LG VC-9700 Service manual
DVD-VCR
SERVICE MANUAL
MODEL : VC9700(V9732CP1Z)
CAUTION
BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”
IN THIS MANUAL.
MODEL : VC9700(V9732CP1Z)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
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 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 MANUFACTURER’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 PROTECTION 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.
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 CIRCUIT MODIFICATIONS.
7. AFTER RE-ASSEMBLY OF THE SET ALWAYS PERFORM AN A.C.
LEAKAGE TEST ON ALL EXPOSED METALLIC PARTS OF THE CABINET, (THE CHANNEL SELECTOR KNOB, ANTENNA TERMINALS. HANDLE 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. VOLTMETER, HAVING 5000 OHMS PER VOLT OR MORE SENSITIVITY, IN
THE FOLLOWING MANNER; CONNECT A 1500 OHM 10 WATT RESISTOR, PARALLELED BY A .15 MFD. 150.V A.C TYPE CAPACITOR
BETWEEN A KNOWN GOOD EARTH GROUND (WATER PIPE, CONDUIT, 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 MAGNITUDE TO CONSTITUTE A RISK OF ELECTRIC SHOCK.
THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE 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 PERSONNEL COVER THE SUBJECT OF X-RADIATION. THE ONLY POTENTIAL SOURCE OF X-RAYS IN CURRENT T.V. RECEIVERS IS THE PICTURE 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. OPERATION AT HIGHER VOLTAGES MAY CAUSE A FAILURE OF THE PICTURE TUBE OR HIGH VOLTAGE SUPPLY AND, UNDER CERTAIN CIRCUMSTANCES, MAY PRODUCE RADIATION IN EXCESS OF DESIRABLE 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 ORGANIZATION REVIEW TEST PROCEDURES SO THAT VOLTAGE REGULATION IS ALWAYS CHECKED AS A STANDARD SERVICING PROCEDURE. 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, CUBBYHOLE 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 RADIATORS WHERE STEAM LEAKAGE IS A FACTOR, ETC.
3. AVOID PALCEMENT WHERE DRAPERIES MAY OBSTRUCT REAR
VENTING. THE CUSTOMER SHOULD ALSO AVOID THE USE OF DECORATIVE SCARVES OR OTHER COVERINGS WHICH MIGHT
OBSTRUCT VENTILATION.
4. WALL AND SHELF MOUNTED INSTALLATIONS USING A COMMERCIAL 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 HAZARDS 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 SINGLE 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 follow the
SAFETY PRECAUTIONS. NOTE : if unforeseen circumstances create conflict between the following servicing
precautions and any of the safety precautions in this publications, 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.
(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 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 resistance between each blade of the attachment plug and accessible conductive parts (Note 1) should be more than 1Mohm.
Note 1 : Accessible Conductive Parts including Metal panels, 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 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 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 electricity sufficient to damage an ES device.)
1-7
SPECIFICATIONS
• GENERAL
Power requirements AC 200-240V, 50/60 Hz
Power consumption 17W
Dimensions (approx.) 430 X 78.5 X 275 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 24 Hours display type
RF Modulator UHF 22-68 (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) : 8Hz to 44 kHz
DVD (PCM 48 kHz) : 8Hz to 22 kHz
CD: 8 Hz to 20kHz
Signal-to-noise ratio More than 100dB (ANALOG OUT connector only)
Harmonic distortion Less than 0.008%
Dynamic range More than 100dB (DVD)
More than 95dB (CD)
• INPUTS (VCR)
Audio -6.0dBm, more than 10 kohms (SCART)
-6.0dBm, more than 47 kohms (RCA)
Video 1.0Vp-p, 75 Ω, unbalanced (SCART/RCA)
RF IN PAL B/G
• OUTPUTS (DVD)
VIDEO OUT 1 Vp-p 75 Ω, negative sync
COMPONENT VIDEO OUT (Y) 1Vp-p, 75 Ω, negative sync., RCA jack x 1
(Progressive Scan) (Pb)/(Pr) 0.7 Vp-p 75 Ω, RCA jack x 2
Audio output (digital audio) 0.5 V (p-p), 75 Ω, RCA jack x 1
Audio output (optical audio) 5.0 V (p-p), 75 Ω, Optical connector x 1
Audio output (analog audio) 2.0 Vrms (1 kHz, 0 dB), 600 Ω,
