Page 1
MODEL : XBV613SERVICE MANUAL
SERVICE MANUAL
Product Type: VCR+DVD COMBI
Chassis: D37 + DP-10C
Manual Series: XBV613
Manual Part #: 3829RGN005G
Model Line: D
Product Year: 2006
Model Series:
XBV613
Printed in U.S.A
CONTENTS
SUMMARY
CABINET & MAIN CHASSIS
ELECTRICAL
MECHANISM OF VCR PART
REPLACEMENT PARTS LIST
Huntsville, Alabama 35824-1513
Copyright © 2006 by Zenith Electronics Corporation
................................................
....................
............................................
...................
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Published March 2006
by Technical Publications
Zenith Electronics Corporation
201 James Record Road
1
2
3
4
5
Page 2
CONTENTS
SECTION 1 . . . . SUMMARY
SECTION 2 . . . . CABINET & MAIN CHASSIS
SECTION 3 . . . . ELECTRICAL
SECTION 4 . . . . MECHANISM OF VCR PART
SECTION 5 . . . . 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........................................................................... 1-5
SPECIFICATIONS....................................................................................................................... 1-6
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 NOTONLY
VOID THE WARRANTY, BUTMAYLEAD TO YOUR BEING LIABLE FOR ANY
RESULTING PROPERTYDAMAGE 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 THATALL COMPONENTS ARE POSITIONED IN SUCH AWAY
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 ALLLOOSE 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 METALSURFACES 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 MAG-
NITUDE TO CONSTITUTE ARISK 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
ATYOUR 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 AFACTOR, 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 AGAINSTTHE 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 ROLLA 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 THATA FOREST OF EXTENSIONS SPROUTING FROM ASINGLE 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
METALPART
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
1-5
SERVICE INFORMATION FOR EEPROM
POWER ON
DVD LOGO Status (NO Disk status)
Remotecontrol
Pause key-->1-->4-->7-->2 in order.
Press number 0~9, Press charater
A~F (1~6 for a while)
Use arrow key (
F D G E
) to move
to approprite position and make
changes
Press pause key once
Change will be applied when power
OFF-->ON.
* OPTION
• NTSC model doesn’t have VCR option and use DVD option B~F as VCR option. (only DVD exist)
• PAL model has another separate VCR option. (Both VCR and DVD exist)
MODEL XBV613
NAME HEX
OPT 1 55
OPT 2 53
OPT 3 00
OPT 4 45
OPT 5 12
OPT 6 05
OPT 7 E4
OPT 8 00
OPT 9 00
OPT A 00
OPT B C0
OPT C 40
OPT D A0
OPT E 01
OPT F 03
OPT G 3D
DETECT NEW EEPROM
(OPTION EDIT SCREEN)
Page 7
1-6
SPECIFICATIONS
• GENERAL
Power requirements 120V, 60Hz
Power consumption 16 W
Dimensions (approx.) 430 x 78.5 x 265 mm (W x H x D)
Mass (approx.) 4.2 kg
Operating temperature 5˚C to 40˚C (41˚F to 104˚F)
Operating humidity 5 % to 90 %
Signal system NTSC
• INPUTS
ANTENNA IN 75 ohms (VHF/UHF/CATV)
VHS VIDEO IN(LINE1, 2) 1 V (p-p) 75 ohms, sync negative, RCA jack x 2
VHS AUDIO IN(LINE1, 2) -6.0 dBm more than 47 ohms, RCAjack (L, R) x 2
•OUTPUTS
VIDEO OUT 1 V (p-p) 75 ohms, sync negative
S-VIDEO OUT (Y) 1.0 V (p-p), 75 ohms, negative sync, Mini DIN 4-pin x 1
(C) 0.286 V (p-p) 75 ohms
COMPONENT VIDEO OUT (Y) 1.0 V (p-p), 75 ohms, negative sync, RCA jack x 1
(PROGRESSIVE SCAN) (Pb)/(Pr) 0.7 V (p-p), 75 ohms, RCA jack x 2
Audio output (digital audio) 0.5 V (p-p), 75 ohms, RCA jack x 1
Audio output (analog audio) 2.0 Vrms (1 KHz, 0 dB), 600 ohms, RCA jack (L, R) x 1
RF OUT Channel 3 or 4 (Adjustable)
• VCR SPECIFICATIONS
Head system Four head helical scan azimuth system
Timer 12-hour display type with AM, PM
Tape speed SP: 33.35 mm/sec, LP: 16.67 mm/sec, SLP: 11.12 mm/sec
Tape width 12.7 mm
Maximum recording time SP: 2 HOURS (T-120), SLP: 6 HOURS (T-120)/
8 HOURS (T-160)
Rewind time About 3 minutes (T-120)
Channel coverage VHF: 2-13, UHF: 14-69,
CATV: 1-125 (4A, A-W, W+1 - W+84, A-5 - A-1)
Frequency range 20 Hz to 20 kHz
Signal-to-noise ratio More than 43 dB
Dynamic range More than 88 dB
Channel separation More than 60 dB
• DVD SPECIFICATIONS
Laser system Semiconductor laser, wavelength 650 nm
Frequency response DVD (PCM 96 kHz): 8 Hz to 44 kHz,
DVD (PCM 48 kHz): 8 Hz to 22 kHz
CD: 8 Hz to 20 kHz
Signal-to-noise ratio More than 100 dB (ANALOG OUT jacks only)
Harmonic distortion Less than 0.008%
Dynamic range More than 95 dB (DVD/CD)
*Design and specifications are subject to change without notice.
Page 8
2-1
SECTION 2
CABINET & MAIN CHASSIS
CONTENTS
EXPLODED VIEWS.....................................................................................................................2-2
1. Cabinet and Main Frame Section...........................................................................................2-2
2. DECK MECHANISM SECTION [ DVD MD (DP-10C) ]............................................................2-3
3. Packing Accessory Section ....................................................................................................2-4
Page 9
2-2
EXPLODED VIEWS
1. CABINET AND MAIN FRAME SECATION
A
5
4
3
2
1
BCD
463
463
NOTES) THE EXCLAMATION POINT WITHIN AN
EQUILATERAL TRIANGLE IS INTENDED
TO ALERT THE SERVICE PERSONNEL
TO THE PRESENCE OF IMPORTANT
SAFETY INFORMATION IN SERVICE
LITERATURE.
A46
470
457
250
300
463
463
272
273
471
469
A26
A47
271
A00
469
324
288
465
A50
469
322
323
274
CN501
463
330
261
452
261
283
286
285
284
A44
260
261
452
452
280
A43
Page 10
2-3
2. DECK MECHANISM SECTION [ DVD MD (DP-10C) ]
A26
012
A02
017
013
015
019
439
435
018
015B
015A
014
440
001
A01
002
003
020
016
012A
432
026
A03
012
036
030
024
025
439
010
431
435
012A
021
430
Page 11
2-4
3. PACKING ACCESSORY SECTION
810
CABLE ASS'Y RF
808
BATTERY
REMOTE CONTROLLER
900
ASSEMBLY
803
PACKING, CASING
806
811
PLUG ASS'Y 1WAY
812
PLUG ASS'Y 2WAY
INSTRUCTION ASSEMBLY
801
PACKING, CASING
803
RF CABLE
BAG
804
802
BOX
Page 12
3-13-1
SECTION 3
ELECTRICAL
CONTENTS
VCR PART
ELECTRICAL ADJUSTMENT
PROCEDURES
.......................................................3-2
ELECTRICAL
TROUBLESHOOTING GUIDE..........................3-3
1. POWER(SMPS) CIRCUIT..................................3-3
2. SYSTEM/KEY CIRCUIT.....................................3-6
3. SERVO CIRCUIT ...............................................3-7
4. OSD CIRCUIT....................................................3-9
5. Y/C CIRCUIT....................................................3-10
6. HI-FI CIRCUIT..................................................3-14
7. TUNER/IF CIRCUIT .........................................3-17
BLOCK DIAGRAMS..........................................3-19
1. POWER(SMPS) BLOCK DIAGRAM...............3-19
2. TU/IF BLOCK DIAGRAM ................................3-21
3. Y/C BLOCK DIAGRAM ...................................3-23
4. NORMAL AUDIO BLOCK DIAGRAM.............3-25
5. HI-FI BLOCK DIAGRAM .................................3-27
6. SYSTEM BLOCK DIAGRAM...........................3-29
CIRCUIT DIAGRAMS........................................3-31
1. POWER(SMPS) CIRCUIT DIAGRAM .............3-31
2. TU/IF CIRCUIT DIAGRAM...............................3-33
3. A/V CIRCUIT DIAGRAM..................................3-35
4. HI-FI CIRCUIT DIAGRAM................................3-37
5. JACK CIRCUIT DIAGRAM ..............................3-39
6. SYSTEM CIRCUIT DIAGRAM .........................3-41
• WAVEFORMS....................................................3-43
• CIRCUIT VOLTAGE CHART.............................3-45
PRINTED CIRCUIT DIAGRAMS ....................3-49
1. MAIN P.C.BOARD (TOP SIDE) .......................3-49
2. MAIN P.C.BOARD (BOTTOM SIDE) ..............3-51
3. POWER P.C.BOARD ......................................3-53
4. KEY P.C.BOARD .............................................3-55
DVD PART
ELECTRICAL
TROUBLESHOOTING GUIDE
........................3-57
1. POWER CHECK FLOW ..................................3-57
2. SYSTEM OPERATION FLOW.........................3-58
3. TEST & DEBUG FLOW...................................3-59
DETAILS AND WAVEFORMS ON SYSTEM
TEST AND DEBUGGING
.......................................3-65
1. SYSTEM 27MHZ CLOCK, RESET SIGNAL...3-65
2. SDRAM CLOCK ..............................................3-66
3. TRAY OPEN/CLOSE SIGNAL.........................3-66
4. SLED CONTROL RELATED SIGNAL
(NO DISC CONDITION)...................................3-68
5. LENS CONTROL RELATED SIGNAL
(NO DISC CONDITION)...................................3-68
6. LASER POWER CONTROL RELATED
SIGNAL(NO DISC CONDITION) .....................3-69
7. DISC TYPE JUDGEMENT WAVEFORM .........3-69
8. FOCUS ON WAVEFORM ................................3-71
9. SPINDLE CONTROL WAVEFORM
(NO DISC CONDITION)...................................3-72
10. TRACKING CONTROL RELATED
SIGNAL(SYSTEM CHECKING).....................3-73
11. RF WAVEFORM .............................................3-74
12. ZR36882 AUDIO OPTICAL AND COAXIAL
OUTPUT(SPDIF)............................................3-74
13. ZR36882 VIDEO OUTPUT WAVEFORM.......3-75
14. AUDIO OUTPUT FROM AUDIO DAC...........3-76
BLOCK DIAGRAMS...........................................3-78
1. SYSTEM BLOCK DIAGRAM...........................3-78
2. SERVO BLOCK DIAGRAM .............................3-79
3. AUDIO & VIDEO IN/OUT
BLOCK DIAGRAM...........................................3-80
CIRCUIT DIAGRAMS.........................................3-81
1. SYSTEM CIRCUIT DIAGRAM .........................3-81
2. SERVO CIRCUIT DIAGRAM...........................3-83
3. AV/JACK CIRCUIT DIAGRAM ........................3-85
Page 13
3-2
ELECTRICAL ADJUSTMENT PROCEDURES
1. Servo Adjustment
1) PG Adjustment
• Test Equipment
• Adjustment And Specification
a) OSCILLOSCOPE b) NTSC MODEL: NTSC 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=63µ s).
