Page 1
DVD-VCR
SERVICE MANUAL
MODEL : VC9700(V9732CP1Z)
CAUTION
BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”
IN THIS MANUAL.
MODEL : VC9700(V9732CP1Z)SERVICE MANUAL
Page 2
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
Page 3
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
Page 4
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
Page 5
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.)
Page 6
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.
Page 7
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
Page 8
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
Page 9
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
Page 10
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
Page 11
Page 12
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
Page 13
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
Page 14
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
Page 15
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
Page 16
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
Page 17
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
Page 18
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
Page 19
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
Page 20
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
Page 21
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
Page 22
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 ?
Page 23
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
Page 24
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
Page 25
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
Page 26
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
Page 27
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
Page 28
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
Page 29
Page 30
3-56
LOCATION GUIDE
Page 31
3-57
LOCATION GUIDE
Page 32
3-2 3-3
OVERALL WIRING DIAGRAM
DECK
SMPS
MD
BOARD
KEY
BOARD
123456789
RF
DVD_LD
DVD_PD
VOL(DVD)
GND
Vcc(HF)
PMD01 PMD02
123456789
10111213141516171819202122
F
E
A
B
D
C
Vcc(HF)
VC_INPUT
10111213141516171819202122
F(+)
T(-)
T(+)
F(-)
Vcc
GND
CD_LD
CD_PD
23
VOL(CD)
23
Hi-Fi REC
Hi-Fi PB B
PMC01
123456789
CFG
12VA(CAP)
123456789
5.2VA
I-limit
CAP REV'H'
GND
12VA(DRUM)
MOTOR GND
CAP CTL
101112
LD IN
DFG/FG
101112
12345
P3D02
CTL(+)
DRUM CTL
12345
A/E(+)
CTL(-)
A/E(-)
6
A.PB
A.REC
6
1
GND
P3D03
1
2
FULL ERASE
2
123456789
GND8VGND
PPM01
REG_9V
REG_12V
MOTOR_Vcc
123456789
ONE
33V
3.3V
PWR_CTL'H'
101112
GND
5.3VA
101112
13
5V
M5V/5VT
13
123456789
P3D01
SP PB A
123456789
K-RTN2
1
2
GND
1
2
SP REC
SP PB B
EP PB B
EP REC
EP PBA
Hi-Fi PB A
123456789
LM -
FM -
LM +
FM +
SPM -
SPM +
PMD03
123456789
GND
SW(OPEN)
SW(CLOSE)
11
10
GND
SW(LEAD IN)
11
10
BOARD
Page 33
Page 34
3-20 3-21
BLOCK DIAGRAMS
1. POWER(SMPS) BLOCK DIAGRAM
BD101
T101
!
TRANS
NOISE FILTER
BLOCK
(C101,L102,
C102)
!
FUSE
RESISTOR
(FR101)
BR BL
(BK)(WH)
!
Y-CAP
C110
C103
Y-CAP
+
!
C111
SNUBBER
BLOCK
(D101,C105
C106,R104)
657 8
DRIVE & S/W BLOCK
(IC101, D102, R105,
C104, C108 , C109,
C107,ZD102)
31
2
PHOTO COUPLER
(IC102)
!
ERROR
(IC103)
RECTIFIER &
SMOOTING BLOCK
(D124,C124,C134,
R121,L124,C121)
RECTIFIER &
SMOOTING BLOCK
(D123,C127,C137,
L127)
RECTIFIER &
SMOOTING BLOCK
(D121,C126,R136)
RECTIFIER &
SMOOTING BLOCK
(D122, C128,
L128, C138)
FEED-BACK
(R141,R142,
C143,R143.
R144.R145
AMP
BLOCK
R146)
12V REG BLOCK
(Q166,ZD151,C160,
R166,C159)
3.3V REG BLOCK
(IC131,C158,R165)
33V S/W BLOCK
(Q161,R154,R155)
5V S/W BLOCK
(Q165,C164,R172,
R174)
5VT S/W BLOCK
(Q163,C162,D127,
R156,R157)
PWR CTL BLOCK
(Q162,C161,R164,
R163)
MOTOR VCC
14VA
REG12V
3.3V
33V
5.3VA
5.0V
M5V/5VT
PWR CTL'H'
Page 35
3-22 3-23
3. VPS BLOCK DIAGRAM
2. Tu/IF, NICAM & A2 BLOCK DIAGRAM
5.4VA
MOD_AUDIO
5V
MOD_VIDEO
33V
TU_SECAM_H
TU_SE_VL_H
IIC CLK
IIC DATA
SW1
SW2
AS
SIF
A.OUT
AFT
VPS_VIDEO
TU_A_R
TU_A_L
MSP3417
MSP3407
IIC CLK
IIC DATA
5V
AFT
TU_VIDEO
COMBI SCART
Page 36
3-24 3-25
4. Y/C BLOCK DIAGRAM
(PB Mode)
(REC Mode)
S1 V.OUT
S2 V.OUT
(MICOM)
V.OUT
C.SYNC
CLOCK
DATA
C.ROTARY
V.H.SW
65 63 61
69 68 67
70
Y/C MIX
60dB AMP
MAIN
DE EMP
SUB LPF
AGC
PB FM
Y-LPF
PB FM EQ FM OEM
46
YNR
43
Y-Delay
IC301
LA71750M
(1H/2H)
C-Delay
BPF
MAIN
CONV
ACCC LPF
LPF
CCD
DET
ACC
SYNC IN
29
CNC
IC201
18 14
LA70100M
2521
CLOCK
DATA
C.ROTARY
V.H.SW
REC'H'
DEC
V.IN3
FRONT
V.IN4
MICOM
V.OUT
C SYNC
29 16
IC201 LA70100M
79 78 76 75 70 69 68 67 65 59 58 54 52
80
2 12
V.IN1 TUNER
50 V.IN2 S1
48
SW
AGC
NL
EMPHA
W/D
CLIP
DETAIL
W/D
CLIP
Y-LPF FBC
ENH
46
REC
FM EQ
43
Y-DELAY
YNR
1H/2H
DELAY
BPF
IC301
LA71750M
AMP
COMP
Main
Conv
Main
Conv
Killer C-LPF ACC
33
KILL DEC
32
31
VX02 VX02
REC APC
CLK-IN
2928
4.43MHz
2721
79 78
95
94
89
88
LP REC
90
93
84V.ENV
87
96
(To Drum)
SP REC
(To Drum)
COMBI SCART
Page 37
3-26 3-27
5. Hi-Fi BLOCK DIAGRAM
VIDEO INPUT
BLOCK
AUDIO INPUT
BLOCK
Tu A.IN 'L'
Tu A.IN 'R'
DVD A.IN 'L'
DVD A.IN 'R'
EU1 A.IN 'L'
EU1 A.IN 'R'
EU2 A.IN 'L'
EU2 A.IN 'R'
A V2 A.IN 'L'
A V2 A.IN 'R'
10
11
A
B
1
2
3
4
5
6
7
8
9
Hi-Fi/
REC
37
36 35
Hi-Fi REC
Hi-Fi PB 'B'
Hi-Fi PB 'A'
IC801
21 22
A.OUT 'L'
16
A.OUT 'R'
17
EU2.A.OUT.L
19
EU2.A.OUT.R
20
OSD V. IN
8
16 3
11
IC802
DVD_H
DVD/R V. IN
9
1
142 12
RF_H
7
6
DVD_FR_VIDEO
A.OUT
5
To JACK
NORMAL AUDIO
OUT(T o AVCP)
NORMAL AUDIO
IN(From A VCP)
SCART 2
DVD A.IN 'L'
DVD A.IN 'R'
AUDIO INPUT BLOCK
MODULATOR
A.OUT
(To Tu)
COMBI SCART
Page 38
3-28 3-29
6. SYSTEM BLOCK DIAGRAM
LD(+)
LD(-)
R522, C568
L/M CONTROL
R525, R526
MN101D10X
Q504, 505
R506, 507, 508,
509, 511
C504, 511
L503, C507, C509
L504, C505, C506
2fsc
L505, Q506,
R537, 539, 584, 585,
C553, 554
COMBI SCART
Page 39
3-30 3-31
NOTES) Symbol denotes AC ground.
NOTES) Symbol denotes DC chassis ground.
NOTE) Warning
NOTE) Parts that are shaded are critical
NOTE) With respect to risk of fire or
NOTE) electricial shock.
A B C D E F G H I J K L M N O P Q R ST
CIRCUIT DIAGRAMS
1. POWER(SMPS) CIRCUIT DIAGRAM
IMPORTANT SAFETY NOTICE
WHEN SERVICING THIS CHASSIS, UNDER NO CIRCUMSTANCES SHOULD THE ORIGINAL DESIGN BE
MODIFIED OR ALTERED WITHOUT PERMISSION
FROM THE LG ELECTRONICS CORPORATION. ALL
COMPONENTS SHOULD BE REPLACED ONLY WITH
TYPES IDENTICAL TO THOSE IN THE ORIGINAL CIR-
CUIT. SPECIAL COMPONENTS ARE SHADED ON THE
SCHEMATIC FOR EASY IDENTIFICATION.
THIS CIRCUIT DIAGRAM MAY OCCASIONALLY DIFFER FROM THE ACTUAL CIRCUIT USED. THIS WAY,
IMPLEMENTATION OF THE LATEST SAFETY AND
PERFORMANCE IMPROVEMENT CHANGES INTO
THE SET IS NOT DELAYED UNTIL THE NEW SERVICE
LITERATURE IS PRINTED.
NOTE :
1. Shaded( ) parts are critical for safety. Replace only
with specified part number.
2. Voltages are DC-measured with a digital voltmeter
during Play mode.
Page 40
3-32 3-33
2. TU/IF CIRCUIT DIAGRAM
A B C D E F G H I J K L M N O P Q R ST
EE MODE(VIDEO)
TU MODE (AUDIO)
Page 41
3-34 3-35
3. A/V CIRCUIT DIAGRAM
A B C D E F G H I J K L M N O P Q R ST
1
4
5
2
7
8
13
11
12
2
3
9
10
14
6
2
PB SECAM COLOR
REC AUDIO
PB Y+C
PB Y
PB C
REC Y+C
REC Y
REC C
REC SECAM COLOR
PB AUDIO(MONO)
WAVEFORM
Audio Tracking is failed.
IC301 Pin 84 is defective.
EE, PB Screen doesn’t appear.
Q305 is defective.
PB COLOR Signal disappear.
IC301 Pin70 is defective.
PB COLOR Signal disappear.
X301 is defective.
D301or IC301 Pin 80
REC is defective.
PB and Recording is failed.
(IC301 doesn’t operate.)
IC301 Pin 69, 68 are defective.
Normal Audio signal is not recorded.
Q301, Q306 are defective.
No mono Audio Signal
in PB MODE.
Q302, Q303, Q314
are defective.
Page 42
3-36 3-37
4. Hi-Fi CIRCUIT DIAGRAM
A B C D E F G H I J K L M N O P Q R ST
PB
REC
44 Pin is defective.
Hi-Fi Audio is not appear.
IC801 Pins42, 43 aredefective.
All Audio is not appear.
Page 43
3-38 3-39
5. SCART(JACK) CIRCUIT DIAGRAM
A B C D E F G H I J K L M N O P Q R ST
Page 44
3-40 3-41
6. SYSTEM CIRCUIT DIAGRAM
1
3
4
8
5
6
7
2
WAVEFORM
A B C D E F G H I J K L M N O P Q R ST
Q501, Q503 are defective.
µ-COM is unstable.
IC505 is defective.
VCR will not operate.
X501 is defective.
CLOCK SETTING will
not operate.
X502 is defective.
µ-COM will not operate.