RCA jack (L, R) x 1 / SCART (TO TV)
• OUTPUTS (VCR)
Audio -6.0dBm, less than 1 kohms (SCART)
Video 1.0 Vp-p, 75 Ω, unbalanced (SCART)
• OUTPUTS (VCR)
S-Video (Y) 1.0 V(p-p) 75 Ω, negative sync., Mini Din 4-pin x 1
(Y) 0.3 V(p-p) 5 Ω
*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
A
5
4
3
2
1
BCD
463
470
463
457
469
A47
324
A46
8
28
323
274
5
6
2
463
465
25 0
463
471
A00
A44
61
2
30
3
0
30
61
2
61
A43
2
61
2
469
463
A50
284
280
283
286
A26
285
452
0
6
2
2-3
2. Packing Accessory Section
810
808
BATTERY
REMOTE CONTROLLER
900
ASSEMBLY
803
PACKING, CASING
CABLE ASS'Y RF
OPTIONAL PARTS
806
811
PLUG ASS'Y 1WAY
812
PLUG ASS'Y 2WAY
INSTRUCTION ASSEMBLY
801
PACKING, CASING
803
RF CABLE
BAG
804
802
BOX
3-1
SECTION 3
ELECTRICAL
CONTENTS
OVERALL WIRING DIAGRAM.....................3-2
VCR PART
ELECTRICAL ADJUSTMENT
PROCEDURES ..................................................3-4
ELECTRICAL
TROUBLESHOOTING GUIDE
......................3-5
1. POWER(SMPS) CIRCUIT .............................3-5
2. SYSTEM/KEY CIRCUIT ................................3-8
3. SERVO CIRCUIT ...........................................3-9
4. Y/C CIRCUIT................................................3-12
5. HI-FI CIRCUIT..............................................3-16
6 TUNER/IF CIRCUIT ......................................3-19
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 ........3-30
2. TU/IF CIRCUIT DIAGRAM ..........................3-32
3. A/V CIRCUIT DIAGRAM .............................3-34
4. Hi-Fi CIRCUIT DIAGRAM ...........................3-36
5. SCART(JACK) CIRCUIT DIAGRAM...........3-38
6. SYSTEM CIRCUIT DIAGRAM.....................3-40
• WAVEFORMS................................................3-42
• CIRCUIT VOLTAGE CHART.........................3-44
• IC BLOCK DIAGRAMS.................................3-50
PRINTED CIRCUIT DIAGRAMS ...............3-54
1. MAIN P.C.BOARD (TOP SIDE) ...................3-54
2. MAIN P.C.BOARD (BOTTOM SIDE) ...........3-57
3. POWER P.C.BOARD ...................................3-60
4. KEY P.C.BOARD .........................................3-60
DVD PART
ELECTRICAL TROUBLESHOOTING
GUIDE
.................................................................3-62
1. SYSTEM OPERATION FLOW.....................3-62
2. SYSTEM TEST FLOW.................................3-63
DETAILS AND WAVEFORMS ON SYSTEM
TEST AND DEBUGGING
.............................3-69
1. SYSTEM 27MHZ CLOCK, RESET,
FLASH R/W SIGNAL...................................3-69
2. SDRAM CLOCK ..........................................3-71
3. TRAY OPEN/CLOSE SIGNAL.....................3-71
4. SLED CONTROL RELATED SIGNAL
(NO DISC CONDITION)...............................3-72
5. LENS CONTROL RELATED SIGNAL
(NO DISC CONDITION)...............................3-72
6. LASER POWER CONTROL RELATED
SIGNAL(NO DISC CONDITION) .................3-73
7. DISC TYPE JUDGEMENT WAVEFORM ....3-73
8. FOCUS ON WAVEFORM ............................3-75
9. SPINDLE CONTROL WAVEFORM
(NO DISC CONDITION)...............................3-76
10. TRACKING CONTROL RELATED
SIGNAL(SYSTEM CHECKING) ................3-77
11. ZR36868 AUDIO OPTICAL AND COAXIAL
OUTPUT(SPDIF)........................................3-78
12. ZR36868 VIDEO OUTPUT WAVEFORM ..3-78
13. ZR36868 AUDIO OUTPUT TO
AUDIO DAC...............................................3-79
14. AUDIO OUTPUT FROM AUDIO DAC .......3-80
BLOCK DIAGRAMS ......................................3-81
1. OVERALL BLOCK DIAGRAM ....................3-81
2. SERVO BLOCK DIAGRAM.........................3-82
3. VIDEO & AUDIO BLOCK DIAGRAM..........3-83
CIRCUIT DIAGRAMS ....................................3-84
1. SYSTEM CIRCUIT DIAGRAM.....................3-84
2. RF & DSP SERVO CIRCUIT DIAGRAM .....3-86
3. AV/JACK CIRCUIT DIAGRAM ....................3-88
• IC BLOCK DIAGRAMS.................................3-90
3-4
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 CH2 to the Video Out for the VCR.
c) Trigger the mixed Combo Video Signal of CH2 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 (412µs, 1H=63µs).
