LG RC7323NP2L, RC7812NP2S Service Manual

1-1
SECTION 1
SUMMARY
CONTENTS
PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS ............. 1-2
SERVICING PRECAUTIONS .................................................................................................. 1-3
THE STEPS FOR CHANGE THE OPTION CODE ........................................................... 1-4
SPECIFICATIONS ...................................................................................................................... 1-7
1-2
IMPORTANT SAFETY NOTICE
This manual was prepared for use only by properly trained audio-video service technicians.
When servicing this product, under no circumstances should the original design be modified or altered without permission from PHILIPS Electronics Corporation. All components should be replaced only with types identical to those in the original circuit and their physical location, wiring and lead dress must conform to original layout upon completion of repairs.
Special components are also used to prevent x-radiation, shock and fire haz­ard. These components are indicated by the letter “x” included in their compo­nent designators and are required to maintain safe performance. No deviations are allowed without prior approval by PHILIPS Electronics Corporation.
Circuit diagrams may occasionally differ from the actual circuit used. This way, implementation of the latest safety and performance improvement changes into the set is not delayed until the new service literature is printed.
CAUTION: Do not attempt to modify this product in any way. Never perform customized installations without manufacturer’s approval. Unauthorized modi­fications will not only void the warranty, but may lead to property damage or user injury.
Service work should be performed only after you are thoroughly familiar with these safety checks and servicing guidelines.
GRAPHIC SYMBOLS
The exclamation point within an equilateral triangle is intended to alert the service personnel to important safety information in the service literature.
The lightning flash with arrowhead symbol within an equilateral tri­angle is intended to alert the service personnel to the presence of noninsulated “dangerous voltage” that may be of sufficient magni­tude to constitute a risk of electric shock.
The pictorial representation of a fuse and its rating within an equi­lateral triangle is intended to convey to the service personnel the following fuse replacement caution notice:
CAUTION: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ALL FUSES WITH THE SAME TYPE AND RATING AS MARKED NEAR EACH FUSE.
SERVICE INFORMATION
While servicing, use an isolation transformer for protection from AC line shock. After the original service problem has been corrected, make a check of the fol­lowing:
FIRE AND SHOCK HAZARD
1. Be sure that all components are positioned to avoid a possibility of adjacent component shorts. This is especially important on items trans-ported to and from the repair shop.
2. Verify that all protective devices such as insulators, barriers, covers, shields, strain reliefs, power supply cords, and other hardware have been reinstalled per the original design. Be sure that the safety purpose of the polarized line plug has not been defeated.
3. Soldering must be inspected to discover possible cold solder joints, solder splashes, or sharp solder points. Be certain to remove all loose foreign par­ticles.
4. Check for physical evidence of damage or deterioration to parts and compo­nents, for frayed leads or damaged insulation (including the AC cord), and replace if necessary.
5. No lead or component should touch a high current device or a resistor rated at 1 watt or more. Lead tension around protruding metal surfaces must be avoided.
6. After reassembly of the set, always perform an AC leakage test on all exposed metallic parts of the cabinet (the channel selector knobs, antenna terminals, handle and screws) to be sure that set is safe to operate without danger of electrical shock. DO NOT USE A LINE ISOLATION TRANS­FORMER DURING THIS TEST. Use an AC 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 150V AC type capacitor between a known good earth ground water pipe, conduit, etc.) and the exposed metal­lic parts, one at a time. Measure the AC voltage across the combination of 1500 ohm resistor and .15 mfd capacitor. Reverse the AC plug by using a non-polarized adaptor and repeat AC voltage measurements for each exposed metallic part. Voltage measured must not exceed 0.75 volts RMS. This corresponds to 0.5 milliamp AC. Any value exceeding this limit consti­tutes a potential shock hazard and must be corrected immediately.
TIPS ON PROPER INSTALLATION
1. Never install any receiver in a closed-in recess, cubbyhole, or closely fitting shelf space over, or close to, a heat duct, or in the path of heated air flow.
2. Avoid conditions of high humidity such as: outdoor patio installations where dew is a factor, near steam radiators where steam leakage is a factor, etc.
3. Avoid placement where draperies may obstruct venting. The customer should also avoid the use of decorative scarves or other coverings that 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 tests on customized installations.