ES501, ES502, LD501 are
defective.
Auto Rew will not working.
RS501,RS502 are
defective.
Auto stop occures.
R575, R576, R577,
R578 are defective.
Deck will not operate.
Page 45
3-42 3-43
WAVEFORM & VOLTAGE SHEET
IC301 Pin 75
PB mode
500mvp-p
IC301 Pins 48, 50,
54, 56
Video in 1Vp-p
IC301 Pin 67
PB/REC mode
4.0Vp-p
IC301 Pin 100
REC mode
1.1Vp-p
IC301 Pin 3
REC mode
2.0Vp-p
IC301 Pin 65
PB mode
2.02Vp-p
IC301 Pin 43
PB mode
400mVp-p
IC301 Pin 28
PB mode
400mVp-p
IC301 Pin 68
PB/REC mode
5Vp-p
IC301 Pin 69
PB/REC mode
5Vp-p
IC301 Pins 21
REC mode
340mVp-p
IC301 Pins 25
PB mode
300mVp-p
IC301 Pin 29
PB mode
400mVp-p
IC301 Pin 70
PB mode
3.6Vp-p
* IC301 Oscilloscope Waveform * IC501 Waveform Photographs
V.HSW
(IC501 Pin 23)
1V/10mS
REC/PB MODE
DV.SYNC
(IC501 PIN 24)
1V/100uS
QUE/REV MODE
CTL(+)
(IC501 Pin 74)
1V/10mS
CTL(-)
(IC501 Pin 75)
1V/10mS
DFG/DFG
(IC501 PIN 65)
1V/10mS
REC/PB MODE
CFG
(IC501 Pin 67)
1V/10mS
V.IN
(IC501 Pin 49)
500mV/20uS
V.OUT
(IC501 Pin 47)
500mV/20uS
EE/PB MODE
Page 46
3-44 3-45
• CIRCUIT VOLTAGE CHART
EE PB
MODE
PIN NO.
1 1.6 1.58
2 4.3 2.6
3 4.3 2.6
4 1.62 1.6
5 1.66 1.6
6 2.15 1.6
7 4.3 2.7
8 5.2 5.1
9 5.2 5.1
10 0.01 0.01
11 4.4 2.5
12 4.4 2.6
13 4.3 2.7
14 4.3 2.39
15 4.3 2.67
16 4.3 2.5
17 1.6 3.4
18 1.6 1.8
19 0.01 0.01
20 4.3 2.58
21 5.2 5.18
22 0.01 0.01
23 1.6 1.88
24 4.3 2.58
25 4.3 2.58
26 1.6 1.61
27 1.6 1.61
28 0.01 3.25
1 1.28 1.28
2 0.01 0.01
3 1.32 1.32
4 0.03 0.05
5 0.04 0.05
6 5.03 5.03
7 1.32 1.32
8 0.01 0.06
1 1.63 1.62
2 0.002 1.08
3 1.64 1.64
4 0.002 0.002
5 0.02 0.01
6 4.92 4.9
7 2.48 2.47
8 2.48 2.48
9 0.002 0.002
10 2.45 2.44
11 4.9 0.008
12 4.9 0.008
13 3.1 0.04
14 3.28 3.28
15 3.28 3.28
16 1.44 1.45
IC201
IC302
IC401
EE PB
MODE
PIN NO.
1 5.51 5.52
2 5.52 5.52
3 5.51 5.47
4 12.12 0.0002
5 5.51 5.52
6 5.52 5.52
7 5.52 5.52
8 0.002 12.13
1 2.1 2.2
2 4.7 4.77
3 4.7 4.7
45 5
5 4.4 4.4
6 2.6 2.6
7 2.5 2.55
8 2.24 2.5
9 2.5 2.5
10 2.3 2
11 2 2.3
12 2.2 1.6
13 0.87 0.85
14 2.28 1.9
15 2.33 2.18
16 2 2.1
17 2 2.2
18 4.43 4.4
19 0.01 0.002
20 2 2
21 1.9 2
22 1.9 2.1
23 2 2.1
24 0.01 0.003
1 0.01 1.7
2 3.29 3.26
3 3.29 3.27
4 0.08 0.4
5 0.05 0.4
6 0.05 0.3
7 1.72 1.9
8 1.72 0.8
9 2.78 0.5
10 1.72 0.7
11 0.01 1.6
12 0.01 0.01
13 3.44 3.28
14 0.01 2.1
15 3.43 3.1
16 1.7 2.7
17 3.31 3.1
18 1.7 2.2
19 0.7 1
20 0.01 0.01
21 3.39 3.24
EE PB
MODE
PIN NO.
22 2.6 2.9
23 3.39 3.25
24 2.4 2.5
25 1.86 1.9
26 1 1.63
27 2.5 1.08
28 0.01 0.01
29 0.01 0.01
30 2.7 1.22
31 0.01 0.05
32 0.01 0.01
33 2.7 3.2
34 3.28 3.24
35 0.4 1.13
36 1.7 1.5
37 2 2.5
38 1.7 3.9
39 0.01 1.2
40 1.7 1.5
41 3.4 3.28
42 0.01 1.5
43 1.7 2.7
44 1.8 3.19
45 1.7 1.6
46 1.7 1.5
47 3.4 3.28
48 1.68 3.04
49 1.68 3.03
50 0.01 0.01
51 3.39 3.27
52 3.39 3.29
53 1.63 1
54 0.13 0.5
55 0.13 1.26
56 0.12 0.5
57 1.64 1
58 3.39 3.28
59 0.12 0.4
60 1.64 1.5
61 0.12 0.4
62 0.01 0.01
63 0.01 0.4
64 1.85 1.8
65 1.38 0.03
66 0.01 0.01
67 0.03 0.34
68 3.39 3.28
69 0.01 0.01
70 3.36 3.22
71 0.09 0.37
72 0.01 0.01
73 0.01 3.23
74 3.37 3.25
75 3.38 3.28
76 3.39 3.28
77 3.38 3.17
IC402
IC5F1
IC601
EE PB
MODE
PIN NO.
78 0.01 0.02
79 0.01 0.01
80 1.6 1.49
81 3.39 3.27
82 1.59 1.91
83 0.01 0.01
84 1.4 1.25
85 1.8 1.5
86 1.6 1
87 3.39 3.28
88 1.6 1.3
89 1.8 2
90 1.7 1.5
91 0.01 0.01
92 1.7 1.89
93 0.01 1.8
94 1.3 1.99
95 0.01 0.01
96 1.7 2.2
97 3.39 3.28
98 1.7 1.85
99 1.8 1.3
100 1.6 1.52
101 0.01 0.01
102 1.6 1.81
103 1.6 1.9
104 1.6 1.7
105 3.39 3.28
106 0.01 0.01
107 0.01 0.01
108 0.01 0.01
109 0.01 0.01
110 1.68 1.61
111 0.02 0.01
112 0.02 0.01
113 0.01 1.07
114 0.01 0.01
115 1.69 1.64
116 1.69 1.61
117 0.01 0.01
118 1.65 1.5
119 3.39 3.25
120 0.01 0.01
121 0.01 0.01
122 0.01 0.01
123 0.01 0.01
124 1.7 1.64
125 3.39 3.28
126 0.01 0.01
127 0.07 3.25
128 0.01 0.01
129 0.01 0.01
130 0.01 0.01
131 1.85 2.44
132 3.37 0.06
133 3.38 3.28
EE PB
MODE
PIN NO.
134 3.38 3.28
135 3.03 0.01
136 0.03 0.01
137 0.01 3.25
138 3.39 3.28
139 0.01 0.01
140 0.01 0.01
141 3.29 3.27
142 1.86 2.45
143 1.66 2.46
144 1.66 2.34
145 0.01 0.01
146 0.01 0.01
147 0.75 1.29
148 0.01 0.01
149 3.37 3.26
150 0.98 1.13
151 0.98 1.13
152 3.36 3.26
153 1.28 1.82
154 1.28 1.81
155 0.01 0.01
156 0.01 0.01
157 1.65 1.31
158 1.65 1.31
159 3.25 3.25
160 2.64 3.23
161 3.25 3.2
162 2.64 3.21
163 3.25 3.21
164 3.25 3.2
165 2.64 3.21
166 0.01 0.01
167 2.64 3.14
168 1.88 2.24
169 0.01 0.01
170 2.64 2.1
171 1.88 2.4
172 2 2.1
173 1.8 2.1
174 1.74 1.91
175 1.71 1.88
176 0.11 0.16
177 0.1 0.38
178 3.15 3.1
179 3.13 2.25
180 0.01 0.01
181 0.01 0.01
182 1.8 2.1
183 0.01 3.24
184 0.01 0.01
185 0.01 0.2
186 3.29 3.28
187 3.28 3.28
188 0.01 0.02
189 0.01 0.01
EE PB
MODE
PIN NO.
190 0.1 0.1
191 1.2 1.4
192 3.3 3.28
193 0.01 0.01
194 0.01 0.01
195 1.7 1.58
196 1.8 1.6
197 0.01 0.01
198 1.4 2.41
199 3.3 3.28
200 0.01 0.01
201 0.01 0.01
202 1.51 1.52
203 3.9 2.9
204 3.3 3.28
205 0.01 3.28
206 3.24 3.28
207 3.25 3.27
208 3.24 0.39
1 3.28 3.27
2 1.86 1.2
3 1.87 1.5
4 0 0.01
5 1.58 1.1
6 1.8 1.5
7 3.28 3.27
8 1.5 1.8
9 1.78 1.2
10 0.01 0.01
11 2.17 1.3
12 0.28 0.5
13 3.28 3.27
14 0.01 0.01
15 3.27 3.16
16 3.27 0.2
17 3.26 3.24
18 3.25 3.21
19 0.14 0.5
20 1.56 2.1
21 0.12 0.3
22 0.12 0.29
23 0.01 0.37
24 0 0.4
25 3.31 3.2
26 0.01 0.01
27 1.59 101
28 0.11 1.1
29 1.62 1.1
30 0.01 1.1
31 0.19 0.02
32 0.01 0.2
33 0.01 0.02
34 3.36 3.2
35 1.56 1.52
36 0.01 0.01
EE PB
MODE
PIN NO.
37 0.01 0.02
38 3.38 3.28
39 1.56 1.8
40 1.75 1.17
41 0.01 0.002
42 1.62 1.17
43 1.42 1.1
44 3.41 3.28
45 1.31 1.9
46 1.78 1.8
47 0 0.001
48 1.55 1.7
49 0.54 1.1
50 0.01 0.001
1 0.01 1.7
2 0.01 1.2
3 0.01 0.01
4 0.01 1.8
5 0.01 0.5
6 3.29 3.2
7 0.01 3.2
8 3.29 3.2
9 0.01 0.003
10 0 0.27
11 3.2 3.2
12 3.2 3.2
13 3.2 3.2
14 3.2 3.2
15 1.25 2.1
16 0.01 0.002
17 0.02 3.2
18 0.003 3.2
19 0.002 3.2
20 3.29 3.2
21 3.29 0.002
22 3.29 0.002
23 3.29 3.2
24 3.25 3.2
25 3.25 3.2
26 3.29 3.2
27 0.01 0.002
28 3.2 3.2
29 2.9 2.9
30 2.9 2.9
31 2.8 2.9
32 2.8 1.2
33 2.8 1.2
34 2.8 2.8
35 2.86 2.8
36 0.01 0.01
37 3.29 3.28
38 2.9 0.68
39 2.9 2.9
40 2.84 2.9
41 2.86 2.9
EE PB
MODE
PIN NO.