• PG Adjustment Method
a-1) Payback the SP standard tape
b-2) Press the “OK(ENTER)” key on the Remote controller and the “REC” key on the Front Panel the same
time, then it goes in to Tracking initial mode.
c-3) Repeat the above step(No.b-2), then PG adjusts automatically.
d-4) Stop the playback, PG adjustment is finished.
• 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.outH/SW
R/C KEY
(TP)
H/SW
Composite
VIDEO
6.5H(412µs)
VCR PART
Page 14
3-3
ELECTRICAL TROUBLESHOOTING GUIDE
NO
Check or Replace
D102
Replace D123
Replace D124
Replace D121
YES
YES
Is D121 Normal?
Power Line of Main
PCB is short
1. Power(SMPS) CIRCUIT
No 5.3VA
Replace FR101
(Use the same ICW)
Is the FR101
Normal?
Is R101 Normal?
Is BD101 Normal?
NO
NO
NO
NO
NO
NO
NO
NO
NO
Replace BD101
Replace R101
Is D102 normal?
Replace D125
Replace IC103
YES
YES
YES
YES
YES
YES
YES
Is Vcc (9V - 18V) supplied to IC101 Pin2?
Are D125 normal?
Is there about 2.5V
at IC103 Pin1?
Is D123 normal?
Is D124 Normal?
(1) No 5.3VA
Page 15
3-4
No 33V
Is the Vcc(33V) supplied to Q161 Emittor?
Check or Replace
D121
Is Q162 Base
‘H’?
Check the PWR CTL
“H” signal from µ-com
Check or Replace
Q161
YES
YES
YES
(5) No 33V
No 5.0V_D
Check or Replace
D125
Is the Vcc(5.3V) supplied to Q165 Emittor?
Check or Replace
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
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
Q163
NO
NO
YES
YES
YES
(3) No 5.0V_T
No 3.3V
Check or Replace
D123
Is there about 3.8V
at IC131 pin1?
Is there about 3.3V~5V
at IC131 pin4?
NO NO
Check the PWR CTL
“H” signal from µ-com
NO NO
YES
YES
Check IC131
and Replace
YES
(4) No 3.3V
Page 16
3-5
No Motor_Vcc
Check or Replace
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?
Check or Replace
Q165
YES
YES
(7) No REG 12V
Check or Replace
D124
NO
NO
Check the PWR CTL
“H” signal from µ-com
No REG 9V
Is the Vcc(12V) supplied
to Q164 Collector?
Check or Replace
D124
Is the Vcc(10V) supplied to Q164 Base?
Check or Replace
ZD152
Check or Replace
Q164
YES
YES
YES
(9) No REG 9V
No 9V
Check or Replace
D126
Is there about 3.8V
at IC141 pin1?
Is there about 3.3V~
5V at IC131 pin4?
NO NO
Check the PWR CTL
“H” signal from µ-com
NO NO
YES
YES
Check or Replace
IC141
YES
(8) No 9V
Page 17
3-6
2. SYSTEM/KEY CIRCUIT
(1) AUTO STOP
(2) The unstable loading of a Cassette tape
Auto Stop
Does the SW30 waveform
appear at IC501 Pin18?
Do the T-UP Reel Pulses
appear at IC501 Pin80?
Is 12V applied to PMC01
Pin1?
Check the Drum Motor
signal.
Does 5V appear at RS501?
Check the Q165 Power
Circuit.
Refer to “SMPS MOTOR_Vcc
12 Volt Trouble Shooting”.
Is 5V applied to R531 ?
Refer to SMPS 5.3VA
troubleshooting.
Check IC501 Pins22, 23,
24, 25.
Do T/UP Reel Pulses
appear at the point
between R556 and R536?
Replace the T/UP Reel
Sensor (RS501).
Check the CST SW and
the peripheral circuitry.
Replace IC501.
The unstable loading of a
Cassette tape
Does the “H” signal appear
at IC501 Pin60 during
inserting of the CST ?
Does the “L” signal appear
at IC501 Pin19 during
inserting of 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 18
3-7
3. SERVO CIRCUIT
(1) Unstable Video in PB MODE
Unstable Video in
PB Mode.
Does the Noise level of the
screen change
periodically?
Do the CTL pulses appear
at IC501 Pin97?
Is adjusting the height of
the CTL Head accurate?
Readjust the height of the
CTL Head.
Replace IC501.
Refer to “When the Y signal
doesn’t appear on the
screen in PB Mode”.
Does the CFG waveform
appear at IC501 Pin87?
On tracking do the CTL
pulses move?
Does the Video Envelope
waveform appear at IC501
Pin9?
Replace IC501.
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
(2) When the Drum Motor
(2) doesn’t run.
Do the DFG Pulses appear
at PMC01 Pin11?
Replace the DRUM-M or
CAP-M.
Are the foil patterns and
the Components between
IC501 Pin 90 and PMC01
Pin11 shorted?
Replace IC501.
Refer to “(2)
No 12VA of Power section”
Do the Drum PWM Pulses
appear at the IC501
Pin76?
Are the foil patterns and
the Components between
IC501 Pin76 and PMC01
Pin12 shorted?
Do the DFG Pulses appear
at IC501 Pin90?
Do the Drum PWM Pulses
appear at IC501 Pin76?
Are the connecting patterns and the Components
between IC501 Pin76 and PMC01 Pin12 shorted?
When the Drum Motor
doesn’t run,
Does 12V appear at
PMC01 Pin8?
Does 2.8V appear at
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 19
3-8
Does the CFG signal appear at
PMC01 Pin1?
Does the PWM signal appear at IC501
Pin77?
Does 2.8V appear at PMC01 Pin 9?
Check the PMC01 and the Capstan
Motor Ass’y.
Does the Capstan PWM signal appear at
IC501 Pin77?
Are the foil patterns and Components
between IC501 Pin77 and PMC01 Pin9
shorted?
Does the CFG signal come into IC501
Pin87?
Are the foil patterns and Components
between IC501 Pin77 and PMC01 Pin9
shorted?
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 PMC01?
YES
Replace IC501.
YES
NO
NO
YES
Refer to “SMPS(CAPSTAN/12Volt)
Trouble Shooting”.
Are the foil patterns and component
between IC501 Pin87 and PMC01 Pin1
shorted?
Check the Capstan Motor Ass’y.
NO
Page 20
3-9
KEY doesn’t working.