• PG Adjustment Method
a-1) Payback the SP standard tape
b-2) 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-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
• 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
3-5
ELECTRICAL TROUBLESHOOTING GUIDE
NO
Check or Replace
the D102
Replace the D123
Replace the D124
Replace the D121
YES
YES
Is the D121
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 D102
normal?
Replace the D125
Replace the IC103
YES
YES
YES
YES
YES
YES
YES
Is Vcc (9V - 18V) supplied to IC101 Pin2?
Are the D125
normal?
Is there about 2.5V
at the IC103 Pin1?
Is the D123
normal?
Is the D124
Normal?
(1) No 5.3VA
3-6
No 33V
Is the Vcc(33V) supplied to Q161 Emittor?
Check or Replace
the D121
Is the Q162 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 D125
Is the Vcc(5.3V) supplied to Q165 Emittor?
Check or Replace
the Q165
Is the Q162 Base
‘H’?
NO
NO
Check the PWR CTL
“H” signal from µ-com
YES
YES
YES
(2) No 5.0V_D
No 5.0V_T
Check or Replace
the D125
Check the PWR CTL
“H” signal from µ-com
Is the Vcc(5.3V) supplied to Q163 Emittor?
Is the Q162 Base
‘H’?
Check or Replace
the Q163
NO
NO
YES
YES
YES
(3) No 5.0V_T
No 3.3V
Check or Replace
the D123
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
3-7
No Motor_Vcc
Check or Replace
the D124
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 REG 12V
Is the Vcc(14V) supplied
to Q165 Collector?
YES
Is the Vcc(14V) supplied to Q165 Base?
YES
Check or Replace
the Q165
YES
(7) No REG 12V
Check or Replace
the D124
NO
NO
Check the PWR CTL
“H” signal from µ-com
3-8
2. SYSTEM/KEY CIRCUIT
(1) AUTO STOP
(2) The unstable loading of a Cassette tape
Auto Stop
Does the SW25 waveform
appear at the IC501
Pin23?
Do the T-UP Reel Pulses
appear at the IC501 Pin3?
Is 12V 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 Pin32 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
3-9
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 Pin82?
Replace the IC501.
YES
YES
YES
YES
YES
NO
NO
(2) When the Drum Motor
(2) 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 “(2)
No 12VA 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
Pin12 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 Pin12 short?
When the Drum Motor
doesn’t run,
Does 12V appear at the
PMC01 Pin8?
Does 2.8V appear at the
PMC01 Pin12?
Check the connector
(PMC01) and the Drum
Motor Ass’y.
NO
YES
YES
YES
NO
NO
NO
NO
NO
YES
YES
YES
3-10
Does the CFG signal appear at the
PMC01 Pin1?
Does the PWM signal appear at the
IC501 Pin33?
Does 2.8V 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 12VA appear at the PMC01?
YES
Replace the IC501.
YES
NO
NO
YES
Refer to “SMPS(CAPSTAN/12Volt)
Trouble Shooting”.
Aren’t the foil patterns and component
between IC501 Pin67 and PMC01
Pin1 short?
Check the Capstan Motor Ass’y.
NO
3-11
KEY doesn’t working.
Is 5V applied to the IC501
Pin36?
Does LED or FLD change
when a function button is
pressed?
Refer to “SMPS 5.3VA
Trouble Shooting”.
Replace the defective
switches.
YES
NO
NO
2. SERVO CIRCUIT
(4) KEY doesn’t working
3-12
4. Y/C CIRCUIT
(1) No Video in EE Mode,
No Video in EE Mode
Check the 19Pin of Tuner.
Does the Video signal
appear at the IC301 Pin48?
Is 5V applied to the IC301
Pins18, 24, 42, 55, 72, 91?
Does the Video signal
appear at the IC301 Pin65?
Does the Video signal
appear at the IC501 Pin47?
Does the Video signal appear
at the Emitter terminal of the
Q309?
Check the 5.0VT, 5.3VA
Line. (Power Circuit)
Is I2C BUS signal applied to
the IC301 Pins68, 69?