42 2.85 3.28
43 2.88 2.9
44 2.85 2.87
45 2.85 2.87
46 0.01 0.01
47 3.29 3.28
48 0.002 3.28
1 0.001 0.001
2 0.001 0.001
3 0.001 0.001
4 0.001 0.001
5 3.27 0.04
6 3.28 3.28
7 0.001 0.001
8 3.29 3.28
EE PB REC
MODE
PIN NO.
1 4.8 V 4.84 V 0.99 V
2 0.11 V 0.014 V 0.81 V
3 2.16 V 2.16 V 2.03 V
4 0.69 V 0.63 V 1.73 V
5 2.15 V 2.15 V 2.26 V
6 2.16 V 2.15 V 2.06 V
7 2.15 V 2.15 V 2.1 V
8 2.15 V 2.15 V 2.1 V
9 2.14 V 2.14 V 2.73 V
10 2.16 V 2.16 V 2.66 V
11 2.23 V 2.27 V 2.8 V
12 1.56 V 0.002 V 2.0 V
13 2.14 V 2.14 V 0.095 V
14 0.022 V 0.022 V 2.05 V
15 2.14 V 2.14 V 2.08 V
16 4.85 V 0.146 V 4.68 V
17 2.14 V 2.14 V 2.09 V
18 4.8 V 4.86 V 4.73 V
19 3.88 V 3.92 V 2.72 V
20 2.31 V 0.003 V 0.006 V
21 3 V 1.68 V 3.02 V
22 3.2 V 2.62 V 3.2 V
23 3.2 V 2.55 V 3.2 V
24 4.85 V 4.85 V 4.75 V
25 0.121 V 3.4 V 0.19 V
26 1.65 V 1.25 V 1.6 V
27 2.16 V 2.1 V 2.14 V
28 3.75 V 3.7 V 3.66 V
29 2.43 V 2.46 V 2.34 V
30 0.002 V 0.002 V 0.005 V
31 4.76 V 4.58 V 4.72 V
32 4.68 V 4.58 V 4.71 V
33 2.88 V 2.86 V 2.8 V
34 0.061 V 0.06 V 0.061 V
35 3.02 V 2.34 V 2.99 V
36 3.5 V 2.84 V 3.4 V
37 1.7 V 1.76V 1.61 V
38 2 V 2.05 V 1.94 V
39 8.65 V 8.6 V 8.38 V
40 0.002 V 0.003 V 0.006 V
41 0.002 V 0.003 V 0.006 V
42 4.8 V 4.8 V 4.68 V
43 2.4 V 2.67 V 2.17 V
44 13.8 mV 3.86 V 0.03 V
45 2.5 V 2.52 V 2.55 V
46 2.6 V 2.78 V 2.64 V
47 4.14 V 4.14 V 4.14 V
48 3.3 V 3.09 V 3.30 V
49 2.97 V 2.93 V 3.69 V
50 1.93 V 1.92 V 1.92 V
51 0.002 V 0.003 V 0.005 V
52 1.93 V 1.93 V 1.92 V
53 2.33 V 2.33 V 2.34 V
54 1.93 V 1.92 V 1.92 V
55 5.14 V 5.14 V 5.13 V
IC602
IC604
IC301
IC605
Page 47
22 3.82 V 3.82 V 3.82 V
23 3.86 V 3.84 V 3.86 V
24 3.87 V 3.84 V 3.87 V
25 3.87 V 3.9 V 3.87 V
26 0.76 V 0.003 V 0.76 V
27 0.001 V 0.003 V 0.005 V
28 3.84 V 3.83 V 3.83 V
29 3.86 V 3.86 V 3.86 V
30 0.77 V 0.76V 0.76 V
31 3.87 V 3.87 V 3.86 V
32 3.86 V 3.87 V 3.87 V
33 3.86 V 3.86 V 3.86 V
34 11.84 V 11.76 V 11.77 V
35 0.64 V 0.44 V 4.3 V
36 0.64 V 0.62 V 4.3 V
37 0.64 V 0.63 V 4.28 V
38 0.005 V 0.008 V 4.32 V
39 0.002 V 0.005 V 0.006 V
40 5 V 5.07 V 5.05 V
41 0.005 V 0.92 V 0.92 V
42 4.7 V 4.7 V 4.7 V
43 4.8 V 4.8 V 4.8 V
44 0.078 V 3.3 V 0.068 V
IC802
1 3.82 3.82 3.82
2 3.82 3.82 3.82
3 3.82 3.82 3.82
4 3.82 3.82 3.82
5 3.82 3.82 3.82
6 3.82 3.82 3.82
7 3.82 3.82 3.82
8 3.82 3.82 3.82
9 3.82 3.82 3.82
10 3.82 3.82 3.82
11 3.82 3.82 3.82
12 0.53 0 0
13 3.9 3.87 3.91
14000
15000
16 6 6 6.08
17 6 6.09 6.08
18000
19 6 6.08 6.09
20 6 6.09 6.09
21 4.6 6 4.59
22 3.82 3.82 3.82
23 3.87 3.79 3.86
24 3.87 3.88 3.88
25 3.87 3.11 3.87
26 0.75 0 0.75
27000
28 3.84 3.84 3.84
29 2.64 3.87 3.87
30 0.74 0.74 0.73
31 3.88 3.88 3.88
32 3.88 3.82 3.88
3-46 3-47
EE PB REC
MODE
PIN NO.
56 2.24 V 2.57 V 2.22 V
57 1.95 V 2.28 V 0.006 V
58 3 V 2.55 V 3.01 V
59 2.9 V 2.93 V 2.92 V
60 1.47 V 1.54 V 1.48 V
61 1.8 V 2.44 V 1.79 V
62 0.087 V 0.09 V 0.088 V
63 1.8 V 2.55 V 1.78 V
64 0.002 V 0.003 V 0.006 V
65 1.71 V 0.002 V 1.69 V
66 0.002 V 0.003 V 0.006 V
67 0.005 V 0.07 V 0.44 V
68 4.8 V 4.8 V 4.78 V
69 4.7 V 4.7 V 4.7 V
70 7.75 V 2.55 V 5.55 V
71 5.55 V 0.008 V 0.008 V
72 4.84 V 4.8 V 4.72 V
73 2.21 V 2.2 V 2.24 V
74 2.45 V 2.6 V 2.43 V
75 2.38 V 0.72 V 2.38 V
76 2.4 V 0.81 V 2.39 V
77 1.58 V 1.6 V 1.48 V
78 2.44 V 3.35 V 2.33 V
79 1.73 V 1.67 V 2.51 V
80 0.98 V 0.98 V 4.46 V
81 1.1 V 1.13 V 1.15 V
82 0.003 V 0.004 V 0.006 V
83 1.65 V 1.03 V 1.41 V
84 0.258 V 2.5 V 0.014 V
85 0.002 V 0.003 V 1.38 V
86 0.251 V 0.014 V 1.98 V
87 0.77 V 0.78 V 0.78 V
88 0.77 V 0.78 V 0.77 V
89 0.77 V 0.78 V 0.77 V
90 0.77 V 0.78 V 0.77 V
91 4.85 V 4.83 V 4.74 V
92 2.1 mV 0.004 V 0.006 V
93 1.7 V 1.72 V 3.94 V
94 1.7 V 1.71 V 3.93 V
95 1.7 V 1.71 V 3.92 V
96 1.7 V 1.71 V 3.94 V
97 0.002 V 0.005 V 0.006 V
98 2.16 V 2.16 V 2.21 V
99 2.16V 2.16 V 2.25 V
100 2.16 V 2.16 V 2.31 V
1 0 0.1 0
2 4.93 4.9 4.2
3 4.93 4.9 4.8
4 4.76 4.7 4.7
5 4.78 4.7 4.75
6000
7000
8 5.12 5.1 5.1
9 5 5 4.9
10 4.16 4.98 1.3
IC501
EE PB REC
MODE
PIN NO.
11 4.16 3.19 3.19
12 4.15 3.19 3.1
13 2.4 2.6 2.68
14 5.12 5.1 5.1
15 1.7 1.6 1.8
16 0 0 0
17 5.18 5 5
18 5.1 5 5
19 2.6 2.5 2.56
20 0 0 0
21 0 0 0
22 1.9 2.2 1.8
23 2 2.57 2.57
24 0.1 0 0
25 5.1 5.1 5
26 2.6 2.5 2.53
27 0 0 4.6
28 4.85 4.85 4..84
29 0 0 0
30 0 0 0
31 0 0 0
32 0 0 0
33 0 2.67 2.68
34 0 2.5 2.63
35 0 0 0
36 5.1 5.1 5.13
37 5.14 2.56 2.57
38 2.34 2.4 2.38
39 0 0 0
40 5.1 1.96 2.23
41 2.5 2.5 2.53
42 0 0 0
43 0 0 5.1
44 5.1 5.1 5.1
45 5.1 5.1 5.1
46 0 0 0
47 1.6 1..6 1.6
48 0 0 0
49 1.43 1.86 1.27
50 2.13 2.44 2.63
51 5 5 4.9
52 2.97 2.43 2.96
53 2.45 2.46 2.41
54 2.4 2.43 2.39
55 2 2 1.94
56 0 0 0
57 0 0 0
58 4.4 0 4.5
59 0 0 0
60 5 4.7 5
61 4.73 4.7 4.7
62 0 0 0
63 0 0 0
64 5 5 0
65 0 0 1.3
66 1.7 2.4 1.9
+-
STOP PLAY
-+
Tran-
sistor
C201 5.14 0 5.15 0
C208 3.26 3.12 3.24 2.29
C209 3.26 3.12 3.24 3.11
C214 5.26 0 5.2 0
C221 0 2.11 0 2.11
C310 0.00 0.00 0.00 0.00
C311 2.34 0.38 2.32 0.00
C312 2.34 0.00 2.32 0.00
C315 2.35 0.00 2.33 0.00
C318 2.30 0.00 2.30 0.00
C319 1.54 0.00 1.63 0.00
C324 3.04 1.74 3.00 1.46
C325 5.04 0.00 5.00 0.00
C327 1.45 0.00 1.59 0.00
C328 2.28 0.00 2.28 0.00
C329 2.27 0.49 2.27 0.53
C330 4.02 0.00 4.02 0.00
C331 2.57 1.74 2.27 1.74
C332 2.64 0.00 2.73 0.00
C333 2.95 2.20 2.96 2.25
C334 3.07 0.00 3.08 0.00
C335 2.53 0.01 2.42 0.00
C339 4.90 0.00 4.96 0.00
C362 0.00 0.00 0.00 0.00
C363 0.16 0.00 0.12 0.00
C367 2.27 1.78 2.27 1.33
C402 4.69 0 4.92 0
C405 2.35 0 2.45 0
C406 5.47 2.37 5.44 2.48
C407 5.47 0 5.44 0
C408 5.47 2.37 5.44 2.48
C413 11.9 0 12 0
C414 5.17 0.01 5.44 0
C415 5.47 0.01 5.44 0
C500 5.2 0 5.19 0
C503 5.04 0 5.04 0
C516 4.83 0 4.82 0
C526 13.89 0 13.8 0
C531 3.26 2.1 3.39 2.2
C534 4.38 0 4.38 0
C535 4.4 0 4.4 0
C546 13.95 0 14 0
C561 5.22 0 5.19 0
C578 2.6 0 2.59 0
C579 2.6 0 2.59 0
C584 2.6 0 2.59 0.01
C586 5.21 0 5.17 0
C592 5.21 0 5.18 0
C5G1 4.7 0 4.43 0
C612 3.26 0 3.25 0
C614 3.23 0 3.22 0
C616 3.24 0 3.23 0
C618 1.8 0 1.8 0
C642 1.81 0 1.81 0
C643 3.26 0 3.25 0
C646 3.26 0 3.25 0
+-
STOP PLAY
-+
Tran-
sistor
C673 3.26 0 3.25 0
C701 16 0 16 0
C702 4.98 0 4.97 0
C702 4.99 0.00
C710 32.00 0.00
C712 5.79 0
C712 5.78 0.00
C801 4.3 0.01 4.29 0
C806 3.82 0 3.82 0
C807 3.85 0 3.85 0
C808 3.16 0 3.15 0
C816 2.53 0 2.54 0
C821 9.3 0 9.3 0
C826 0.26 0 0.61 0
C828 5.15 0 5.14 0
C829 2.55 0 2.55 0
C830 0.47 0 0.47 0
C831 2.57 0 2.57 0
C840 5.1 0 5.11 0
C842 5.1 0 5.15 0
C843 2.56 0 2.54 0
C846 2.58 0 2.54 0
C847 0.47 0 0.47 0
C851 4.28 0.02 4.2 0.1
C866 2.53 0 2.52 0
C871 2.59 2.59 0
C873 1.22 0 1.22 0
C876 3.84 0 3.84 0
C877 2.05 0 2.05 0
C879 4.54 0 4.53 0
C880 2.44 0 2.49 0
C881 3.85 0 3.84 0
C882 9.3 0 9.3 0
C883 3.18 0 3.15 0
C886 3.84 0 3.84 0
C887 4.07 0 4.08 0
C888 3.86 0 3.85 0
C889 3.9 0 3.92 0
C902 1.12 1 1.12 1
C902 1.10 0.91
C903 0.9 0.78 0.94 0.77
C904 1.4 1.28 1.41 1.28
C904 1.23 1.13
C911 2.4 0 2.68 0
C911 2.91 0.00
C916 5.11 0 5.12 0
EE PB REC
MODE
PIN NO.