Is 5V applied to IC501
Pin99?
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
4. OSD CIRCUIT
(1) No OSD display.
(2) I
2
C BUS CHECK
No OSD or F.OSD display.
Is 5.3V applied to
IC501 Pin53?
Does oscillation occur at
IC501 Pins44, 45?
Replace IC501.
The I2C waves don’t
come out.
Does Power appear at the
Pull up impedence
(R569, R507)?
Replace IC501.
Refer to “SMPS 5.3VA
Trouble Shooting”.
Check or Replace the pheripheral Circurity.(L511,
R518, C596, C595)
Refer to “SMPS 5.3VA
Trouble Shooting”.
YES
YES
YES
NO
NO
NO
Page 21
3-10
5. Y/C CIRCUIT
(1) No Video in EE Mode,
No Video in EE Mode
Does the Video signal
appear at IC302 Pins1,
3?
Is there SW5V at
IC302 Pin6?
Replace IC302.
Does the Video signal
appear at IC301 Pins28,
30, 32?
Is REG 5.0V applied to
IC301Pins23, 44, 45, 52,
68, 77?
Does the Video signal
appear at IC301 Pin26?
Does the Video signal
appear at IC501 Pin52?
Does the Video signal
appear at the Q924
Emitter?
Check the SW 5V Line.
(Power Circuit)
Is I2C BUS signal applied to
IC301 Pins53, 54, 55?
Replace IC301.
Check the path of the signal between the IC301 Pin
26 and IC501 Pins50, 52.
Is there 12V on the
terminal of R905?
Check the SW 12V Line.
(Power Circuit)
Replace Q924.
Check the System Circuit.
(Refer to ‘SYSTEM I2C BUS
CHECK Trouble Shooting’)
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
YES
YES
Check DVD Video Input
(IC601, Pin150), Tuner
Video Input (TU701 Pin16),
Line Video Input (JK901),
respectively.
NO
Page 22
3-11
3. Y/C CIRCUIT
(2) When the Y(Luminance) signal doesn’t appear on the screen in PB Mode,
Is 5V applied to IC301
Pins23, 44, 45, 52, 68, 77?
Is the Y/C Bus siganl
applied to IC301 Pins53,
54, 55?
Does the normal RF signal
appear at IC301 Pin14?
Check the line of the SW
5V Line.
Check the System Circuit.
(IC501 Pin18)
Check the V.H.S/W level.
Refer to ‘SYSTEM Y/C
BUS CHECK Trouble
Shooting’.
Is the V.H.S/W signal
applied to IC301 Pin57?
Does the Rectangular
waveform(5V) appear at
IC301 Pin57(V.H.S/W)
Clean the Drum.
Check C324.
Check R328, C322, C323.
Does the Y(Luminance)
signal appear at IC301
Pin20?
Is the Y(Luminance) Video
waveform shown at IC301
Pin22?
Replace IC301.
NO
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
Page 23
3-12
3. Y/C CIRCUIT
(3) When the C(Color) signal doesn’t appear on the screen in PB Mode,
Is SW 5V applied to IC301
Pins23, 44, 45, 52, 68, 77?
Does the Color signal
appear at IC301 Pins41,
50?
Check the line of the REG
5V Line. (Power Circuit)
Replace X301.
Check C342, C341, R333.
Is the oscillation frequency
of X301 (3.58MHZ) normal?
Replace IC301.
Does the Color signal
appear at IC301 Pin48?
Replace IC301.
NO
YES
YES
YES
NO
NO
NO
Page 24
3-13
3. Y/C CIRCUIT
(4) When the Video signal doesn’t appear on the screen in REC Mode,
YES
YES
YES
YES
YES
YES
NO
NO
YES
YES
YES
YES
YES
Check system part
(V.H/SW)
Replace IC301.
Check the drum
*OPTION
Pins72, 73, 74(SP)
Pins65, 66, 67(EP)
REC mode
Check the EE mode
NO
Is EE mode normal?
Is color
normal?
A
A
YES YES
Is brightness normal?
Does signal appear at
IC301 Pins41, 50?
NO
Check X301 oscillation
frequency.
YES
Is the brightness signal supplied to IC301 Pins18?
Is SW 5V supplied to IC301
Pins23, 44, 45, 68, 77?
Check the power of Pins23,
44, 45, 52, 68, 77.
Check the SW 5V power.
NO
NO
NO
NO
NO
Is Y/C Bus applied to
IC301 Pins53, 54, 55?
Check the SW 5V power Check system part
Do X301 and X-TAL
oscillate?
Check X301.
Is V.H SW supplied to
IC301 Pin57?
Does the FM signal appear
at IC301 Pins73(SP)/
66(EP)?
Page 25
3-14
6. Hi-Fi CIRCUIT
(1) No Sound(EE Mode)
YES
No Sound.
Check the SIF.IN of IC801 Pins57.
Check the DVD Audio of IC801
Pins12, 74.
Check the LINE1 Audio of IC801
Pins11, 73.
Check the LINE2 Audio of IC801
Pins9, 71.
Check the Vcc of IC801 Pins3, 5, 15,
32, 36, 46, 54.
YES
Check the IIC Clock and DATA at
IC801 Pins37, 38.
YES
Check the Audio of IC801 Pins78, 80.
YES
Check the Audio of C804, C854.
YES
Check JK901.
Check the TU701 SIF Pin13.
NO
Check the DVD MODULE.
(PMD02 Pins13, 15).
NO
Check the Rear Jack.
(JK901 Audio in).
NO
Check the front Jack.
Timer
NO
Check the Power 5V, 5.3VA, REG 9V.
CN701 2,3,11,12
YES
NO
Check IC501 Pins71, 72.
NO
Replace IC801.
Replace C804, C854.
NO
NO
Page 26
3-15
3. Y/C CIRCUIT
(2) Hi-Fi Playback
YES
YES
YES
YES
PB mode
No Sound.
Check the Vcc of IC801
(Pins3, 5, 15, 32, 36, 46, 54).
Check the Hi-Fi Selection switch.
(IC801 Pin39) and the Tape quality.
Is the RF Envelope at
IC801 Pin23 over 3Vp-p?
YES
Check IC801 Pin37(Data),
Pin38(Clock)
YES
Do Audio Signals appear at
IC801 Pin80(L-CH), 78(R-CH)?
YES
Do Audio Signals appear at
JK901?
Check Power.
NO
Check IC501 Pin19
(A.H/SW)
NO
NO
Check the parts of µ-COM
(IC501 Pins71, 72)
NO
Check the Connection at
P3D01 Pins7, 9.
NO
Check the Jack(JK901)
NO
Check C801, C851, R801,
R851.
YES
Page 27
3-16
(3) Hi-Fi REC
Hi-Fi REC.
It is impossible to record Hi-Fi Audio
signal.
Check Vcc of IC801.
(Pins3, 5, 15, 32, 36, 46, 54)
YES
YES
Check IC801 Pin37(Data), Pin38(CLOCK).
YES
Do Audio signals appear at IC801 Pin6?
YES
Do Audio signals appear at IC301
Pin76(Normal Audio)?
YES
Do OSC signals appear at P3D02 pin5
(50Vp-p)
YES
YES
Check Power.
NO
Check ports of µ-CPM.
(IC501 Pins71, 72)
Check Audio input signal of IC801
Pin57(TU.A.), 7, 69(DVD.A.),
11, 73(LINE1.A.), 9, 71(LINE2.A.)
NO
Check C825, R337, R338, C371, C3A1
Check REC OSC BLOCK
(Q301, Q302, Q304~Q307)
Is “High” IC501 Pin74 in REC mode.
NO
NO
NO
Page 28
3-17
7. Tuner/IF CIRCUIT
(1) No Picture on the TV screen
No picture on the TV
screen
Does the Video signal at
the TU701 Pin16.
YES
YES
YES
Is +33V applied to TU701
Pin14?
YES
Is +5V applied to TU701
Pin3?
NO
Does the Video signal
appear at IC501 Pin 52.
NO
Does the Video signal
appear at JK901
YES
NO
Check the signal flow from IC501
Pin52 to JK901 Pin Video out.
YES
Check 33V line.
NO
Check 5V line.
NO
YES
Does the Clock signal
appear at TU701 Pin9?
Check the lIC Clock Signal
of µ-COM Pin71.
NO
YES
Does the data signal
appear at TU701 Pin10?
Replace Tuner.
Check the signal from IC301
Pin29 to IC501 Pin50.
Check the signal from IC501
Pin52 to Q924
Check the lIC Data Signal
of µ-COM Pin72.
NO
Page 29
3-18
(2) No Sound
No Sound.
Check the Vcc of TU701 Pins3, 14.
YES
Check 5V, 33V Line.
NO
Check the Tuner SiF signal at IC801
Pin57.
YES
Check the Audio of IC801 Pins78, 80.
YES
Check the Signal flow from IC801 Pins78,
80 to JK901 Audio out(L), (R)
YES
Check the Tuner SIF of TU701 Pin13.