Check C316. (AGC)
Chck the path of the signal
between the IC301 Pin65
and IC501 Pin49.
Replace the IC301.
Does the 12VT, 5.3VA
appear at the Emitter
terminal of the Q309.
Replace the Q309.
Check the 12VT, 5.4VA
Line. (Power Circuit)
Check the System Circuit.
(Refer to ‘SYSTEM I2C BUS
CHECK Trouble Shooting’)
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
3-13
3. Y/C CIRCUIT
(2) When the Y(Luminance) signal doesn’t appear on the screen in PB Mode,
Is 5.0VT, 5.3VA applied to the
IC301 Pins24, 42, 55, 72, 91?
Is the I2C Bus siganl applied
to the IC301 Pins68, 69 ?
Does the normal RF signal
appear at the IC301 Pin78?
Check the line of the 5.0VT,
5.3VA Line. (Power Circuit)
Check the System Circuit.
(IC501 Pin23)
Check the V.H.S/W level.
(Check R303, R304)
Replace the IC301.
Refer to ‘SYSTEM I2C BUS
CHECK Trouble Shooting’.
Is the V.H.S/W signal
applied to the IC301 Pin70?
Is V.H.S/W “H” about 3.4V
at the IC301 Pin70?
Clean the Drum.
Check the path of the
Y(Luminance) RF signal.
(Check C327)
Check the path of the
Y(Luminance) RF signal.
(Check the C312)
Does the Y(Luminance) RF
signal appear at the IC301
Pin79?
Is the Y(Luminance) Video
waveform showed up at
theIC301 Pin43?
Replace the IC301.
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
3-14
3. Y/C CIRCUIT
(3) When the C(Color) signal doesn’t appear on the screen in PB Mode,
Is 5.0VT/5.3VA applied to the
IC301 Pins24, 42, 55, 72, 91.
Is the Color Rotary signal
applied to the IC301
Pin70?
Check the line of the 5.0VT/
5.3VA Line. (Power Circuit)
Replace the X301.
Check the Color Pass.
Check the Color Rotary
Circuit. (IC501 Pin98 )
Check the Color Rotary
level. (Check the R303)
Does the X301(4.43MHZ)
oscillate?
Replace the IC301.
Does the Color signal
appear at the IC301 Pin21?
Is Color Rotary “H”
about 3.4V?
Replace the IC301.
NO
NO
NO
YES
YES
YES
YES
NO
NO
NO
YES
Does the Color signal
appear at the IC301
Pin25 ?
3-15
3. Y/C CIRCUIT
(4) When the Video signal doesn’t appear on the screen in REC Mode,
Is the EE signal normal?
Is 5.0VT/5.3VA applied to the
IC301 Pins24,42,55,72,91?
Does the RF signal appear
at the IC301 Pin78?
Check EE Mode.
Check the System of REC
‘H’. (the IC501 Pin27
/ the D301)
Replace the IC301.
Check the line of the 5.0VT/
5.3VA Line.(Power Circuit)
Check PB Mode.
Is the REC ‘H’ signal
(about 4V) applied to the
IC301 Pin80?
Check the circuit of the
IC301 Pins85, 86.
Check REC Luminance
Pass & Color Pass.
Does PB Mdoe operate
normally?
Does the REC RF signal
appear at the IC301
Pins88,89,94,95?
Check the Drum &
Drum Connector
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
YES
YES
YES
3-16
5. Hi-Fi CIRCUIT
(A) No Sound(EE Mode)
YES
No Sound.
Check the TU Audio of IC801
Pins2, 3.
Check the DVD Audio of IC801
Pins4, 5.
Check the AV1 Audio of IC801
Pins6, 7.
Check the AV2 Audio of IC801
Pins8, 9.
Check the AV3 Audio of IC801
Pins10, 11.
Check the Vcc of IC801 Pins34, 40,
IC802 Pin13.
YES
Check the IIC Clock and DATA at
IC801 Pins42, 43.
YES
Check the Audio of IC801 Pins16, 17.
YES
Check the Audio of IC802 Pins1, 14.
YES
Check the JK902, SC901.
Check the IC751 Pins30, 31.
NO
Check the DVD Audio OUT.
(JK902 DVD_A_L_L/R).
NO
Check the Scart1 Jack.
(SC901 Scart1 Audio in Pins2, 6).
NO
NO
Check the front Jack.
Check the Scart2 Jack.
(SC901 Scart2 Audio in Pins2, 6).