67 2.56 2.2 1.4
68 0.2 1.8 2.4
69 2.57 2.56 1.58
70 2.57 2.56 2.56
71000
72 2.57 2.57 2.55
73 5.1 5.1 5.1
74 2.5 2.5 2.88
75 2.5 2.5 2.2
76 2.5 2.5 2.56
77000
78000
79 5.13 5.1 5.1
80 5.13 5.1 5.1
81 4.4 4.4 4.4
82 0 2.4 0
83 0 2.1 0
84000
85000
86 5.1 5.1 5.1
87 5.1 5.1 5.1
88 5.1 5.1 5.1
89000
90 5 5 5.1
91 5.1 5.1 4.97
92000
93 5 5 5.1
94 0 0 1.9
95000
96555
97000
98 5 5 2.5
99000
100 0 0 0.8
IC801
1 3.8 V 3.81 V 3.82 V
2 3.8 V 3.82 V 3.82 V
3 3.8 V 3.82 V 3.82 V
4 3.8 V 3.82 V 3.82 V
5 3.8 V 3.82 V 3.82 V
6 3.8 V 3.82 V 3.82 V
7 3.8 V 3.82 V 3.82 V
8 3.8 V 3.82 V 3.82 V
9 3.8 V 3.82 V 3.82 V
10 3.8 V 3.82 V 3.82 V
11 3.8 V 3.82 V 3.82 V
12 0.054 V ~ 0.048 V
13 3.87 V 3.8 V 3.99 V
14 0.008 V 0.003 V 0.011 V
15 0.008 V 0.006 V 0.01 V
16 6 V 6.07 V 6.07 V
17 6 V 6.07 V 6.08 V
18 7 V 6.07 V 0.11 V
19 6 V 6.06 V 0.028V
20 6 V 6.07 V 6.07 V
21 4.58 V 4.57 V 5.9 V
IC801
IC802
EE PB REC
MODE
PIN NO.
EE PB REC
MODE
PIN NO.
33 3.86 3.8 3.87
34 12 12.3 12.2
35 0.6 0.64 4.24
36 0 0.63 0
37 0.62 0.63 4.24
38 0 0 4.28
39000
40555
41 0 0.9 0.9
42 4.95 4.87 4.83
43 4.86 4.79 4.78
44 0.06 0.7 0.14
Q305
BASE 1.8 1.82 1.9
EMITER 2.5 2.5 2.54
COLECTOR
000
q801
BASE 0.68 -2 0.68
EMITER 0 0 0
COLECTOR
0 -0.42 0
q802
BASE 0.68 -2.05 0.68
EMITER 0 0 0
COLECTOR
0 -0.34 0
q902
BASE 0.76 0.76 0.76
EMITER 0 0 0
COLECTOR
000
q903
BASE 0.76 0.76 0.76
EMITER 0 0 0
COLECTOR
000
Q905
BASE 0.39 0.4 0.39
EMITER 1.03 1.02 1.02
COLECTOR
000
Q910
BASE 3.6 2 3.6
EMITER 4.22 2.7 4.28
COLECTOR
000
Q911
BASE 0 0 0
EMITER 0 0 0
COLECTOR
3.12 3.24 3.18
Q912
BASE 0 0 0
EMITER 0 0 0
COLECTOR2.64 3.24 3.21
Q913
BASE 0 0 0
EMITER 0 0 0
COLECTOR3.54 3.05 3.29
Q305
Q801
Q802
Q902
Q903
Q905
Q910
Q911
Q912
Q913
Page 48
3-48 3-49
Base Base
STOP PLAY
Emitter EmitterCollector Collector
Tran-
sistor
Q201 3.1 3.28 0.009 2.28 3.05 2.34
Q202 3.14 3.28 0.01 3.1 3.25 0.6
Q203 4.9 0.01 4.9 4.86 5.1 4.85
Q204 4.9 0.04 4.9 4.86 5.2 4.86
Q205 0.003 0.002 4.9 0.003 0.003 4.8
Q206 0.003 0.002 4.9 0.003 0.016 4.86
Q301 4.4 5.08 4.98 4.4 5.08 4.98
Q302 0.74 0.006 0.001 0.74 0.006 0.001
Q303 0.72 0.006 0.008 0.72 0.006 0.008
Q306 1.63 2.22 0.01 1.63 2.22 0.01
Q307 2.15 1.48 0.001 2.15 1.48 0.001
Q308 0.01 4.99 5.24 4.51 3.85 5.23
Q311 0.00 0.00 0.00 -2.20 0.24 3.51
Q403 0.002 1.55 0.76 0.002 0.009 -0.4
Q404 0.002 1.6 0.76 0.002 0.009 -0.6
Q405 2.54 3.27 3.25 3.23 3.26 -0.4
Q501 0.009 0.002 0.02 0.009 0.002 0.02
Q504 2.15 2.83 0.002 2.15 2.83 0.002
Q505 1.63 1.65 5.15 1.63 1.65 5.15
Q507 2.15 2.8 0.002 2.15 2.8 0.002
Q550 0.01 0.002 1.66 0.01 0.002 1.66
Q901 0.76 0.002 0.008 -0.48 0.002 0.004
Q701 5.78 5.03 5.24
Page 49
3-50 3-51
• IC BLOCK DIAGRAMS
IC101_ICE3B0565
IC131_78R33
IC102_LTV-817B
IC141_78R08
IC301_LA71750EM
IC3S1_LA70100M
IC501_MN101D10X
IC504_KIA7031P
IC503_24WC16P
IC751_MSP3417/3407IC5F1_PT6955
IC505_KIA7042
Page 50
3-52 3-53
IC7V1_SDA5650X IC802_NM1232
IC903_BH78968FS
IC803_LD1117A
IC801_§∂DA9605H
Page 51
3-54 3-55
PRINTED CIRCUIT DIAGRAMS
1. MAIN P.C.BOARD (TOP SIDE)
Page 52
3-58 3-59
2. MAIN P.C.BOARD (BOTTOM SIDE)
Page 53
3-60 3-61
4. KEY P.C.BOARD
LOCATION GUIDE
3. POWER P.C.BOARD
LOCATION GUIDE
Page 54
3-62
ELECTRICAL TROUBLESHOOTING GUIDE
1. System operation flow
Power On
No
Yes
Yes
Yes
No
No
No
Show LOGO
Tray Closed?
Tray Close to Closed position
SLED Moves to Inner Position
Recieve
OPEN/ CLOSE
Key?
Receive
CLOSE Key?
1. Stop Playback & Open Tray
2. Display tray open message & LOGO
1. Execute Pressed Key & IR Key
2. Systemoperati on Routi ne Loop
1. Judge whether have disc and disc type
2. Jump to related disc reading procedure
SLED at Inner
Side?
1. 8032 initializes SERVO, DSP & RISC registers
2. Write RISC code to SDRAM
3. Reset RISC
DVD PART
Page 55
3-63
2. SYSTEM Test flow
TEST
Check the AC Voltage
Power PCBA(110V or 220V)
YES
Switch on the Power PCBA
Is the DC Voltage
outputs OK?
(5V,1.8V,3.3V,8V,12V)
YES
Make sure the main PCBA don't
short on VCCs and switch it on.
NO
NO
Replace power PCBA or
AC transformer.
Repair or Replace Power PCBA
Is 3.3V and 1.8V DC
outputs normal on main
PCBA?
YES
Connect to PC CN601 Cable and
update the FLASH memory code.
Update FLASH
successfully?
YES
A
NO
NO
Check the regulators or related diodes.
1. Check 27MHz system clock.
2. Check system reset circuit.
3. Check FLASH R/W enable signal PRD,RWR.
4. Check CN601SIGNALS.
5. Check FLASH Memory related circuit.
Page 56
3-64
A
RESET or Power On.
Show LOGO?
YES
NO
Flash Memory operates
properly?
YES
SDRAM works properly?
YES
ZR36868 VIDEO outputs
properly?
YES
Have TV signal output?
YES
Check AV cable connection
to TV set.
NO
NO
NO
NO
Check connection lines between FLASH
& ZR36868 and the FLASH access time
whether is suitable or not.
Check connection lines between SDRAM
& ZR36868 and the SDRAM is damaged.
Check the related circuit of ZR36868
Check the filtering and amp circuit of
TV signal.
Does Tray move
inside when it is not
at closed position?
YES
B
NO NO
Normal TROUT &TRIN
signals?
YES
Normal TRCLOSE &
TROPEN signal?
YES
Normal LOAD+ & LOAD-
signal?
YES
Check the cable connection between
main PCBA and loader.
NO
NO
Check the load OPEN & CLOSE switch
Check the Tray control IO pins on
MT1389 & BA5954
Check the Tray control amplifying
circuit on Motor driver.
Page 57
3-65
B
Does
the SLED move
to inner side when it is at
outter position?
NO NO
Motor Driver STBY
Pin is High?
Check the connection line of
STBY signal.
YES
Do not put in disc and tray close.
YES
Is SLED_S
DC Level higher
than 1.4V?
YES
SLED+ and
outpup
SEDL-
properly?
YES
Check the cable connection with
MECHA.
NO
NO
Check the related circuit of
SLED_S.
Check the amp circuit on motor
driver.
Optical Lens has
movements for searching
Focus?
YES
C
NO NO
Check cable connect on with
pick-up head.
Proper
FOCUS_S outputs
to motor driver?
YES
Proper FACT- & FACT+
outputs?
YES
NO
Check FFOCUS_S connection on
ZR36868 and motor dirver.
Check the amp circuit on motor
dirver.
Page 58
3-66
C
Laser turns on when
reading disc?
YES
Put disc in? Laser off
YES
Disc ID is correct?
YES
NO NO
NO
NO
DVD_LD or CD_LD output
Collector voltage of
power transistor is OK?
Check cable connection between
transistor ouput and pick-up head.
Check DVD_LD & CD_LD signal
properly?
YES
YES
NO
Check the laser power circuit
on ZR36868 and connecting to
power transistor.
Check the related circuit on
laser power transistor
Does spindle rotate?