NO
1. Check the Vcc(5.3VA, 9V) of IC801
Pins3, 5, 36, 54.
2. Check the IIC Clock and Data at IC801
Pins37, 38.
NO
Page 30
3-19 3-20
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,
R133,L124,C126)
RECTIFIER &
SMOOTING BLOCK
(D123,C127,C137,
L127)
RECTIFIER &
SMOOTING BLOCK
(D121,C126,R136)
RECTIFIER &
SMOOTING BLOCK
(D122,D125,C128,
L128,C138)
FEED-BACK
(R141,R142,
C143,R143.
R144.R145
AMP
BLOCK
R146)
12V REG BLOCK
(Q166,ZD151,C160,
R166,C159)
9V REG BLOCK
(Q164,ZD152,C161,
R168,C166)
8V REG BLOCK
(D126,IC141,R167,
C165)
3.8V REG BLOCK
(IC131,C158,R165)
33V S/W BLOCK
(Q161,R154,R155
Q173,R174,R177)
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
REG9V
8V
3.8V
33V
5.3VA
5.0V
M5V/5VT
PWR CTL'H'
Page 31
3-21 3-22
2. TU/IF BLOCK DIAGRAM
A.IN
CH S/W
REG 5V
CONTROL
V.IN
RF AGC
NC
ENABLE
CLOCK
DATA
AFT
A.OUT
SIF
TU 30V
NC
V.OUT
999 GND
100AFT
732TU.V.OUT
875 MOD A.IN
61 MOD CTL
107 5V
26 VCR 'H'
971 MOD VEDIO
71 IIC CLK
72 IIC DATA
781 SIF OUT
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
COMBI NTSC
15833V
Page 32
3-23 3-24
3. Y/C BLOCK DIAGRAM
(PB Mode)
(REC Mode)
EP PB 'A'
EP PB 'B'
SP PB 'B'
SP PB 'A'
59 58 57 55 54 53
AUDIO
ENV
MUTE
DET
HA SW
ACC
64
DET
65
P
67
P
72
P
74
P
C-ROT
RF-SW
IN
Y/C ENA
Y/C DATA
Y/C CLOCK
MAIN
C-LPF
CONV
4.21M
BPF
SUB
CONV
3.58M
BPF2
ACC
AMP
ACC
DET
CLAMP
DOUBLE
LIMFMDEM
LPF
V. H/SW55Y/C ENA
57
OUT
39
CCD
CLAMP
CNC
CLAMP
3.58M
BPF1
YNR
COMB
Y
Y/C
MIX
SUB
LPF
MAIN
DE-EM
VCA
6dB
37
36
IN
EP REC
R
66
34
69
70
R
SP REC
26
V.OUT
73
DECODER
C-LPF
Y/C DATA
Y/C CLOCK
54
53 51 50 49 48 47
SERIAL
BGA
MAIN
B-UP
CONV
AMP
ACC
4.21M
BPF
SUB
CONV
AMP
ACC
DET
DETAIL
ENH
NL
EMPHA
X-TAL
3.58MHZ
320FH
VCO
REC
APC
CLAMP
MAIN
EMPHA
FM
MOD
REC
FM-EQ
REC
APC
SLDVX01
OUT
39
38
CLAMP
LPF
CCD
CLAMP
3.58M
VIDEO
BPF1
YNR
COMB
Y
AGC
VCA
37
IN
36
34
TU/LINE1
32
DVD
30
LINE2
28
V.OUT
26
IC302
SW
BLOCK
FM
AGC
PB
FM-EQ
22
21
B
4.7K
21
B
20
22
Page 33
3-25 3-26
4. NORMAL AUDIO BLOCK DIAGRAM
(EE Mode) (PB Mode) (REC Mode)
IC301
LA71206M
IC801
LA72670M
DET
ALC
76
NORMAL
AUDIO
OUT
6
A. OUT (R)
A. OUT (L)
80
78
MOD. OUT
2
DET
9
REC
AMP
IC301
LA71206M
10
4
78
A. OUT (R)
80
A. OUT (L)
57
2
9
71
IC801
LA72670M
OUTPUT
SELECTOR
410
AMP
53
55 54
(System)
DATA
From u-COM
IC801
LA72670M
CLOCK
ENA
ALC
76
NORMAL
AUDIO
OUT
6
10
4
78
A. OUT (R)
80
A. OUT (L)
9
71
TU701
TUNER
13
SIF
1
A_IN
RF_MOD
LINE AUDIO(L) IN
LINE AUDIO(R) IN
REAR Jack
IC301
LA71206M
EQ
AMP
4
3
5
6
N.A.IN
/P HEAD
EQ
2
TU701
TUNER
13 57
SIF
1 2
A_IN
RF MOD.
LINE AUDIO(L) IN
LINE AUDIO(R) IN
REAR Jack
Page 34
3-27 3-28
5. Hi-Fi BLOCK DIAGRAM
DVD AUDIO
REAR JACK
FRONT
AUDIO INPUT
BLOCK
SIF
DVD A.IN 'L'
DVD A.IN 'R'
AV1 A.IN 'L'
AV1 A.IN 'R'
AV2 A.IN 'L'
AV2 A.IN 'R'
57
12
74
11
73
71
A
B
DEMO
DULATE
INPUT
SELECT
9
IC801
LA72670BM
Hi-Fi/
REC
24
26 27
Hi-Fi REC
Hi-Fi PB 'B'
6 4
FM MODU
Hi-Fi PB 'A'
DE MODU
OUTPUT
SELECT
80
78
3
A.OUT 'L'
A.OUT 'R'
A.OUT
To JACK
MODULATOR
A.OUT
(To Tu)
NORMAL AUDIO
OUT(T o A VCP)
NORMAL AUDIO
IN(From AVCP)
Page 35
3-29 3-30
6. SYSTEM BLOCK DIAGRAM
TO/FROM AVCP
TO/FROM DECK
TO/FROM AUDIO(Hi-Fi)
TO/FROM DVD
TO/ FROM TU/IF
5V
TO/FROM DECK
MODE S/W
T-UP END
ES501
R550
LD501
DECK IR LED
R553
R555
R557
RS501
T-UP REEL
5.3VA
MS501
SUP END
R556
RS502
SUP REEL
CST.SW/REC TAP
R531
CS501
5.3VA
GND
MODE S1
MODE S2
MODE S3
MODE S4
ES502
R564
R538
R558 C582
R544
X501
32.768KHz
R535
R537
X502
14MHz
OSC
OSC
R536
R5C6
C534
C552
C535
I-Limit
25
MODE S1
24
MODE S2
23
MODE S3
22
MODE S4
38
X in
39
X out
Xc in
35
Xc out
36
21
T-UP Sensor
20
SUP Sensor
80
T-UP Reel
79
SUP Reel
CST IN
58
14
R/C
RC601
11
76
77
CAP. PWM
DRUM PWM
95
CTL +
44
94
90
CTL -
OSC in 2
45
OSC
L511
R598
C595
C596
12 60
87
CFG
DPG
IC501
M37760
OSC out 2
9
18
16
59
13
LD CTL
CAP. REV 'H'
V. ENV
OSC
H.A.SW
D.V.Sync
V.H.SW30
A.MUTE'H'
DVD DATA OUT
DVD DATA IN
DVD RESET
A. MUTE 'H'
Vss (OSD)
Vss (SYSCON)
40
Vcc (A/D)
99
Vss (AMP)
49
88
PLL DATA
MODU CTL
POWER FAIL
Vcc (OSD)
53
98
56
50
SQPB
REC 'H'
DVD CLK
DVD ENA
A. H.SW
CV OUT
PLL CLK
Vcc
17
74
15
C.ROT
84
67
S clk
66
S in
65
S out
65
66
67
82
85
8
A. ENV
19
68
REC 'H'
74
71
CLK
72
DATA
52
100
AFT
71
72
26
VCR 'H'
61
78
34
Vcc
(SYSCON)
(SERVO)
37
C500 C517
CV IN
COMP IN
RESET
+ +
TO/FROM AVCP
IC5F1
TO/FROM DVD
TO/FROM AUDIO(Hi-Fi)
Hi-Fi ONLY
TO/ FROM TU/IF
Q503
R541
Q501
R583
L512
C592
+
+
R529
C503
DISPLAY
5.3VA
5V
3
3
IC504
Vcc
1
IC505
Vcc
1
2
2
GND
GND
+
C561
L501
Page 36
3-31 3-32
A B C D E F G H I J K L M N O P Q R ST
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.
