5V
at the IC131 pin4?
NO NO
Check the PWR CTL
“H” signal from µ-com
NO NO
YES
YES
Check the IC131
and Replace
YES
(4) No 3.3V

3-6
No Motor_Vcc
Check or Replace
the D1 4
Is the Vcc(14V)
supplied to C134?
Check or Replace
the Cap / Drum
NO
YES
YES
(6) No Motor_Vcc (To Cap, Drum Motor )
No 8V
Check or Replace
the D1 6.
Is there about 13V
at the IC141 Pin 1?
Is there about 3.3V~5V
at the IC141 Pin 4?
NO
Check the PWR CTL
“H” signal from µ-com.
NO
YES
YES
Check the IC141
and Replace
YES
(8) No 8V (To DVD )
No REG 1 V
Is the Vcc(14V) supplied
to Q165 Collector?
YES
Is the Vcc(14V) sup-
plied to Q165 Base?
YES
Check or Replace
the Q165
YES
(7) No REG 1 V
Check or Replace
the D1 4
NO
NO
Check the PWR CTL
“H” signal from µ-com

3-7
2. SYSTEM/KEY CIRCUIT
(1) AUTO STOP
( ) The unstable loading of a Cassette tape
Auto Stop
Does the SW 5 waveform
appear at the IC501
Pin 3?
Do the T-UP Reel Pulses
appear at the IC501 Pin3?
Is 1 V applied to the
PMC01 Pin8?
Check the Drum Motor
signal.
Does 5.0V appear at the
RS501?
Check the Power Circuit.
Check the Power.
Is 5.0V applied to the
R544 ?
Refer to SMPS 5.3VA
troubleshooting.
Check the IC501
Pins 86, 87, 88, 89.
Do T/UP Reel Pulses
appear at the Q514 Base
terminal?
Replace the T/UP Reel
Sensor (RS501).
Check the CST SW and
the peripheral circuitry.
Replace the IC501.
The unstable loading of a
Cassette tape
Does the “H” signal appear
at the IC501 Pin3 during
inserting the CST ?
Does the “L” signal appear
at the IC501 Pin19 during
inserting the CST?
Check the Deck
Mechanism.
Caution : Auto stop can occur because Grease or Oil is dried up
YES
YES
YES NO
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO NO
YES
YES YES

3-8
3. SERVO CIRCUIT
(1) Unstable Video in PB MODE
Unstable Video in
PB Mode.
Does the Noise level of the
screen change
periodically?
Replace the IC501.
Refer to “When the Y signal
doesn’t appear on the
screen in PB Mode”.
Does the CFG waveform
appear at the IC501
Pin67?
On tracking do the CTL
pulses move?
Does the Video Envelope
waveform appear at the
IC501 Pin8 ?
Replace the IC501.
YES
YES
YES
YES
YES
NO
NO
( ) When the Drum Motor
( ) doesn’t run. Do the DFG Pulses appear
at the PMC01 Pin11?
Replace the Cap M.
Aren’t the foil patterns and
the Components between
IC501 Pin 104 and PMC01
Pin11 short?
Replace the IC501.
Refer to “( )
No 1 VA of Power section”
Do the Drum PWM Pulses
appear at the IC501
Pin34?
Aren’t the foil patterns and
the Components between
IC501 Pin34 and PMC01
Pin1 short?
Do the DFG Pulses appear
at the IC501 Pin104?
Do the Drum PWM Pulses
appear at the IC501
Pin34?
Aren’t the connecting patterns and the Components
between IC501 Pin34 and PMC01 Pin1 short?
When the Drum Motor
doesn’t run,
Does 1 V appear at the
PMC01 Pin8?
Does .8V appear at the
PMC01 Pin1 ?
Check the connector
(PMC01) and the Drum
Motor Ass’y.
NO
YES
YES
YES
NO
NO
NO
NO
NO
YES
YES
YES

3-9
Does the CFG signal appear at the
PMC01 Pin1?
Does the PWM signal appear at the
IC501 Pin33?
Does .8V appear at the PMC01?
Check the PMC01 and the Capstan
Motor Ass’y.
Does the Capstan PWM signal appear at
the IC501 Pin33?
Aren’t the foil patterns and Components
between IC501 Pin33 and PMC01
Pin9 short?
Does the CFG signal come into the
IC501 Pin67?
Aren’t the foil patterns and Components
between IC501 Pin33 and PMC01
Pin9 short?
2. SERVO CIRCUIT
(3) When the Capstan Motor doesn’t run,
NO
NO
NO
YES
YES
YES
When the Capstan Motor doesn’t run,
Does 1 VA appear at the PMC01?
YES
Replace the IC501.
YES
NO
NO
YES
Refer to “SMPS(CAPSTAN/1 Volt)
Trouble Shooting”.
Aren’t the foil patterns and component
between IC501 Pin67 and PMC01
Pin1 short?
Check the Capstan Motor Ass’y.
NO