YES
D
NO NO
Check the cable connection
between spindle and main PCBA.
Proper
SPINDLE_S signal on
ZR36868
YES
MOT_SPDL-
& MOT_SPDL+ output
properly?
YES
NO
Check SPINDLE_S related
circuit on ZR36868
Check the spindle control
amp circuit of motor driver.
Page 59
3-67
D
YES
Focus ON OK?
YES
Track On OK?
YES
NO
NO
Proper signals on
A,B,C,D of ZR36868
YES
Check FOCUS_S signal
on ZR36868
Properly
TRACK_S signal
on ZR36868?
YES
TACT+ & TACToutput properly?
YES
Check cable connection on
pick-up head.
NO
NO
NO
Check connections between
ZR36868 and Pick-up head.
Check the TRACK_S
connection on ZR36868
and motor dirver.
Check the tracking control
amp circuit on motor
driver.
Disc is play ?
YES
E
NO
Check RF & VC signal waveform.
Page 60
3-68
E
Normal Audio output
when disc playba
Normal IR.VFD & Front
pannel key functions
TEST EN
ck?
YES
YES
D
NO
NO
?
Audio DAC received
correct data stream?
YES
Normal Audio DAC
out?
YES
Check Audio filter,amplify,mute
.
circuit
Communications between
IR.VFD Front pannel key & ZR36868
is normally?
YES
Check the cable connection on
Front pannel
.
NO
NO
NO
Check connection between
ZR36868 & Audio
Check the related
circuit of Audio
Check communication lines on
ZR36868.
DAC.
DAC.
Page 61
DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING
1. SYSTEM 27MHz CLOCK, RESET, FLASH R/W SIGNAL
1) ZR36868 main clock is at 27MHz(X501)
1.0V, 27MHz
FIG 1-1
2) ZR36868 reset is low active
PWR_CTL_H
5.3VA
M_RESET(FRONT)
FIG 1-2
3-69
Page 62
3-70
3) CN601 waveform during procedure(Downloading)
DUPTDO
DUPRDO
FIG 1-3
4) Flash R/W enable signal during download(Downloading)
FRD
FWR
FIG 1-4
Page 63
3-71
2. SDRAM CLOCK
DCLK = 135MHz, Vp-p=2.2, Vmax=2.7V
FIG 2-1
3. TRAY OPEN/CLOSE SIGNAL
1) Tray open/close waveform
OPEN
CLOSE
FIG 3-1
Page 64
3-72
4. SLED CONTROL RELATED SIGNAL (NO DISC CONDITION)
SLED_S(2.0V/1.4V/1.0V)
SLED+(4.7V/4.0V/2.6V)
SLED-(5.3V/4.0V/3.0V)
FIG 4-1
5. LENS CONTROL RELATED SIGNAL(NO DISC CONDITION)
FOCUS_S(1.5V/1.4V/1.3V)
FACT+(4.0V/3.6V/3.2V)
FACT-(4.0V/3.6V/3.2V)
FIG 5-1
Page 65
3-73
6. LASER POWER CONTROL RELATED SIGNAL(NO DISC CONDITION)
MD_CD(0V/180mV)
MD_LD(5.0V//3.5V)
DVD_LD(5.0V/3.6V)
FIG 6-1
7. DISC TYPE JUDGEMENT WAVEFORM
F+
FE
RFL
FIG 7-1 (DVD)
Page 66
3-74
F+
FE
RFL
FIG 7-2 (DVD)
F+
FE
RFL
FIG 7-3 (CD)
Page 67
3-75
F+
FE
RFL
FIG 7-4 (CD)
8. FOCUS ON WAVEFORM
FOCUS_S
FACT+
FACT-
FIG 8-1 (DVD)
Page 68
3-76
FOCUS_S
FACT+
FACT-
FIG 8-2 (CD)
9. SPINDLE CONTROL WAVEFORM (NO DISC CONDITION)
SPINDLE_S
MOT_SPDL-(3.6V/2.4V)
MOT_SPDL+(3.6V/4.8V)
FIG 9-1
Page 69
3-77
10. TRACKING CONTROL RELATED SIGNAL(System checking)
TRACK_S
TACT-
TACT+
FIG 10-1(DVD)
TRACK_S
TACT-
TACT+
FIG 10-2(CD)
Page 70
3-78
11. ZR36868 AUDIO OPTICAL AND COAXIAL OUTPUT(SPDIF)
FIG 11-1
12. ZR36868 VIDEO OUTPUT WAVEFORM
1) 100%
FIG 12-1
Page 71
3-79
13. ZR36868 AUDIO OUTPUT TO AUDIO DAC
2) COMPOSITE VIDEO SIGNAL
FIG 12-2
FIG 13-1
Page 72
3-80
FIG 14-1
14. AUDIO OUTPUT FROM AUDIO DAC
Page 73
3-81
BLOCK DIAGRAMS
1. Overall Block Diagram
MIIC_DET
KARAOKE OPTION
IC602
SDRAM
M12L16161A
DV33
IC604
FLASH ROM
MX26LV800T
DV33
KARAOKE
MIC_IN
L
IC607
CS5331A
AIN
5V
MC
R
AMCL K
RAMDQM
RAMDAT[00:15]
IC605
ABCL K
KS24C021CS
ALRCLK
EEPROM
RFV33/DV33/1.8V
IC401
5V
PCM1753(2DAC)
MD
ALPCLK
ABCL K
L
R
AMCL K
AOUTO
IC601
L
R
OPTICAL
+12V
IC402
OP-AMP
NJM4580
AUDIO_MUTE
ZR36868
Y / C
ASPDIF COAX
27MHz
Pb(B)
Pr(R)
Y(G)
HIFI
IC801
LA72670BM
X-TAL
5V/REG12V
DSP/MPEG/RF
RAMADD[00:10]
RAMBA
PCLK
RSMCS0
RAMRAS#
RAMCAS-
RAMWE-
MEMDA[0:14]
MEMAD[00:18
] FLASHCS-
MEMRD-
MEMWR-
CN602
5V
HYPER_TERMINAL
DVD_ENA*
DVD_CLK
DVD_DATA*
IC501
M37760
VCR MICOM
VCR_DATA
DVD_RESET
DISC
5V
UP
PICK
SPINDLE
M
MOTOR
FACT+/-,TACTT +/-
MOT_SPDL +/-
SLED
MOTOR
(FEEDING)
MOTOR
LOADING
DECK MECHANISM
DVD_LD,CD_LD, VC
MD_CD
PICKSEL
HOMESW
CN601
DOWNLOAD
M
M
DVD:RF,A,B, C,D
CD:RF,A,B,C,D,E,F
SLED+,SLED--
LOAD+,LOAD-
ALPC
OUTSW , INSW
IC201
MOTOR
BA5888FP
DRVSB, OPEN, CLOSE
TRACK_S,FOCUS_S,SL ED_S SPINDLE_S
DRIVER
33V
M5V/5VT
5.3VA
5.0V
PWR_CTL_H
REG_9V
8V
3.3V
BOARD
POWER
50HZ/60Hz
AC 90V~240V
MOTOR_VCC
REG_12V
M5V
Page 74
3-82
2. SERVO Block Diagram
ROM
FLASH
EEPROM
CN601
DOWNLOAD
X601
27MHz
MEMAD[0:19]
FLASHCS-
MEMRD-
MEMDA[0:15]
MEMWR-
SCL, SDA
RXD, TXD
IC601
X-TAL
ZR36868
MPEG / DSP/RF
SPDL_SENS +/-
CLOSE,DRVSB
CD_MD, DVD_MD
FOCUS_S, TRACK_S,
SLED_S, SPINDLE_S,
OPEN
IC201
BA5888FP
Motor Driver
DVD_LD, CD_LD , VR_CD , VR_DVD
PICKSEL
IC203
BA4558
DVD: A,B,C,D, RF
CD: A,B,C,D, E, F,RF
DISC
MD_CD
HOMESW,INSW,OUTSW
FACT +/-, TACT +/-
MOT_SPDL +/-
SLED +/-
LOAD +/-
M D
Page 75
3-83
3. VIDEO & AUDIO Block Diagram
COAXIAL
Y
Y
OPTICAL
C
DVD_A_L
DVD_A_R
HI-FI
IC801
DVD_A_L
DVD_A_L
DVD_A_R
DVD_A_R
V.OUT
Pb
Pr
A_OUT_L
A_OUT_R
V.IN
A.OUT_L
A.OUT_R
A.IN_L
A.IN_L
A.IN_R
A.IN_R
OSD_VIDEO
IC402
OP-AMP
IC401
IC605
EEPROM
SCL
SCL
SDA
IC601
2DAC
SDA
AMCLK
ABCLK
MPEG
AUDIO_MUTE
AOUTO
ALRCK
Pr / R
ASPDIF
Y / G
Pb / B
IC501
MICOM
IC301
DVD_VIDEO
AVCP
Page 76
3-8 4 3-85
A B C D E F G H I J K L M N O P Q R ST
CIRCUIT DIAGRAMS
1. SYSTEM CIRCUIT DIAGRAM
Page 77
3-86 3-87
2. SERVO CIRCUIT DIAGRAM
A B C D E F G H I J K L M N O P Q R ST
Page 78
3-88 3-89
3. AV/JACK CIRCUIT DIAGRAM
A B C D E F G H I J K L M N O P Q R ST
Page 79
3-90 3-91
• IC BLOCK DIAGRAMS
IC201_BA5954
IC401_PCM1753
IC402_NJM4580D
IC203_LM358L
IC602_M12L16161A-7T
IC602_ZR36868ELC
IC604 IC606_74HCT244
IC605_KS24C021CS
Page 80
POSITION DRAWING OF DECK
MECHANISM PARTS
• Top View......................................................4-1
• Bottom View ...............................................4-1
DISASSEMBLY AND
ASSEMBLY OF DECK MECHANISM
01.Disassembly of Drum assembly ................4-2
02.Disassembly of Plate top disassembly..... 4-4
03.Holder Assembly CST ...............................4-4
04.Disassembly of Gear Assembly
Rack F/L ....................................................4-4
05.Opener Door .............................................4-4
06.Arm Assembly F/L .....................................4-4
07.Lever Assembly S/W .................................4-4
08.Motor Assembly L/D ..................................4-5
09.Gear Wheel ...............................................4-5
10.Arm Assembly Cleaner..............................4-5
11. Head F/E ...................................................4-5
12.Base Assembly A/C Head .........................4-5
13.Brake Assembly T .....................................4-6
14.Arm Assembly Tension..............................4-6
15.Reel S / Reel T..........................................4-6
16.Base Assembly P4 ....................................4-7
17.Opener Lid ................................................4-7
18.Arm Assembly Pinch .................................4-7
19.Arm T/up ...................................................4-7
20.Supporter, Capstan ...................................4-8
21.Belt Capstan/Motor Capstan .....................4-8
22.Lever F/R ..................................................4-8
23.Clutch Assembly D37 ................................4-8
24.Gear Drive/Gear Cam ...............................4-9
25.Gear Sector ...............................................4-9
26.Brake Assembly Capstan ..........................4-9
27.Plate Slider ................................................4-9
28.Lever Tension............................................4-9
29.Lever Spring ..............................................4-9
30. Lever Brake..............................................4-9
31.Gear Assembly P2/Gear Assembly P3 ...4-10
32.Base Assembly P2/Base Assembly P3 ...4-10
33.Base Loading ..........................................4-10
34.Base Tension ...........................................4-11
35.Arm Assembly Idler Jog ..........................4-11
DECK MECHANISM ADJUSTMENT
• Fixtures and tools for service ................4-12
1. Mechanism Assembly Mode Check ........4-13
2. Previous Preparation for
Deck Adjustment .....................................4-14
3. Torque Measuring ...................................4-14
4. Guide Roller Height Adjustment..............4-15
4-1. Prior Adjustment...............................4-15
4-2. Fine Adjustment ...............................4-15
5. Audio/Control (A/C) Head Adjustment......4-16
5-1. Prior Adjustment...............................4-16
5-2. Tape Path Check between Pinch
Roller and Take-up Guide ................4-17
5-3. Fine Adjustment
(Azimuth Adjustment).......................4-17
6. X-distance Adjustment ............................4-17
7. Adjustment after Drum Assembly
(Video Heads) .........................................4-18
8. Tachometer Adjustment of
Deck Assembly........................................4-18
8-1. Check of Audio, RF Normalization
Time (Locking Time) in Play after
CUE or REV.....................................4-18
8-2. Check of Tape Curl and
Jam Status .......................................4-18