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. SPECIALCOMPONENTS 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 UNTILTHE 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 37
3-33 3-34
2. TU/IF CIRCUIT DIAGRAM
A
1
2
3
4
5
6
7
8
9
10
11
12
B C D E F G H I J K L M N O P Q R ST
Page 38
3-35 3-36
3. A/V CIRCUIT DIAGRAM
A
1
2
3
4
5
6
7
8
9
10
11
12
B C D E F G H I J K L M N O P Q R ST
Page 39
3-37 3-38
4. Hi-Fi CIRCUIT DIAGRAM
A
1
2
3
4
5
6
7
8
9
10
11
12
B C D E F G H I J K L M N O P Q R ST
Page 40
3-39 3-40
5. JACK CIRCUIT DIAGRAM
A
1
2
3
4
5
6
7
8
9
10
11
12
B C D E F G H I J K L M N O P Q R ST
Page 41
6. SYSTEM CIRCUIT DIAGRAM
A
1
2
3
4
5
6
7
8
9
10
11
12
B C D E F G H I J K L M N O P Q R ST
3-41 3-42
Page 42
3-43 3-44
* IC501 Waveform
Tek Stop : 10.0 KS/s
280 Acqs
M5.00ms Ch1Ch1 3.04 V1.00 V
T
T
1
Tek Stop : 250KS/s
299 Acqs
M 200µs Ch1Ch1 3.04 V1.00 V
T
T
1
Tek Stop : 10.0KS/s
18 Acqs
M 5.00ms
Ch1
Ch1
3.04 V
Trigger Position: 12%
1.00 V
T
1
T
Tek Stop : 10.0 KS/s
27 Acqs
M5.00ms Ch1Ch1 3.04 V1.00 V
T
T
1
Tek Stop : 10.0 KS/s
35 Acqs
M5.00ms Ch1
Ch1
3.04 V1.00 V
T
T
1
Tek Stop : 50.0 KS/s
120 Acqs
M1.00ms Ch1Ch1 3.04 V1.00 V
T
T
1
T
Tek Stop : 5.00KS/s
2 Acqs
M 10.00ms
Ch1
Ch1
340V
Trigger Level: 340mv
500mV
T
1
IC501 Pin 18
REC/PB
IC501 Pin 13
QUE/REV
IC501 Pin 13
QUE/REV
IC501 Pin 95
REC
IC501 Pin 87
REC/PB
IC501 Pin 90
REC/PB
(DPG/DFG)
(DPG)
(DFG)
IC501 Pin 97
PB
(CTL OUT)
IC501 Pin 94
REC
• WAVEFORMS
* IC301 Waveform
IC301 Pin 9
100mV/10msec DIV
VV/EE
(Main De-Emphasis out)
IC301 Pin 12
100mV/10msec DIV
PB
(Main De-Emphais
Peacking)
IC301 Pins 33, 36, 37
100mV/10msec DIV
VV/EE
Clamp Drive IN Pin 33
Y-out(to 1H CCD) Pin 36
Y-out(from 1H CCD) Pin 37
IC301 Pin 15
200mV/10msec DIV
EE
(VIDEO IN)
IC301 53 Pin
100mV/0.2msec DIV
REC/PB
(2fsc)
IC301 31 Pin
1.0V/20msec DIV
VV/EE
(C-SYNC OUT)
IC301 29 Pin
500mV/10msecDIV
VV/EE
(VIDEO OUT)
IC301 Pin 43
200mV/20msec DIV
PB
(C.OUT)
IC301 Pins 46, 57
200mV/20msec DIV
VV/EE
from 1H CCD Pin 46
to 1H CCD Pin 57
IC301 Pin 67
100mV/0.2msec DIV
PB/REC
(3.58MHz X-TALIN)
IC301 Pin 77
100mV/5msec DIV
PB
(PB RF out)
IC301 Pin 86
500mV/2msec DIV
SP REC
(REC RF)
IC301 Pin 90
500mV/2msec DIV
EP REC
(REC RF)
Page 43
3-45 3-46
• CIRCUIT VOLTAGE CHART
MODE
PIN NO.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
STOP PLAY
IC202
0.02
0
8
0.03
0
2.7
2.93
2.7
2.93
2.72
2.92
1.64
8.04
8.04
2.95
0.01
0
2.79
0.46
2.77
2.94
0.46
0
0
0.46
0
0
0.46
0
2.7
0
0
0
0.02
3.2
0
IC203
2.4
2.72
2.7
0
0
1.04
0.12
7.8
IC401
1.59
0
1.58
0
3.12
4.03
2.5
2.45
1.28
0.56
0.62
1.73
2.23
2.23
3.22
2.11
1.74
2.24
1.74
1.75
3.2
3.2
1.74
0.01
2.13
2.13
0.01
3.22
2.58
2.75
1.27
2.75
2.77
2.74
1.74
0.28
4.8
4.84
4.84
0.03
0.4
1.6
1.6
1.6
3.17
4.9
2.5
2.5
MODE
PIN NO.
0
0
9
10
11
12
13
14
15
16
STOP PLAY
0
2.4
2.94
2.94
2.121
3.18
3.18
1.58
0
2.47
0
0
0
3.2
3.21
1.58
IC402
1
5.54
2
5.54
3
5.5
4
5
5.5
6
5.54
7
5.54
8
0
12.1
5.52
5.52
5.52
0
0
5.3
5.52
5.52
12.1
IC5F1
1
2.45
2
4.9
3
4.93
4
4.88
5
6
0
0
0
0
0
0
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
0.7
7
0.71
8
0.72
9
0.72
1.24
1.74
2.4
0.9
1.37
0.55
2.08
1.85
2.2
1.84
2.15
4.9
4.92
4.88
5
5
0
0
2
0
4.5
2.8
2.57
2.5
2.7
2.3
2.77
0.94
1
1.93
2.44
2.27
2.21
4.5
0
2
2.16
2.2
2.34
0
IC602
1
1
8
0
10
11
12
3.2
2
3
3.2
4
1.6
5
6
7
1.8
8
9
3.2
2.14
0.53
3.25
0
0
0
0
0
1
3.25
1
1
0
1
1
3.25
1
1
0
MODE
PIN NO.
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
1
2
3
4
5
6
7
8
9
10
11
12
STOP PLAY
2.16
3.2
0
3.15
2.7
3
2.3
0.25
0.44
0
0
0.06
0.25
0.25
3.2
0
0.36
0.34
0
0.32
0.32
0.32
0.32
0
3.18
1.77
0.33
0
0
0
0
0
0
0
0
0.32
3.23
0.31
0.3
0
0.3
0
IC603
3.2
3.2
0.01
3.2
3.18
0
3.18
3.17
3.2
0
3.2
4.08
0.9
3.25
0.9
0.81
0.82
0.83
0.82
0.83
0.8
0.8
0.8
0.8
0.84
0.83
3.22
0
1
1
1.05
1.03
1
1
1
0
3.2
1.8
1.04
0
0
0
3.22
0
0
0
0
0
3.22
3.22
1
0
1
0
3.22
3.2
0.01
3.22
3.22
0.01
3.22
3.22
3.22
0
3.22
4.1
MODE
PIN NO.
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
STOP PLAY
3.2
0
0
3.2
3.2
0.01
0.01
0.03
3.18
0.01
3.2
3.18
3.2
3.2
0
0
0.8
0.54
0.53
0.54
0.56
0.6
0.77
0.8
3.16
0.82
0.77
0.76
0.7
0.77
0.74
0.73
0.75
0
3.16
3.2
IC604
0
1.68
0
1.7
4.28
1.7
5.2
0
2.3
0
0
0.09
3.2
0
2.6
0
1.31
0
3.22
0
0
3.22
3.22
0.01
0.01
0.01
3.22
0.01
3.22
3.22
3.22
3.22
0
3.2
0.93
0.95
0.8
0.78
0.74
0.76
0.8
0.9
3.2
3.2
0.8
0.76
0.8
0.83
0.82
0.83
0.8
0
3.2
3.2
0
0.95
0
1.26
3.44
1.35
5.2
3.2
0.1
0
0
5.23
3.2
0
2
0
1.11
0
MODE
PIN NO.
19
20
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
STOP PLAY
0
5.23
IC609
4.97
2.31
0
1.32
0
1.08
0
2.4
0.05
2.31
4.2
2.3
4.97
2.34
0
0
0
2.38
0
2.34
0
0
1.56
0.03
0.03
2.38
0.03
4.96
IC801
0
2.17
9.27
2.48
5.23
1.98
0
0.01
0
0
0
2.5
1.97
2.49
2.52
0
0.48
0.49
2.54
2.54
2.53
0
0
0
5.23
4.95
2.26
4.95
1.43
0.01
1.45
0
2.3
0.05
2.25
4.2
2.265
4.9
2.26
0
2.3
0
2.3
0
2.3
1.8
0
1.66
0
0.03
2.31
0.03
4.94
0
2.53
9.2
2.5
5.23
1.98
0
0.73
0
0
0
2.5
1.96
2.51
5
2.5
0
0.48
2.53
2.54
2.53
2.53
0.17
MODE
PIN NO.