5. Caution customers against mounting a product on a sloping shelf or in a tilt­ed position, unless the receiver is properly secured.
6. A product on a roll-about cart should be stable in its mounting to the cart. Caution the customer on the hazards of trying to roll a cart with small cast­ers across thresholds or deep pile carpets.
7. Caution customers against using extension cords. Explain that a forest of extensions, sprouting from a single outlet, can lead to disastrous conse­quences to home and family.
PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS
A.C. Voltmeter
Good Earth Ground such as the Water Pipe, Conduit, etc.
0.15uF
1500 OHM
10 WATT
Place this probe on each exposed metal part.
1-3
SERVICING PRECAUTIONS
CAUTION: Before servicing the VCR + DVD RECODER 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.
Remember Safety First:
General Servicing Precautions
1. Always unplug the VCR + DVD RECODER AC power cord
from the AC power source before: (1) Removing or reinstalling any component, circuit board,
module, or any other assembly.
(2) Disconnecting 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
RECODER 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 RECODER
and / or any of its electrical assemblies unless all solid­state device heat sinks are correctly installed.
6. Always connect the test instrument ground lead to an
appropriate ground before connecting 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 include 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 grounded-tip soldering iron to solder or unsolder ES devices.
4. Use only an anti-static solder removal device. Some solder removal devices not classified as “anti-static” can generate electrical charges sufficient to damage ES devices.
5. Do not use freon-propelled chemicals. These can generate an electrical charge sufficient to damage ES devices.
6. Do not remove a replacement ES device from its protec­tive 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.)
BURNING DISC
• For up-dating the DVD program using the disc, it must burning the disc which include the DVD software.
• For recorder combi set which using the disc downloader program are DVD Program and Loader Program.
• In 2nd generation for recorder combi can download the DVD program and Loader program one by one, or all together.
• If you format like number 1 you’ll see capture like (figure 1)
• And you have three choice:
1. Main. It’s mean if you chose this it’ll up-dating only DVD prgram.
2. Loader.It’s mean if you chose this it’ll up-dating only Loader program.
3. ALL. It’s mean if you chose this it’ll up-dating DVD and Loader program.
• If you format like number 2 you’ll not see capture like figure 1 that give you choices, you have no choice only update DVD program
1-5
UP-DATING PROGRAM
* There is two way to format disc DVD Program
1. DVD and LOADER program format in one
disc
2. Only DVD program format in one disc
(Figure 1)
Number 1
Number 2
1-6
DVD UPGRADE INSTRUCTION
FORMAT NO 1
1. Press POWER KEY to turn on.
2. After booting, insert the upgrade disc, and you will see massage like [FIGURE 1]
3. Press “REC” key (front or remote) 3 times and you will see as [FIGURE 2] with remote Chose one of them
then Press enter
4. For update both of them [MAIN & LOADER] we chose “ALL” and first you will see [FIGURE 3] DVD update
Check the “Current Version” and “ New CD Write Version” and press “REC” key.
5. The DVD update will be on progress.And when finish update MAIN Version it’s automatically continue to
Update Loader Version and You will see [FIGURE 4] Check the “Current Version” and “New CD Write Version “ and Press “REC” key once more