PROTECTION, MAINTENANCE AND
CHECK OF VIDEO FUNCTION
1. Checking Points before Repair ...............4-19
2. Essential Check and Repair....................4-20
3. Regular Check and Repair......................4-20
4. Tools for Check and Repair.....................4-20
5. Maintenance Process..............................4-20
5-1. Removal of Foreign Materials..........4-20
5-2. Grease Application...........................4-21
TROUBLESHOOTING GUIDE
1. Deck Mechanism.....................................4-23
2. Front Loading Mechanism.......................4-26
EXPLODED VIEWS
1. Front Loading Mechanism Section...........4-28
2. Moving Mechanism Section(1) .................4-29
3. Moving Mechanism Section(2) .................4-30
SECTION 4 MECHANISM OF VCR PART(D-37)
CONTENTS
Page 81
POSITION DRAWING OF DECK MECHANISM PARTS
4-1
• Top View
• Bottom View
21
21
24
23
22
31
32
31
32
25
34
28
27
29
20
26
30
24
1 Drum Assembly 3 screws A-1 T
2 Plate Top 2 hooks A-2 T
2 3 Holder Assembly CST 6 chasses A-2 T
2,3 4 Gear Assembly Rack F/L 1 hook A-2 T
2,3,4 5 Opener Door Chassis Hole A-2 T
2,3,4,5 6 Arm Assembly F/L Chassis Hole A-2 T
7 Lever Assembly S/W Chassis Hole, A-2 T
1 hook
8 Motor Assembly L/D 1 screw A-3 T
9 Gear Wheel 2 hooks A-3 T
10 Arm Assembly Cleaner Chassis Embossing A-3 T
11 Head F/E Chassis Embossing A-3 T
12 Base Assembly A/C Head 1 screw A-3 T
2,3 13 Brake Assembly T 1 hook A-4 T
2,3 14 Arm Assembly Tension 1 hook A-4 T
2,3,13,14 15 Reel S / Reel T Shaft A-4 T
16 Base Assembly P4 Chassis Embossing A-5 T
17 Opener Lid Chassis Embossing A-5 T
17 18 Arm Assembly Pinch Shaft A-5 T
17 19 Arm T/up 1 hook A-5 T
20 Supporter, capstan Chassis Hole A-6 B
17,18 21 Belt Capstan/Motor Capstan 3 screws A-6 B
22 Lever F/R Locking Tab A-6 B
21, 22 23 Clutch Assembly D37 Washer A-6 B
24 Gear Drive/Gear Cam Washer/Hook A-7 B
25 Gear Sector Hook A-7 B
21 26 Brake Assembly Capstan Chassis Hole A-7 B
21,22,23, 27 Plate Slider Chassis Guide A-7 B
24,2526
21,22,23, 28 Lever Tension 1 Hook A7 B
24,2526,27
21,22,23, 29 Lever Spring 1 Hook A-7 B
24,2526,27
21,22,23, 30 Lever Brake 1 Hook A-7 B
24,2526,27
25 31 Gear Assembly P2/ Bass A-8 B
Gear Assembly P3
2, 3, 14, 32 Base Assembly P2 6 Chasses A-8 B
25, 31 /Base Assembly P3
25, 31 33 Base Loading 3 Hooks A-8 B
2,3,14 34 Base Tension Chassis Embossing A-9 T
35 Arm Assembly Idler Jog Locking Tab A-9 T
Parts firstly
Disassembled
Order Of Dis-
assembled
Part Fixing Type
Ref.
Draw-
ings
Posi
tion
NOTE : Assembly order is a reverse of
disassembly order.
(1) For assembly, check the assembly mode is accurate.
(2) Parts firstly disassembled indicate parts firstly disassem-
bled in disassembly of related parts.
T:Top, B:Bottom
9
2
6
11
1
33
14
15
4
3
5
10
8
12
18
16
17
19
7
35
13
15
Page 82
4-2
DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM
Cap, FPC
Drum Assembly
Cable Flat
(S1)
(S1)
(S1)
Holder FPC
H1
H2
1. Disassembly of Drum Assembly
(Figure A-1)
1) Separate cable flat from the Drum FPC and the Capstan
Motor.
2) Release 3 screws (S1) on the bottom side of the chassis,
and separate the drum assembly.
3) Release the hooks (H1, H2) and separate both the holder
FPC and the Cap FPC (disassemble if necessary).
Fig. A-1
Cautions in assembly of FPC
Holder FPC
Drum FPC
Cap FPC
Assembly shape seen in the reverse direction
Page 83
DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM
4-3
(B)
(E)
(C)
Plate Top
Arm Assembly F/L
Gear Assembly Rack F/L
Opener Door
Holder Assembly CST
(B')
(H3)
(A)
(B)
Lever Assembly S/W
(H4)
(E)
Fig. A-2
(Fig. A-2-1)
(Fig. A-2-2)
(Fig. A-2-5)
(Fig. A-2-6)
(Fig. A-2-3)
(Fig. A-2-4)
Page 84
2. Disassembly of Plate Top (Fig. A-2-1)
1) Separate the right part while leaning back the (B) part of
the plate top toward the arrow direction.
2) Separate the left part while leaning back the (B’) part of
the plate top toward the arrow direction.
(Tool used: Tool such as (-) driver, auger, etc with pointed or flat end)
CAUTIONS
Assemble while pressing the (C), (C’) part after corresponding them as in drawing.
3. Holder Assembly CST (Fig. A-2-2)
1) Firstly separate the left part from the groove on the (D)
part of chassis while moving the holder assembly CST
toward the arrow direction.
2) Separate the right part from each groove of chassis
CAUTIONS
Assemble by inserting the left part after firstly inserting the
(E) part of the holder assembly CST into the groove on the
(E’) part of chassis.
4. Disassembly of Gear Assembly
Rack F/L (Fig. A-2-3)
1) Separate the hook (H3) while leaning ahead the hook (3)
after moving the gear assembly rack F/L toward the arrow
(A) direction.
2) Separate the gear assembly rack F/L toward the arrow (B)
direction.
CAUTIONS
For the assembly, correspond the gear part of gear assembly rack F/L to the gear drive.
5. Opener Door (Fig. A-2-4)
1) Separate the opener door ahead from the guide hole of
chassis while turning it clockwise.
6. Arm Assembly F/L (Fig. A-2-5)
1) Firstly separate the left part of the arm assembly F/L from
the groove of chassis while pushing the arm assembly F/L
toward the arrow direction.
2) Separate the right part from the groove of chassis.).
7. Lever Assembly S/W (Fig. A-2-6)
1) Separate the lever assembly S/W while pushing it toward
the arrow direction after removing the hook (4) on the left
side of chassis.
4-4
DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM
(C')
(C)
(B')
(B)
Holder Assembly CST
(D)
Chassis
Gear Rack F/L
Gear Drive
Chassis
(H4)
Page 85
DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM
4-5
8. Motor Assembly L/D (Fig. A-3-1)
1) Take the connector (C1) connected to the Capstan motor
PCB out.
2) Remove a screw (S4) of the chassis (S4) and step backward, and disassemble it while holding it up.
9. Gear Wheel (Fig. A-3-2)
1) Release the hook (H5) of the gear wheel and disassemble
it upward.
10. Arm Assembly Cleaner (Fig. A-3-3)
1) Separate the (A) part of Fig. A-3-1 from the embossing of
chassis, and hold it up while turning it anti-clockwise.
11. Head F/E (Fig. A-3-4)
1) Separate the (A) part of the head F/E from the embossing of chassis, and hold it up while turning it anti-clockwise.
12. Base Assembly A/C Head (Fig. A-3-5)
1) Release a screw (S5) and disassemble while holding it up.
Fig. A-3
(Fig. A-3-3)
(Fig. A-3-5)
(Fig. A-3-4)
(Fig. A-3-2)
(Fig. A-3-1)
Arm Assembly Cleaner
(A)
(H5)
Gear Wheel
Base Assembly A/C Head
(A)
(S5)
Motor Assembly L/D
Head F/E
(C1)
(S4)
Page 86
4-6
DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM
Fig. A-4
13. Brake Assembly T (Fig. A-4-1)
1) Release the spring tension from the lever spring hook
(H6).
2) Disassemble the brake assembly T while holding it
upward.
14. Arm Assembly Tension (Fig. A-4-2)
1) Release the spring tension the hook (H7) from the arm
assembly tension.
2) After releasing the hook (H8) of the base tension, separate it while holding it up.
CAUTIONS
Spring used for both brake assembly T and arm assembly
tension is used (2EA used).
15. Reel S/Reel T (Fig. A-4-3)
1) Disassemble the reel S/ reel T while holding it up (comparison between Reel S and Reel T)
Reel S Reel T
(Fig. A-4-3)
(Fig. A-4-2)
(Fig. A-4-1)
(Fig. A-4-3)
Arm Assembly Tension
(H7)
Reel T
Reel S
Spring Tension
(H8)
Spring Tension
Brake Assembly T
(H6)
Page 87
DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM
4-7
Opener Lid
Arm Assembly Pinch
Base Assembly P4
Arm T/up
(A)
(B)
(C)
Chassis
(C)
(H9)
Fig. A-5
16. Base Assembly P4 (Fig. A-5-1)
1) Release the (A) part of the base assembly P4 from the
embossing of chassis.
2) Hold the base assembly P4 up while turning it anti-clockwise.
17. Opener Lid (Fig. A-5-2)
1) Release the (B) part of the opener lid from the embossing
of chassis.
2) Disassemble the opener lid upward while turning it anticlockwise.
18. Arm Assembly Pinch (Fig. A-5-3)
1) Hold the arm assembly pinch up.
19. Arm T/up (Fig. A-5-4)
1) Turn the arm T/up to release the anchor jaw (H9) part of
chassis and then hold it upward.
CAUTIONS
For the assembly, check the (C) part of the arm assembly
pinch is assembled as in drawing.
- REVERSE THE MECHANISM.
(Fig. A-5-2)
(Fig. A-5-1)
(Fig. A-5-3)
(Fig. A-5-4)
Page 88
4-8
DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM
Chassis
(S6)
Belt Capstan
Motor Capstan
Washer(W1)
Lever F/R
Clutch Assembly D37
(L1)
(L1)
Suppoter Capstan
Fig. A-6
20. Supporter, Capstan (Fig. A-6-1)
1) Turn the supporter and Capstan by 90 deg. clockwise
with a driver for disassembly.
21. Belt Capstan (Fig. A-6-2) /
Motor Capstan (Fig. A-6-3)
1) Separate the belt Capstan.
2) Undo 3 screws (S6) on the bottom side of chassis and disassemble it upward.
22. Lever F/R (Fig. A-6-4)
1) Release the locking tab (L1) and then disassemble it
upward.
23. Clutch Assembly D37 (Fig. A-6-5)
1) Remove the washer (W1) and then disassemble it
upward.