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
STOP PLAY
2.27
0
2.27
2.27
0
3.2
0
2.5
5.05
2.66
0
0
5.1
4.74
4.75
5.13
0
2.52
2.52
2.53
2.53
0.49
5.09
2.49
0
4.4
0
1.74
1.23
3.88
9.27
3.88
2.16
0
4.58
2.51
3.88
3.2
3.83
3.85
2.5
3.9
4.11
3.4
3.95
0
0
0
3.9
0
2.49
3.89
3.2
0.01
4.14
2.24
0
2.25
2.25
0
3.25
0
2.53
5
2.64
2.64
0
5
4.75
4.74
5.12
0.97
2.55
2.53
2.54
2.58
0.49
5.07
2.51
2
0
0
1.72
1.24
3.89
9.2
3.9
2.18
4.6
2.48
3.9
3.2
3.78
3.86
2.5
3.9
4.1
3.85
3.96
0
0
0
3.9
0
2.5
3.9
3.2
0
4.2
0
MODE
PIN NO.
80
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
STOP PLAY
4. 13
IC301
0.06
0.05
0.06
5.08
2.17
2.57
2.83
1.9
1.87
2.36
2.08
1.65
0
1.38
2.8
0.18
0
0
2.78
0
2.8
5
2.3
0.33
2.11
0
0.32
0.03
1.68
2.22
0.14
2.25
2.11
1.85
3.03
2.38
3.03
2.14
1.48
2.1
2.7
1.97
2.1
0
3.26
3.26
5.05
4.92
3.56
5.05
2.25
5.05
2.57
4. 19
0.06
0.06
0.06
5.1
2.1
2.56
2.83
2
1.3
1.42
1.88
0.58
0
2.31
2.8
1.9
2.8
1.96
2.8
4.1
2.8
5
2.32
0.44
2.13
2.77
0.35
0.03
2.15
2.85
0.22
2.2
2.12
1.86
3
2.4
3
2.17
1.52
2.11
2.76
2
2
0
3.2
3.23
5.1
4.95
3.53
5.08
2.23
5.1
2.6
MODE
PIN NO.
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
1
2
3
4
5
6
7
STOP PLAY
0
2.06
0
2.15
2.02
4.95
4.1
2.37
2.18
1.97
2.22
1.93
2.16
2.45
2.03
1.8
1.9
0.23
4.92
4.75
4.75
2.63
2.2
2.83
0.03
0
2.83
0.04
0.01
0.13
5
2.28
2.28
2.28
0
2.27
2.27
2.27
5.05
0.45
0.01
2.52
0
0
2.36
0
2.57
IC501
0.97
5.2
5.2
0
0
5.1
0.2
0
2.005
0
2.11
1.9
0
5
4.15
1.37
2.2
2.61
2.24
2.31
2.18
2.45
2
1.8
0.76
4.95
5
0
2.65
2.12
2.84
2.15
0
2.54
0.04
0.01
0.02
5
1.37
1.4
1.35
0
1
1
1
5
0.44
2.5
2.5
2.5
0
2.2
0
2.57
0.08
5.2
5.2
0
1
5
0.74
MODE
PIN NO.
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
STOP PLAY
0.17
0.17
0.01
0.03
0.24
0.03
4.8
0.01
0.3
0.33
5.14
5.14
4.32
4.28
5.2
5.21
5.14
5.14
0.01
0.01
0.01
0.01
5.17
1.46
5.17
2.22
2.3
0.25
0.28
2.4
1.44
0.15
0.2
1.37
5.04
1.4
0.01
2.6
4.15
0.01
0.09
0.16
0.01
3.4
0.01
0.03
0
2.57
0.01
0.01
2.57
2.57
0.14
0.02
0
0
0
0
0
0
0
2
0
0
0
0
0
0
0
5.1
5.2
5.2
0.01
5.1
0.1
5.1
0.01
0.01
0.01
0.01
0
5
0
1.35
0
0
2.29
0
0.57
0.57
0
2.37
2.37
0
1.36
0
0
1.64
0.7
1.63
5.1
2.6
1.96
1.77
01.56
0
4.1
2.6
4.13
0
Page 44
3-47 3-48
MODE
PIN NO.
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
STOP PLAY
0.05
0.05
2.25
2.4
5.2
4.94
4.9
4.9
4.77
4.74
0.01
0.01
0.8
0.82
0.01
4.8
4.87
4.85
0
4.11
4.86
0
4.26
0.13
2.6
0
0.12
0
2.59
2.6
0
2.54
2.54
2.58
0.28
5.2
5.2
0.16
IC601
1.4
0
2.45
3.1
0
0
3.15
0
3.15
3.15
3.15
3.1
3.1
1.6
0
0
0.05
0.05
2.3
0.06
5.2
4.94
4.88
4.92
4.94
5.12
0.01
0.01
0.01
2.66
2.66
4.8
4.44
4.21
2.58
4.17
4.86
0.01
4.2
2.36
0.3
1.37
2.5
2.5
0.03
2.52
2.52
2.54
2.54
5.1
5.2
0.16
0.06
1.6
2.52
3.21
3.2
3.2
3.2
3.2
3.2
3.2
3.17
3.21
1.68
0.65
MODE
PIN NO.
0
0
0
0
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
STOP PLAY
1.56
0
0
0
0
0.05
3.2
0.8
0.05
0.49
0.63
0
1
3.19
0
0.5
0.7
0.55
0
1.28
1.68
0.05
0.4
0.6
2.45
2.43
2.46
0.8
0
0
1.77
2.9
0
0
0
0
0
0
1.2
1.28
1.56
1
1
1.11
1.11
1.11
1.11
0.03
0
1
0.96
0.93
0.23
1
0
0
1.35
0
0
0
0
0.05
0.84
0.66
0.58
0
0.03
1.3
3.22
0
0
0.7
0.55
0.02
1.3
1.66
0
2.5
2.44
3.21
2.42
2.46
0.01
0.01
0.01
0
1.67
0
0
1.6
1.6
0
0
0.09
0
0
1.07
1
0
0
0
0
1.7
0
0.64
0.64
0.64
0.62
3.14
0.01
MODE
PIN NO.
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
STOP PLAY
0
0.15
0.53
2.4
2.4
3.2
3.22
3.22
3.22
1.78
1.3
1.8
1.21
1.3
1.4
2.3
1.4
0.82
0.81
1.71
1.75
0.92
0.93
0.93
0.93
2.52
2.57
2.57
2.26
1.65
3.18
3.2
0.47
3.2
3.2
0.02
0.03
0.02
3.19
1.79
1.69
1.56
1.79
4.1
3.08
2.27
0.04
2.41
2.46
3.06
3.13
3.13
0
0.01
0
0.01
3.22
1.83
0
2
0
0
0
0
0
0
0
0.63
0.81
0.7
0.7
1.2
0.7
0.7
0.7
0.69
0.68
1.7
1.8
0
0.7
0.7
0.66
0.67
0.66
0.65
2.38
2.5
1.68
3.2
0.03
0
0
3.2
0.9
3.2
3.2
0.02
0.03
0.02
3.21
1.93
1.66
1.66
0
1.79
0
4.1
3.24
3.23
MODE
PIN NO.
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
STOP PLAY
2.26
3.18
3.19
3.18
3.18
3.18
3.18
3.16
3.19
3.19
3.2
3.2
0.45
0.43
0.47
0.42
0.48
1.03
1.03
1.76
1.03
1.04
1.05
0.94
0.92
1.04
1.05
3.24
3.19
3.2
3.19
0.77
3.19
0.77
3.17
3.17
1.68
3.22
3.22
3.22
3.22
0
3.21
3.21
3.2
3.22
0
3.22
0
0
3.22
3.22
3.22
0
3.22
3.21
3.21
3.21
3.21
0
3.23
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0.98
0.99
0.99
0.98
0.98
0.98
0.98
1
3.22
0
0.81
0.81
0.81
0.81
0.01
0.01
3.2
0.01
3.2
3.2
1.66
0
0.01
3.2
3.2
0.01
3.2
3.2
3.2
3.2
3.2
MODE
PIN NO.
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
STOP PLAY
2.23
2.2
2.92
2.3
1.7
2.22
2.22
3.2
2.24
2.28
0.01
0.01
0.24
3.22
2.65
3.22
2.1
3.2
3.2
0
3.2
0
0
3.2
2.46
2.48
0
2.52
0
0
0
0
0
0
0
0
2.4
2.38
2.39
2.15
3.23
2.36
2.37
1.67
0
2.4
2.4
0
0
0
3.25
3.25
2.37
0.01
Page 45
3-49 3-50
PRINTED CIRCUIT DIAGRAMS
1. MAIN P.C.BOARD (TOP SIDE)
Page 46
3-51 3-52
2. MAIN P.C.BOARD (BOTTOM SIDE)
Page 47
3-53 3-54
3. POWER P.C.BOARD
LOCATION GUIDE
NOTES) Warning
NOTES) Parts that are shaded are critical
NOTES) With respect to risk of fire or
NOTES) electricial shock.
Page 48
3-55 3-56
4. KEY P.C.BOARD
Page 49
Page 50
3-57
ELECTRICAL TROUBLESHOOTING GUIDE
DVD PART
1. POWER CHECK FLOW
No 3.4VA.
No 3.4VA
Is 3.4VA section working?