6. The LOADER update will be on progress. And tray will open.
7. Remove the disc and wait until finish
8. The tray will be close and open automatically after completing “UNDER UPDATE” 100%
9. Turn off the unit
10. Turn on again the unit is operation with new software
FORMAT NO 2
1. Press POWER KEY to turn on.
2. After booting, insert the upgrade disc, and you will see massage like [FIGURE 1]
3. Press “REC” key (front or remote) 3 times
4. The DVD update will be on progress.
Check the “Current Version” and “New CD Write Version “ and Press “REC” key once more
5. The tray will be open automatically after completing “UNDER UPDATE” 100%
6. Remove the disc andTurn off the unit
7. Turn on again the unit is operation with new software
[FIGURE 1] [FIGURE 2] [FIGURE 3] [FIGURE 4]
[FIGURE 1] [FIGURE 2]
1-7
SPECIFICATIONS
General
Power requirements AC 200-240V, 50 Hz Power consumption 35W Dimensions (approx.) 430 X 78.5 X 354 mm (w x h x d) Mass (approx.) 5.7 kg Operating temperature 5°C to 35°C Operating humidity 5 % to 90 % Television system PAL B/G, PAL I/I, SECAM D/K colour system Recording format PAL
SYSREM
Laser Semiconductor laser, wavelength 650 nm Video head system Double azimuth 4 heads, helical scanning Signal system PAL
Recording
Recording format DVD VideoRecording, DVD-VIDEO Recordable discs DVD-ReWritable, DVD-Recordable, DVD+ReWritable, DVD+Recordable
DVD+Recordable (Double Layer)
Recordable time DVD (4.7GB) : Approx. 1 hour (XP mode), 2 hours (SP mode),
4 hours (LP mode), 6 hours (EP mode) DVD+R DL (8.5GB) : Approx. 1 hour 50 minutes (XP mode), 3 hours 40 minutes (SP mode), 7 hours 10 minutes (LP mode), 11 hours (EP mode)
Video recording format
Sampling frequency 27MHz
Compression format MPEG 2
Audio recording format
Sampling frequency 48kHz
Compression format Dolby Digital
Playback
Frequency response DVD (PCM 48 kHz): 8 Hz to 22 kHz, CD: 8 Hz to 20 kHz
DVD (PCM 96 kHz): 8 Hz to 44 kHz Signal-to-noise ratio More than 100 dB (AUDIO OUT connector) Harmonic distortion Less than 0.008% (AUDIO OUT connector) Dynamic range More than 95 dB (AUDIO OUT connector)
Inputs
AERIAL IN Aerial input, 75 ohms VIDEO IN 1.0 Vp-p 75 ohms, sync negative, RCA jack x 1 / SCART x 2 AUDIO IN 0 dBm more than 47 kohms, RCA jack (L, R) x 1 / SCART x 2 DV IN 4 pin (i.LINK/IEEE 1394 standard) S-VIDEO IN (Y) 1.0 V (p-p), 75 Ω, negative sync, Mini DIN 4-pin x 1
(C) 0.3 V (p-p) 75 Ω
Outputs
VIDEO OUT 1.0 Vp-p 75 ohms, sync negative, SCART x 2 S-VIDEO OUT (Y) 1.0 V (p-p), 75 Ω, negative sync, Mini DIN 4-pin x 1
(C) 0.3 V (p-p) 75 Ω COMPONENT VIDEO OUT (Y) 1.0 V (p-p), 75 Ω, negative sync, RCA jack x 1
(Pb)/(Pr) 0.7 V (p-p), 75 Ω, RCA jack x 2 Audio output (digital audio) 0.5 V (p-p), 75 Ω, RCA jack x 1 Audio output (optical audio) 3 V (p-p), 75 Ω, Optical connector x 1 Audio output (analog audio) 2.0 Vrms (1 KHz, 0 dB), 600 Ω, RCA jack (L, R) x 1 / SCART
• Design and specifications are subject to change without notice.
• Manufactured under license from Dolby Laboratories. “Dolby” and the double-D symbol are trademarks of Dolby
Laboratories.
• DTS and DTS Digital Out are registered trademarks of Digital Theater Systems, Inc.