(Fig. A-6-1)
(Fig. A-6-2)
(Fig. A-6-3)
(Fig. A-6-4)
(Fig. A-6-5)
Page 89
DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM
4-9
Fig. A-7
24. Gear Drive (Fig. A-7-1)/
Gear Cam (Fig. A-7-2)
1) Remove the washer (W2) and then disassemble the
gear drive.
2) Release the hook (H10) of the gear cam and then disas-
semble it upward.
CAUTIONS
For the assembly, adjust both the gear driver hole (A) and
the gear cam hole (B) straightly and then correspond the
gear cam hole (C) to the chassis hole.
25. Gear Sector (Fig. A-7-3)
1) Release the hook (H11) of the gear sector and then hold
the gear sector upward.
26. Brake Assembly Capstan (Fig. A-7-4)
1) Release the locking tab (L2) on the bottom side of the
plate slider and then disassemble it upward.
27. Plate Slider (Fig. A-7-5)
1) Disassemble the plate slider while holding it up.
28. Lever Tension (Fig. A-7-6)
1) Release the lever tension from the guide (A) of chassis
while turning it anti-clockwise.
2) Disassemble the lever tension while holding it up.
29. Lever Spring (Fig. A-7-7)
1) Release the (B) part of the lever spring from the guide
(A) of chassis while turning it anti-clockwise.
2) Disassemble the lever tension while holding it up.
30. Lever Brake (Fig. A-7-8)
1) Disassemble the lever brake while holding it up.
(Fig. A-7-4)
(Fig. A-7-5)
(Fig. A-7-8)
(Fig. A-7-7)
(Fig. A-7-6)
(Fig. A-7-1)
(Fig. A-7-2)
(Fig. A-7-3)
Gear Cam Hole(B)
Gear Cam Hole(C)
Gear Drive Hole(A)
(H10)
(W2)
Gear Cam
Washer (W2)
Gear Drive
Lever Brack
(L2)
(H11)
Gear Sector
Brake Assembly Capstan
(B)
(A)
Plate Slider
Lever Tension
Lever spring
Base Loading
Chassis
Page 90
4-10
DECK MECHANISM DISASSEMBLY
Gear Assembly P3
Gear Assembly P2
Base Assembly P2
Base Assembly P3
(A)
(B)
(H14)
(H12)
(H13)
Chassis
Gear assembly P2 Hole
Gear assembly P3 Hole
Lever Tension Boss
Plate slider Hole(B)
Base Loading
Fig. A-8
31. Gear Assembly P2 (Fig. A-8-1)/
Gear Assembly P3 (Fig. A-8-2)
1) Hold the gear assembly P2 upward.
2) Hold the gear assembly P3 upward.
CAUTIONS
For the assembly, check the holes of both the gear assembly P2 and the P3 are adjusted straightly, and then correspond the gear section groove (A) to the plate slider hole (B).
32. Base Assembly P2 (Fig. A-8-3)/
Base Assembly P3 (Fig. A-8-4)
1) Disassemble the base assembly P2 downward while mov-
ing it toward the arrow (A) direction along with the guide
hole of chassis.
2) Disassemble the base assembly P2 downward while mov-
ing it toward the arrow (B) direction along with the guide
hole of chassis.
33. Base Loading (Fig. A-8-5)
1) Release 3 hooks (H12, 13, 14) of the base loading, and
then disassemble them upward.
- Reverse the mechanism.
(Fig. A-8-1)
(Fig. A-8-2)
(Fig. A-8-5)
(Fig. A-8-4)
(Fig. A-8-3)
Page 91
DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM
4-11
(A)
(B) (C)
Arm Assembly Idler Jog
Base Tension
Chassis
(D)
Fig. A-9
34. Base Tension (Fig. A-9-1)
1) Release the (A) part of the base tension from the
embossing of chassis.
2) Hold the base tension upward while turning it anti-clockwise.
35. Arm assembly Idler Jog (Fig. A-9-2)
1) Push both (B), (C) parts in Fig. A-9-2 toward the arrow
direction.
2) Disassemble the arm assembly idler upward.
CAUTIONS
Take care to ensure that the (D) part in the drawing is not
hung to chassis in disassembly.
(Fig. A-9-1)
(Fig. A-9-2)
Page 92
DECK MECHANISM ADJUSTMENT
4-12
• Fixtures and Tools for Service
1. Cassette Torque Meter
SRK-VHT-303(Not SVC part)
Part No:D00-D006
4. Torque gauge adaptor
Part No:D09-R001
5. Post height adjusting driver
Part No:DTL-0005
6. + Type driver (ø5)
2. Alignment tape
Part No NTSC:DTN-0001
PAL:DTN-0002
3. Torque gauge
600g.Cm ATG
Part No:D00-D002
SRK
VIDEO
CASSETTE
TORQUE
METER
VHT-303
S
R
K
-
V
H
T
-
S
S
R
K
-
V
H
T
-
T
300
250
200
150
50
0
300
250
200
150
50
0
100
Page 93
Purpose of adjustment : To make tools normally operate by positioning tools accurately.
DECK MECHANISM ADJUSTMENT
4-13
1) Turn the VCR on and take the tape out by pressing the
eject button.
2) Separate both top cover and plate top, and check both
the hole (A) of gear cam and the hole (A’) of chassis correspond (Fig. C-2).
3) If it is done as in the paragraph 2): Turn the gear cam as
in No.2) after mantling the motor assembly L/D.
4) Undo the screw fixing the deck and the main frame, and
separate the deck assembly. Check both the hole (A) of
gear cam and the hole (A’) of chassis correspond (Fig.
C-1).
5) Check the mode S/W on the main P.C. board locates at
a proper position as in (B) of the Fig. (C-1).
6) Connect the deck to the main P.C. board and perform all
types of test.
Gear Cam
Gear Drive
(C)
Mode S/W
(B)
Motor Assembly L/D
Gear Cam
Chassis Hole
Gear Cam Hole
(A)
(A')
Fixtures and tools used VCR (VCP) status Checking Position
• Blank Tape (empty tape)
• Eject Mode
(with cassette withdrawn)
• Mechanism and Mode Switch
Fig. C-1
Fig. C-2
CHECK DIAGRAM
BOTTOM VIEW
TOP VIEW
Correspondence of the gear cam hole (O)
and the gear drive hole (O)
1. Mechanism Assembly Mode Check
Page 94
Purpose of Measuring : To measure and check the reel torque on the take-up part and the
supply part that performs basic operation of the VCR (VCP) for
smoothly forwarding the tape.
Measure and check followings when the tape is not smoothly
wound or the tape velocity is abnormally proceeded:
4-14
• Torque Gauge
(600 g.cm ATG)
• Torque Gauge Adaptor
• Cassette Torque Meter
SRK-VHT-303
• Play (FF) or Review
(REW) Mode
• Try to operate the VCR (VCP) per mode with the
tape not inserted (See ‘2. Prior Preparation for
Deck Adjustment).
• Measure after adhering and fixing the torque
gauge adaptor to the torque gauge (Fig. C-3-1)
• Read scale of the supply or take-up part of the
cassette torque meter (Fig. C-3-2).
DECK MECHANISM ADJUSTMENT
1) Take the power cord from the consent.
2) Separate the top cover and the plate assembly top.
3) Insert the power cord into again.
4) Turn the VCR (VCP) on and load the cassette while pushing the lever stopper of the holder assembly CST backward. In this case, clog both holes on the housing
rail part of chassis to prevent detection of the end sensor.
If doing so, proceeding to the stop mode is done. In this
status, input signals of all modes can be received.
However, operation of the Rewind and the Review is
impossible since the take-up reel remains at stop status
and so cannot detect the reel pulse (however, possible for
several seconds).
2. Previous Preparation for Deck Adjustment
(Preparation to load the VCR (VCP) with cassette tape not inserted)
3. Torque Measuring
NOTE
Adhere the torque gauge adaptor to the torque gauge for measuring the value.
SRK
V
ID
E
O
C
A
S
S
E
T
T
E
T
O
R
Q
U
E
M
E
T
E
R
V
H
T
-3
0
3
S
R
K
-
V
H
T
-
S
S
R
K
-
V
H
T
T
3
0
0
2
5
0
2
0
0
1
5
0
5
0
0
3
0
0
2
5
0
2
0
0
1
5
0
5
0
0
1
0
0
Fig. C-3-2Fig. C-3-1
Torque Gauge
Torque Gauge
Adaptor
Reel Table
Item
Fast forward Torque
Rewind Torque
Play Take-Up Torque
Review Torque
Fast Forward
Rewind
Play
Review
Torque Gauge
Torque Gauge
VHT-303
VHT-303
Take-Up Reel
Supply Reel
Take-Up Reel
Supply Reel
More than 400g°cm
More than 400g°cm
40~100g°cm
120~210g°cm
Mode Instruments Reel Measured Measuring Value
• Cassette Torque Meter (SRK-VHT-303)• Torque Gauge (600g.cm ATG)
VCR (VCP) status Measuring methodFixtures and tools used
Page 95
Adjustment Procedure
1) Travel the tape and check the bottom surface of the
tape travels along with the guide line of the lower drum.
2) If the tape travels toward the lower part of guide line on
the lower drum, turn the guide roller height adjusting
screw to the left
3) If it travels to the upper part, turn it to the right.
4) Adjust the height of the guide roller to ensure that the
tape is guided on the guide line of the lower drum at the
inlet/outlet of the drum. (Fig. C-4-1)
DECK MECHANISM ADJUSTMENT
4-15
Fig. C-4-1
GUIDE ROLLER
HEIGHT
ADJUSTMENT SCREW
ADJUSTMENT DIAGRAM
Purpose of adjustment : To ensure that the bottom surface of the tape can travel along with
the tape lead line of the lower drum by constantly and adjusting
and maintaining the height of the tape.
4. Guide Roller Height Adjustment
Fixtures and tools used VCR (VCP) status Adjustment position
• Post Height Adjusting
Driver
• Play or Review Mode
• The guide roller height adjusting screw on the
supply guide roller and the take-up guide roller
4-1. Prior Adjustment
1) Play the standard test tape after connecting the probe of
oscilloscope to the RF envelope output point and the
head switching output point.
2) Tracking control (playback) : Locate it at the center
(Set the RF output to the maximum value via the tracking control when such adjustment is completed after the
drum assembly is replaced.)
3) Height adjusting screw: Flatten the RF waveform.
(Fig. C-4-2)
4) Move the tracking control (playback) to the right/left.
(Fig. C-4-3)
5) Check the start and the end of the RF output reduction
width are constant.
CAUTIONS
There must exist no crumpling and folding of the tape due
to excess adjustment or insufficient adjustment.
Fig. C-4-2
Fig. C-4-2
P2 POST ADJUSTMENT
P3 POST ADJUSTMENT
CH-1 CH-2
RF ENVELOPE OUTPUT POINT
HEAD RF SWITCHING OUTPUT POINT
Flatten the waveform by
lightly turning the
guide roller height adjustment screw.
When turning the tracking
control to both sides.
OSCILLOSCOPE
When the tracking control
locates at the center.
Waveform
Connection Diagram
Fixtures and tools used
Measuring tools and
connection position
VCR (VCP) status Adjustment position
• Oscilloscope
• Standard test tape
• Post height adjusting
driver
• CH-1: PB RF Envelope
• CH-2: NTSC : SW 30Hz
PAL : SW 25Hz
• Head switching output
point
• RF Envelope output
point
• Play the standard test
tape.