NO
Check the Power 5.0V, 12VT.
YES
NO
Check the IC501 Pins17, 18.
NO
Replace IC801.
Replace IC802.
NO
NO
3-17
3. Y/C CIRCUIT
(B) Hi-Fi Playback
YES
YES
YES
YES
PB mode
No Sound.
Check the Vcc of IC801
(Pins34, 40)
Check the Hi-Fi Selection switch.
(IC801 Pin41) and the Tape quality.
Is the RF Envelope at
IC801 Pin44 over 2Vp-p?
YES
Check IC801 Pin42(Data),
Pin43(Clock)
YES
Do Audio Signals appear at
IC801 Pin16(L-CH), 17(R-CH)?
YES
Do Audio Signals appear at
IC802 Pin10(L-CH), 16(R-CH)?
YES
YES YES
Do Audio Signals appear at
IC802 Pins11, 16?
Do Audio Signals appear at
JK902?
Check Power 5.0V, 12VT.
NO
Check IC501 Pin26
(A.H/SW)
NO
NO
Check the parts of µ-COM
(IC501 Pins17, 18)
NO
Check the Connection at
P3D01 Pins7, 9.
NO
Check the A.IN line of
IC802(C850, C852)
NO
Check the Vcc of IC802
Pin13.
Replace IC802.
Check the Jack(JK902)
NO
NO
Check Power.
NO
3-18
(C)
Hi-Fi REC.
It can’t be recorded Hi-Fi Audio
signal.
Check Vcc of IC801.(Pins34, 40)
YES
YES
Check IC801 Pin42(Data), Pin43(CLOCK).
YES
Do Audio signals appear at IC801
Pins16, 17?
YES
Do FM Audio signals appear at IC801
Pin36?
YES
Check the Contact Point of Drum
Connector if good then Replace the Drum.
YES
Check Power 5V, 12V.
NO
Check ports of µ-COM.
(IC501 pins 17, 18)
Check Audio input signal of IC801
Pins2, 3(TU.A.), 4, 5(DVD.A.),
6, 7(AVI.A.), 8, 9(AV2.A.), 10, 11(AV3.A.).
NO
Replace IC801.
NO
NO
3-19
6. Tuner/IF CIRCUIT
(A) No Picture on the TV screen
No picture on the TV
screen
Does the Video signal at
the TU701 Pin19.
YES
YES
YES
Is 33VT applied to TU701
Pin17?
YES
Is 5VT applied to TU701
Pin4?
NO
Does Sync appear at
IC501 Pin111.
NO
Does the Video signal at
the IC501 Pin47.
YES
NO
Does the Video signal at
the IC301 Pin61.
YES
NO
NO
Does the Video signal at
the IC903 Pin6.
Check the signal flow from IC903
Pins26, 27 to SC901 Pin19.
YES
YES
Check 33V line.
NO
Check 5V line.
NO
YES
Does the Clock signal
appear at TU701 Pin12?
Check the lIC Clock Signal
of µ-COM Pin18.
NO
YES
Does the data signal
appear at TU701 Pin13?
Replace Tuner.
Check the signal flow from
TU701 Pin19 to IC301 Pin48.
Check the signal from IC301
Pin65 to IC501 Pin49.
Check the signal from IC501
Pin47 to IC301 Pin56.
Check the signal from IC903
Pin6 to IC301 Pin61.
Check the lIC Data Signal
of µ-COM Pin17.
NO
3-20
(B) No Sound
No Sound.
Check the Vcc of IC751 Pins1, 11, 19,
22, 33.
YES
Check 5.0V Line.
NO
Check the Tuner SiF signal at IC751
Pin2.
YES
Check the oscillator of IC751 Pins5, 6.
YES
Check the Audio of IC751 Pins30, 31.
YES
Check the Audio of IC801 Pins2, 3.
YES
Check the Audio of IC801 Pins16, 17.
YES
Check the Audio of IC802 Pins3, 5.
YES
Check the Signal flow from IC802
Pins3, 5, SC901 Pins1, 3.
YES
Check the Tuner SIF of TU701 Pin22.
NO
Replace X751
NO
Check the IIC Clock and Data at IC751
Pins12, 13.
NO
Check the signal flow from IC751
Pins30, 31 to IC801 Pins2, 3.
NO
Check the IIC Clock and Data at IC801
Pins42, 43.
NO
Check the signal flow from IC801
Pins16, 17 to IC802 Pins11, 16.
NO
3-56
LOCATION GUIDE
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