Is 3.4V present at emitter
of Q121?
Replace Q121.
Replace IC101.
Is there a DC voltage at
Cathode of D105 or D107?
Check FR101
No 5V
Is 3.4VA section working?
Replace Q126.
Is 5.6V present at collector
of Q126?
NO
NO
YES
YES
YES
Check D105/D106/D107/
D108 and replace.
YES
YES
A. B.
NO
NO
NO
Page 51
3-58
2. SYSTEM OPERATION FLOW
NO
NO
NO
YES
YES
YES
YES
YES
Power On
1. 186 CPU initializes SERVO,DSP & RISC registers
2. Write RISC code to SDRAM
3. Reset RISC
Show LOGO
Tray Closed ?
Tray Close to Closed position
SLED at Inner Side ?
SLED Moves to Inner Position
1. Judge whether have disc and disc type
2. Jump to related disc reading procedure
Recieve OPEN/CLOSE Key?
1. Execute Pressed Key & IR Key
2. System operation Routine Loop
1. Stop Playback & Open Tray
2. Display tray open message & LOGO
Receive CLOSE Key?
Page 52
3-59
3. Test & debug flow
TEST
Check the AC Voltage
Power PCBA(110V or 220V)
YES
Switch on the Power PCBA
YES
Is the DC Voltage outputs OK?
(5V, 3.3V, 12V, 5.6V MOTOR)
YES
Make sure the main PCBA don't short on
VCCs and switch it on.
YES
Is 3.3V outputs normal on main PCBA?
YES
Connect to PC RS232 Cable and update
the FLASH memory code.
YES
Update FLASH successfully?
YES
A
Replace power PCBA or AC transformer.
NO
Repair or Replace Power PCBA
NO
Check the regulators or related diodes.
NO
Is 1.8V Voltage normal for Zoran IC
YES
1. Check Q203. 2. Check D201.
3. Check IC102
NO
1. Check 27MHz system clock.
2. Check system reset circuit.
3. Check FLASH R/W enable signal
PRD,RWR.
4. Check RS232 SIGNALS.
5. Check FLASH Memory related circuit.
NO
Page 53
3-60
NO
NO
YES YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
A
RESET or Power On.
Flash Memory operates
properly?
Show LOGO?
Does Tray move inside when
it is not at closed position?
B
Check connection lines between
FLASH & ZR336888 and the FLASH
access time whether is suitable or not.
SDRAM works properly?
Check connection lines
between SDRAM & ZR36882
and the SDRAM is damaged.
ZR36882 VIDEO outputs
properly?
Check the related circuit of
ZR36882
Have TV signal output?
Check AV cable connection
to TV set.
Normal OUTSW & INSW
signals?
Check the filtering and amp
circuit of TV signal.
Check the load OPEN &
CLOSE switch
Normal OPEN & CLOSE
signal?
Check the Tray control IO
pins on ZR36882 &
AM5869S
Normal LOAD+ & LOAD signal?
Check the cable connection
between main PCBA and
loader.
Check the Tray control
amplifying circuit on Motor
driver.
Page 54
3-61
B
Motor Driver MUTE Pin is
High?
Does the SLED move to
inner side when it is at outter
position?
Do not put in disc and tray
close.
Optical Lens has movements
for searching Focus?
C
NO
NO
YES
YES
YES
YES
YES
YES
Check the connection line of
MUTE signal.
NO
Is SLED_S DC Level higher
than 1.65V?
Check the related circuit of
FMSO.
NO
SLED+ and SLED- output
properly?
YES
Check the amp circuit on
motor driver.
Check FOCUS_S connection
On ZR36882 and motor dirver.
NO
NO
Check the cable connection
with MECHA.
Proper FOCUS_S outputs to
motor driver?
Proper FACT+ &
FACT- outputs?
Check the amp circuit on
motor dirver.
NO
Check cable connect on with
pick-up head.
Page 55
3-62
C
LD_DVD or LD_CD
output properly?
Laser turns on when
reading disc?
Put disc in?
Disc ID is correct?
Does spindle rotate?
D
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
Check the laser power circuit
on ZR36882 and connecting
to power transistor.
NO
Collector voltage of power
transistor is OK?
Check the related circuit on
laser power transistor
NO
Check cable connection
between transistor ouput
and pick-up head.
YES
YES
YES
Check the related circuit
on ZR36882 RFL signal.
Check SPINDLE_S related
circuit on ZR36882.
NO
NO
Check the spindle control
amp circuit of motor driver.
NO
Laser off
Proper RF signal on
ZR36882?
Check LD_DVD & LD_CD
signal
Proper SPINDLE_S signal
on ZR36882
SP+ & SP- output properly?
Check the cable connection
between spindle and main
PCBA.
Page 56
3-63
D
Proper signals on A,B,C,D
of ZR36882
Focus ON OK?
Track On OK?
Disc is play ?
E
NO
NO
NO
YES
YES
YES
YES
YES
Check connections between
ZR36882 and pick-up head.
NO
Check FE signal on
ZR36882
YES
Check the FOCUS_S
connection on ZR36882
and motor driver.
NO
Check FOCUS_S signal
on ZR36882
YES
YES
Check the TRACK_S
connection on ZR36882
and motor dirver.
NO
Check the tracking control
amp circuit on motor driver.
NO
Normal TE Signal on
ZR36882?
NO
Check the related
circuit on ZR36882
Properly TRACK_S signal
on ZR36882?
TACT+ & TACT- output
properly?
Check cable connection on
pick-up head.
Check RF signal waveform.
Page 57
3-64
E
Audio DAC received
correct data stream?
Normal Audio output
when disc playback?
Normal IR.VFD & Front
panel key functions?
TEST END
NO
NO
YES
YES
YES
YES
Check connection between
ZR36882 & Audio DAC.
NO
Normal Audio DAC out?
YES
Check the related circuit of
Audio DAC.
NO
Check Audio filter, amplify,
mute circuit.
Communications between
IR.VFD Front panel key &
ZR36882 is normally?
NO
Check communication lines
on ZR36882
Check the cable connection
on Front panel.
Page 58
3-65
DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING
1. SYSTEM 27MHz CLOCK, RESET SIGNAL
1) ZR36882 main clock is at 27MH(X601)
FIG 1-1
3.1V,27MHz
2) ZR3682 reset is low active
FIG 1-2
Reset Time
3.3VA
PWR_CTL
RESET
Page 59
3-66
2. SDRAM CLOCK
1) SDRAM clock is at 143MHz
FIG 2-1
IC603 PIN38
CLK=143MHz,Vp-p=3.3V
3. TRAY OPEN/CLOSE SIGNAL
1) Tray open/close waveform
FIG 3-1
OPEN
OPEN CLOSE
CLOSE
LM-
LM+
Page 60
3-67
2) Tray open waveform
FIG 3-2
3) Tray close waveform
FIG 3-3
OPEN
CLOSE
LM-
LM+
OPEN
CLOSE
LM-
LM+
Page 61
3-68
4. SLED CONTROL RELATED SIGNAL(NO DISC CONDITION)
FIG 4-1
5. LENS CONTROL RELATED SIGNAL(NO DISC CONDITION)
FIG 5-1
FOCUS_S
FOCUS+
FOCUS-
SLED_S
DRVSB
SLED+
SLED-
Page 62
3-69
6. LASER POWER CONTROL RELATED SIGNAL(NO DISC CONDITION)
FIG 6-1
7. DISC TYPE JUDGEMENT WAVEFORM
FIG 7-1(DVD)
DCLK = 128MHz, Vp-p=2.2, Vmax=2.7V
FACT+
FE
SBAD
VR_CD
DVD_LD
CD_LD
Page 63
3-70
FIG 7-2 (DVD)
FIG 7-3 (CD)
FACT+
FACT+
FE
FE
SBAD
SBAD
Page 64
3-71
FIG 7-4 (CD)
8. FOCUS ON WAVEFORM
FIG 8-1 (DVD)
FE
FOSO
FACT+
FACT-
FACT+
FE
SBAD
Page 65
3-72
FIG 8-2 (CD)
9. SPINDLE CONTROL WAVEFORM(NO DISC CONDITION)
(DVD) FIG 9-1
FOCUS
FACT+
SPINDLE_S
SP+
SP-
FE
FACT-
Page 66
3-73
10. TRACKING CONTROL RELATED SIGNAL(System checking)
FIG 10-1 (DVD)
FIG 10-2 (CD)
TE
TRACK_S
TACT+
TACT-
TE
TRACK_S
TACT+
TACT-
Page 67
3-74
11. RF WAVEFORM
FIG 11-1
12. ZR36882 AUDIO OPTICAL AND COAXIAL OUTPUT(SPDIF)
FIG 12-1
RFO
SPDIF
Page 68
3-75
13. ZR36882 VIDEO OUTPUT WAVEFORM
1) Full colorbar signal(CVBS)
FIG 13-1
2) Y
FIG 13-2
JK702 pin6
JK702 pin7
Page 69
3-76
14. AUDIO OUTPUT FROM AUDIO DAC
1) AUDIO L/R
FIG 14-1
3) C
FIG 13-3
JK702 PIN8