• Guide roller height
adjusting screw
4-2. Fine Adjustment
Page 96
4-16
DECK MECHANISM ADJUSTMENT
8.3
Fig. C-5-1
A/C Head Base
Fig. C-5-2
Height Adjustment
Screw(B)
Tilt Adjustment
Screw(C)
Azimuth
Adjustment
Screw(A)
X-Value Adjustment
Hole
Fig. C-5-3
A/C Head
Tape
Tape
0.2~0.25mm
P4
A/C Head Assembly
Purpose of adjustment : To ensure that audio and control signals can be recorded and
played according to the contract tract by constantly maintaining
distance between tape and head, and tape tension between the P3
post and the P4 post.
5. Audio/Control (A/C) Head Adjustment
Adjustment Procedure/Adjustment Diagrams
1) Basically use the A/C head assembly adjusted as in
SPEC.
2) Check there is crumpling and folding of the tape around
the A/C head. If it is, Turn and adjust the tilt adjusting
screw to ensure that the tape corresponds to the bottom
guide of the P4, and recheck the tape path after proceeding play for 4-5 seconds.
3) Where the tape bottom is not equal to Fig. C-5-3, Adjust
the height by using the height adjusting screw (B) and
then readjust it by using the tilt adjusting screw (C).
CAUTIONS
Always check the height of the A/C head since most ideal
height of A/C head can be obtained when the bottom part
of the tape is away 0.2 ~ 0.25mm from the bottom part of
the A/C head.
Fixtures and tools used VCR (VCP) status Adjustment position
• Blank Tape
(Empty Tape)
• Driver (+) Type ø 5
• Play the blank tape
(empty tape).
• Tilt adjusting screw (C)
• Height adjusting screw (B)
• Azimuth adjusting screw (A)
5-1. Prior Adjustment (performed only when no audio output appears in play of the standard test tape)
Fixed Screw
Page 97
Adjustment Procedure
1) After releasing the auto tracking, lightly turn the fixing
screw. Turn the (+) type driver (Ø 3 ~ Ø 4) on the X-distance adjusting hole to the right or left. Adjust the RF
envelope level to the maximum point and then fix the fixing screws.
2) For the 31mm head, adjust it with the SP tape recorded
in the width of 31mm since the head travels on the tape
track only for SP with the width of 58mm.
DECK MECHANISM ADJUSTMENT
4-17
5-2. Tape Path Check between Pinch Roller and
Take up Guide (Check in the Rev Mode)
1) Check the tape pass status between the pinch roller and
the take-up guide.(Check there is crumpling of the tape
pass and folding of the take-up guide.)
1) (1) When holding of the take-up guide bottom occurs
Turn the tilt adjusting screw (C) clockwise and travel it
stably to ensure there is no crumbling or folding of the
tape.
1) (2) When holding of the take-up guide top occurs
Turn the tilt adjusting screw (C) anti-clockwise and
travel it stably to ensure there is no crumbling or folding of the tape.
1) 2) Check there is folding of the tape at the bottom or top
of the take-up guide in cutting-off the REV mode
CAUTIONS
If the RF waveform is changed after adjusting the A/C head,
perform fine adjustment to ensure the RF waveform is flattened.
Adjustment Procedure
1) Connect the probe of Oscilloscope to the audio output
jack.
2) Ensure that Audio 1KHz, 7KHz output is flattened at the
maximization point by adjusting the Azimuth adjusting
screw (A).
Fig. C-5-4
Fixtures and tools used Connection position VCR (VCP) status Adjustment position
• Oscilloscope
• Standard test tape
(only for SP)
• Driver (+) Type Ø 4
• Audio Output Jack • Play the standard test
• Tape, 1KHz, 7KHz.
• Azimuth Adjusting
Screw (A)
• Height Adjusting Screw
(B)
5-3. Fine Adjustment (Azimuth Adjustment)
1KHz
A: Maximum
7KHz
B: Minimum
Fig. C-6
Fixtures and tools used Connection position VCR (VCP) status Adjustment position
• Oscilloscope
• Standard test tape
(only for SP)
• Driver (+) Type Ø 4
• CH-1: PB RF Envelope
• CH-2: NTSC ; SW 30Hz
PAL:SW 25Hz
• Head switching output
point
• RF Envelope output
point
• Play the standard test
tape.
6. X-distance Adjustment
Left
X-distance Adjusting Hole
Tilt Adjusting Screw (C)
Fixing Screw
Height Adjusting
Screw (B)
Right
Grove of Base A/C
Purpose of adjustment : To maintain compatibility with other VCR (VCP).
RF ENVELOPE OUTPUT POINT
HEAD RF SWITCHING OUTPUT POINT
OSCILLOSCOPE
Connection Diagram
CH-2CH-1
Azimuth
Adjustment
Screw(A)
Page 98
Checking/Adjustment Procedure
1) Play the blank tape (empty tape) and check whether the
guide roller crumbles or wrinkles the tape and adjust it if
necessary.
2) Check that the RF envelope output waveform is flat, and
adjust the height of the guide roller while playing the
standard test tape.
3) Adjust the switching point.
4) Check the RF envelope output is the maximum when
the tracking control locates at the center. If not maximum, set up to ensure that RF envelope output
becomes the maximum by turning the (+) type driver (Ø
3 ~ Ø 4) on the base A/C groove.
4-18
DECK MECHANISM ADJUSTMENT
8-2. Check of Tape Curl and Jam Status
Fixtures and tools used Connection position VCR (VCP) status Adjustment position
• Oscilloscope
• Standard test tape
(only for SP)
• Post Height Adjusting
Driver
• Driver (+) Type Ø 5
• CH-1: PB RF Envelope
• CH-2: NTSC : SW 30Hz
PAL:SW 25Hz
• Head switching output
point
• RF Envelope output
point
• Play the blank tape.
• Play the standard test
tape.
• Fine adjustment of
guide roller
• Switching Point
• Tracking Preset
• X-distance
7. Adjustment after Drum Assembly (Video Heads)
Purpose of adjustment : To adjust and stabilize the height change, X-distance change, etc
depending on the guide roller after assembling the drum.
RF ENVELOPE OUTPUT POINT
V2V1V1
V1/V MAX = 0.7
V1/V MAX = 0.8
RF ENVELOPE OUTPUT
HEAD RF SWITCHING OUTPUT POINT
OSCILLOSCOPE
Connection Diagram
Waveform
CH-2CH-1
Checking Procedure
1) Check that locking time of the RF and Audio waveform is
fallen within the measuring standard in conversion of the
play mode from the CUE or the REV mode.
2) Readjust the paragraph 5 and 6 if it deviates from the
standard.
Fixtures and tools used Measuring standard Connection position VCR (VCP) status
• Oscilloscope
• 6H 3KHz Color Bar
Standard Test tape
• Stop Watch
• RF Locking Time: Within
5 seconds
• Audio Locking Time :
Within 10 seconds
• CH-1: PB RF Envelope
• CH-2: Audio output
• RF Envelope output
point
• Audio output jack
• Play the 6H 3KHz
Color Bar Standard
Test tape.
8. Check of Traveling Device after Deck Assembly
8-1. Audio, RF Normalization Time (Locking Time) Check in Play after CUE or REV
Checking Procedure
1) Check there is no abnormality of every traveling post
status.
2) There must be no abnormal operation of the counter in
occurrence of folding of the bottom tape. There must be
not abnormality of audio signal in damage of the top tape.
3) If there is abnormality, readjust the adjustment paragraph 4 and 5.
Fixtures and tools used Fixtures and tools used Fixtures and tools used
• T-160 Tape
• T-120 Tape
• There must be no jam or curl at the
first, middle and end position of tape.
• Travel the tape at the position
of its first and end.
Page 99
PROTECTION, MAINTENANCE AND CHECK OF VIDEO FUNCTION
4-19
(3) F/E Head
(5) Drum Assembly
(Video Head)
(4) Base Assembly P2
(2) Tension Post
(1) Supply Reel
(6) Base Assembly
P3
Phenomena
Replace-
ment
Checking Points and
Cause
Color beat Pollution of Full-Erase Head o
S/N, Color Faded Pollution of Video Head o
Horizontal, Vertical Jitte o
CAUTIONS
If operation of the position with (O) mark is abnormal even
after removing cause, replace it with substitute product since
it shows damage or wearing.
(7) A/C Head
(8) P4 Post
(10) Pinch Roller
(11) Take-up Guide
Post
(9) Capstan Shaft
(12) Take-up Reel
* No. (1) ~ (12) shows sequence that the tape moves from the supply reel to the take-up reel.)
Fig. C-9-1 TOP VIEW
Fig. C-9-2 BOTTOM VIEW
F/E Head
Video Head
A/C Head
Pinch Roller
Belt Capston
Clutch
Assembly A37
Fig. C-9-3 Tape Transport System
Pollution of Video Head or
Tape Transport System
Poor Sound, Low Sound o
Pollution of Audio/Control
Head
o
Pollution of Pinch Roller or
Belt Capstan Belt
No tape wound or tape
wound loosely.
FF or REW impossible,
or slow turning
Deterioration of Clutch
Assembly D37 Torque
Pollution of Drum and
Traveling Device
Tape loosely wound in
REV or Unloading
o
Fig. C-9-3
1. Checking Points prior to Repair
Following abnormal phenomena may be repaired by
removal of foreign materials and oil supply. Check oiling is
required at the checking set or cleaning status is complete.
Determine that necessity of checking and repair the set
exists after checking the using period of the set together
with the user. In this case, followings must be checked:
Page 100
PROTECTION, MAINTENANCE AND CHECK OF VIDEO FUNCTION
4-20
2. Essential Check and Repair
Recording density of the video is far higher than the audio.
Therefore video parts are very precise so as to allow only
error of 1/1000mm or so in order to maintain compatibility
with other videos.
If one of these parts is polluted or old, same phenomena will
appear as they are damaged.
To maintain clear screen, regular check, replacement of old
and damaged parts and oil supply, etc are essential.
3. Regular Check and Repair
Check and repair schedule is not constant since they vary
depending on method that the consumer uses video and
environment where the video is installed at.
However, for the video used by common household, good
screen will be maintained if regular check and repair per
1,000 hour is performed. The following chart shows relationship between using time and checking time:
4. Tools for Check and Repair
(1) Grease: Floil G-3114 (KANTO) or equivalent grease
(Green)
(2) Grease: Kanto G-754, PL-433 (Yellow)
(3) Alcohol (Isopropyl Alcohol)
(4) Cleaning Patch (cloth)
5. Maintenance Process
5-1) Removal of Foreign Material
(1) Removal of foreign material from video head (Fig. C-9-4)
Firstly try to use a cleaning tape.
(1) Use a cleaning patch if foreign materials are not removed
with the cleaning tape due to severe dirty of the head.
Soak the cleaning patch in alcohol and put it to the head
tip. Smoothly turn the drum (turning cylinder) to the right
or left (In this case, the cleaning patch must not be
moved vertically).
(1) After completely drying the head, test the traveling status
of the tape.
(1) If alcohol (Isopropyl Alcohol) remains at the video head,
the tape may be damaged when this solution touches
with the head surface.
Never use a cloth bar (commercial sale)
(2) Wipe the tape transport system and the drive system
with the cleaning patch soaked in alcohol (Isopropyl
Alcohol) when removing foreign materials from them.
1) The part touched with the traveling tape is called as
tape transport system. The drive system consists of
parts to travel the tape.
(2) 2) Care must be exercised so that unreasonable force
to change the pattern will be applied to the tape transport system during removal of foreign materials.
About
1 year
One hour
Table 1
Two hours
Three hours
Time
Requiring
Checking
Average
hours used
per day
About
18 months
About
3 years
Fig. C-9-4
Drum
(Turning Cylinder)
Head Tip
Soak alcohol
(Isopropyl Alcohol).
Cleaning Patch
(Cloth)
Smoothly turn the drum (turning
cylinder) touching the soft surface
to the head tip surface.
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