JK702 PIN4,5
1KHz 0DB
Page 70
3-77
2) Audio Related Signal
FIG 14-2
AOUT0
ABCK
ALRCLK
Page 71
3-78
BLOCK DIAGRAMS
1. SYSTEM BLOCK DIAGRAM
E
KARAOK
MIC_IN
MIIC_DET
L
KARAOKE OPTION
A
IC607
CS5331
IC605
EEPROM
5V
KS24C021CS
MC
R
RCLK
AMCLK
ABCL K
AL
L
R
OPTICAL
+12V
MUTE
MUTE
MD
CIRCUIT
MUTE_C
IC402
OP-AMP
NJM4580
O
-
-
ALPCLK , ABCLK
A_R +/
AMCLK , AOUT
A_L +/
Y / C
ASPDIF COAX
Pb(B)
Pr(R)
Y(G)
DV33
DV33
M
IC603
SDRA
HY57V641620E
M
IC604
FLASH RO
MX26LV160T
AIN
MEMDA[0:14]
MEMAD[00:
18]
RAMDAT[00:15]
RAMADD[00:10]
RAMBA
FLASHCS-
MEMRD-
MEMWR-
RAMDQ
PCLK
5V
5V
RFV33/DV33/1.8V
M
DVD_ENA*
DVD_CLK
DVD_DATA*
5V/REG12V
IC601
ZR36882ELCG
RSMCS0
RAMRAS#
RAMCAS-
RAMWE-
DSP/MPEG/RF
27MHz
X-TAL
IC801
HIFI
TDA9605H
IC501
VCR MICOM
VCR_DATA
DVD_RESET
CN602
DVD:RF,A,B,C,D
CD:RF,A,B,C,D,E,F
C
PICKSEL
HOMESW
DVD_LD,CD_LD, V
OUTSW , INSW
OPEN, CLOSE
REG_9V
8V
3.3V
MOTOR_VCC
REG_12V
DRVSB,TRA CK_ S,FOCUS_S,SLED_S SPINDLE_S
HYPER_TERMINAL
CN601
DOWNLOAD
MN101DF10G
H
PWR_CTL_
33V
5.3VA
5.0V
M5V/5VT
DISC
UP
PICK
M
SPINDLE
MOTOR
FACT+/-,TACTT +/ -
MOT_SPDL +/-
SLED
MOTOR
(FEEDING)
MOTOR
LOADING
DECK MECHANISM
BOARD
M
M
SLED+,SLED--
LOAD+/-
IC201
MOTOR
AM5869S
DRIVER
M5V
POWER
50HZ/60Hz
AC 90V~240V
Page 72
3-79
2. SERVO BLOCK DIAGRAM
M
RO
FLASH
]
EEPROM
CN601
DOWNLOAD
27MHz
X601
FLASHCS-
MEMRD-
MEMWR-
MEMAD[0:19]
MEMDA[0:15
L
X-TA
IC601
SCL, SDA
ZR36882ELCG
MPEG / DSP/RF
SENS +/-
SPDL_
DRVSB
RXD, TXD
FOCUS_S, TRACK_S,
S,
SLED_S, SPINDLE_
SE
OPEN ,CLO
iver
MD
CD_MD, DVD_
DVD_LD, CD_LD , VR_CD , VR_DVD
SEL
PICK
DVD: A,B,C,D, RF
F,RF
CD: A,B,C,D, E,
HOMESW,INSW,OUTSW
FACT +/-, TACT +/-
IC201
AM5869S
Motor Dr
+/-
SLED +/-
MOT_SPDL
-
LOAD +/
DISC
M D
Page 73
3-80
3. AUDIO & VIDEO IN/OUT BLOCK DIAGRAM
COAXIAL
Y
Y
OPTICAL
C
V.IN
R6
A.IN_L
A.IN_
V_OUT_2
A.OUT_R
A.OUT_L
DVD_A_L
IC801
DVD_A_L
HI-FI
DVD_A_R
DVD_A_L
DVD_A_R
DVD_A_R
V.OUT
Pb
Pr
A.OUT_L
A.OUT_R
A.OUT_L
A.OUT_
V.IN
R
A.IN_L
V_OUT_1
A.IN_L
A.IN_R
A.IN_R
IC402
OP-AMP
Pb / Blue
Pr / Red
MUTE_C
A_L+/-
A_R+/-
M
IC605
EEPRO
SCL
SDA
ASPDIF
Pr / Red
Y
C
Y / Green
S/W
IC903
BH78968FS
V_IN
Y
Y / Green
C
EU1_V_OUT
Pb / Blue
P
IC301
AVC
IC601
MPEG
ZR36882
Page 74
3-81 3-82
A
1
2
3
4
5
6
7
8
9
10
11
12
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 75
3-83 3-84
2. SERVO CIRCUIT DIAGRAM
A
1
2
3
4
5
6
7
8
9
10
11
12
B C D E F G H I J K L M N O P Q R ST
Page 76
3-85 3-86
3. AV/JACK CIRCUIT DIAGRAM
A
1
2
3
4
5
6
7
8
9
10
11
12
B C D E F G H I J K L M N O P Q R ST
Page 77
Page 78
DECK
MECHANISM PARTS LOCATIONS
• 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 T ension..............................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. Check of Traveling Device after Deck
Assembly .................................................4-18
8-1. Audio, RF Normalization Time
(Locking Time) Check 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 79
DECK MECHANISM PARTS LOCATIONS
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 Capstan3 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
Starting
No.
Procedure
Part Fixing Type
Ref.
Draw-
ings
Posi
tion
NOTE : When reassembling, perform the
procedure in the reverse order.
(1) When reassembling, confirm Mechanism and Mode
Switch Alignment Position
(2) When disassembling, the Parts in the "Starting No."
column should be removed first."
T:Top, B:Bottom
9
2
6
11
1
33
14
15
7
35
4
3
5
10
8
12
18
16
17
19
13
15
Page 80
4-2
DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM
Cap, FPC
Drum Assembly
Flat Cable
(S1)
(S1)
(S1)
Holder FPC
H1
H2
1. Disassembly of Drum Assembly
(Figure A-1)
1) Separate the flat cable 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 81
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 82
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 83
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 84
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 85
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 86
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 87
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 88
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 89
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 90
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 A TG
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 91
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 92
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
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
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 93
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 94
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 95
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 96
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 97
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 98
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.
Page 99
PROTECTION, MAINTENANCE AND CHECK OF VIDEO FUNCTION
4-21
5-2) Grease Applications
(1) Grease Application Method
Apply grease by using a cloth swab or brush. Care must
be exercised so that excess quantity should not be
used. If the excessive quantity is applied, wipe it with
the gauze soaked in alcohol (Isopropyl Alcohol).
NOTE: POSITION OF GREASE APPLICATION
(2) Regular Grease Application
Apply grease to the designated application position
every 500 hour.
5
4
2
1
3
(1) Inner Side Surface and Top
Surface of Loading Path
(2) Stable Adhesion Part of Base
P2, P3
(3) Arm Pinch Shaft
(4) Gear Wheel Shaft
(5) Reel S. T. Shaft
(1) (2) (3) (4): KG-684G
(Green)
(5): PL-433 (Yellow)
Cam Part
(PL-433.Yellow)
Gear Part
(PL-433.Yellow)
Boss Part Side Wall
(PL-433.Yellow)
Gear Part Side Application
(PL-433.Yellow)
Cam Part Side Application
(KG-684G.Green)
Gear Sector Gear Cam
Base Loading Gear Drive
Inner Surface of
Guide Rail
(KG-684G.Green)
Chassis (L) Chassis (R)
Gear Part
1
2
3
4
6
5
7
(1) Inner Side Surface and Top
Surface of Loading Path
(2) Stable Adhesion Part of Base
P2, P3 Coil
(3) Gear Cam Shaft
(4) Gear Drive Shaft
(5) Clutch Shaft Groove
(6) Guide Part on the Plate Slider
Side Wall (Left)
(7) Guide Part on the Plate Slider
Side Wall (Right)
(1) (2) (3) (4) (5) (6) (7): KG684G (Green)
Chassis (TOP)
Chassis (Bottom)
Cam Part
(KG-684G , GREEN)
Cam Part
(KG-684G , GREEN)
Gear Rack F/L
Lever, Brake Driving Cam Part
Side Wall Guide Part
Lever F/R Driving Part
Side Wall Guide Part
Lever, Spring Driving Part
Lever Tension Driving Cam Part
Gear Sector Driving Part
Plate Slider
Page 100
PROTECTION, MAINTENANCE AND CHECK OF VIDEO FUNCTION
4-22
Lever, F/R, Base, Tension GEAR AY, P2 & P3
LEVER, F/R
Clutch Contact Part
(PL-433, Yellow)
Tension Arm Party
Hinge Part (PL-433, Yellow)
BASE, TENSION
PL-433
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