2-1
SECTION 2
EXPLODED VIEWS
CONTENTS
EXPLODED VIEWS .....................................................................................................................2-2
1. Cabinet and Main Frame Section ...........................................................................................2-2
2. Deck Mechanism Section (RL-05) ..........................................................................................2-3
3. Packing Accessory Section ....................................................................................................2-4
2-2
EXPLODED VIEWS
1. Cabinet and Main Frame Section
463
463
250
469
A47
463
255
256
257
470
300
OPTIONAL PART
A46
469
321
323
469
276
457
278
457
A50
457
286
A60
285
469
469
A52
283
A54
284
274
457
A48
468
266
264
263
260
A00
265
465
261
320
261
261
452
A43
A44
280
2-3
2. Deck Mechanism Section (RL-05)
1434
1026
1435
1015
1005
1016
1001
1003
1013
1014
A001
1002
1
434
1012
1019
1011
1009
1038
1024
1432
1029
1019
1025
1027
1020
1433
1437
1029
1432
1033
1021
A60
A000
1030
1025
1027
1432
1032
1432
1017
A004
1436
1018
1018A
1018B
1018C
1018E
1018D
1042
1434
1006
1041
A002
1434
2-4
3. Packing Accessory Section
810
808
BATTERY
900
REMOCON
826
FILTER
803
P
ACKING
CABLE ASS'Y
RF
OPTIONAL PARTS
806
CABLE(COAXIAL)
811
PLUG ASS'Y 1WAY
812
PLUG ASS'Y 2WAY
821
SCART CABLE
INSTRUCTION ASSEMBLY
801
803
804
ACKING
P
BAG
802
BOX CARTO
N
3-1
SECTION 3
ELECTRICAL
CONTENTS
OVERALL WIRING DIAGRAM..............................3-2
VCR PART
ELECTRICAL ADJUSTMENT PROCEDURES
............................................................3-3
VCR ELECTRICAL TROUBLESHOOTING GUIDE
.............................................................................3-4
1. POWER(SMPS) CIRCUIT .......................................3-4
2. SYSTEM/KEY CIRCUIT ..........................................3-7
3. SERVO CIRCUIT.....................................................3-8
4. Y/C CIRCUIT..........................................................3-11
5. HI-FI CIRCUIT .......................................................3-15
6. TUNER/IF CIRCUIT...............................................3-18
BLOCK DIAGRAMS................................................3-20
1. POWER(SMPS) BLOCK DIAGRAM......................3-20
2. TUNER/MTZ BLOCK DIAGRAM ...........................3-22
3. VPS BLOCK DIAGRAM ........................................3-23
4. Y/C BLOCK DIAGRAM ..........................................3-24
5. HI-FI BLOCK DIAGRAM........................................3-26
6. SYSTEM BLOCK DIAGRAM.................................3-28
7. SCART & SWICH BLOCK DIAGRAM ...................3-30
CIRCUIT DIAGRAMS..............................................3-32
1. POWER(SMPS) CIRCUIT DIAGRAM ...................3-32
2. TU/IF CIRCUIT DIAGRAM ....................................3-34
3. A/V CIRCUIT DIAGRAM........................................3-36
4. HI-FI CIRCUIT DIAGRAM .....................................3-38
5. SYSTEM CIRCUIT DIAGRAM...............................3-40
6. SCART(JACK) CIRCUIT DIAGRAM
(SCART MODEL ONLY).........................................3-42
7. TIMER CIRCUIT DIAGRAM( 2 TOOL ).................3-44
8. TIMER CIRCUIT DIAGRAM( 3 TOOL, 8 TOOL ) ..3-46
9. TIMER CIRCUIT DIAGRAM( 4 TOOL ).................3-48
10. TIMER CIRCUIT DIAGRAM( 6 TOOL )...............3-50
11. TIMER CIRCUIT DIAGRAM( 7 TOOL ) ...............5-52
• WAVEFORMS .........................................................3-54
• CIRCUIT VOLTAGE CHART ...................................3-56
PRINTED CIRCUIT DIAGRAMS .........................3-60
1. VCR P.C.BOARD(TOP VIEW)...............................3-60
2. VCR P.C.BOARD(BOTTOM VIEW).......................3-62
3. SMPS P.C.BOARD ................................................3-64
4. JACK P.C.BOARD .................................................3-66
5. KEY P.C.BOARD ...................................................3-68
6. TIMER P.C.BOARD ...............................................3-68
VDR PART
VDR ELECTRICAL TROUBLESHOOTING GUIDE
...........................................................................3-70
1. POWER(SMPS) CIRCUIT .....................................3-70
2. NO COMPONENT VIDEO SIGNAL WHEN
PLAYING DISC......................................................3-72
3. NO COMPOSITE / S-VIDEO SIGNAL WHEN
PLAYING DISC......................................................3-73
4. NO TV, EXTERNAL INPUT VIDEO SIGNAL.........3-74
5. WHEN PLAYING DISC, NO AUDIO OUTPUT ......3-75
6. NO TUNER AUDIO OUTPUT ................................3-75
7. NO OPTICAL / DIGITAL OUTPUT ........................3-75
8. NO EXTERNAL INPUT 1, 2 AUDIO ......................3-76
9. NO EXTERNAL INPUT 3 AUDIO ..........................3-76
BLOCK DIAGRAMS................................................3-77
1. VDR SET TOTAL BLOCK DIAGRAM....................3-77
2. VDR MAIN H/ W BLOCK DIAGRAM .....................3-78
3. POWER BLOCK DIAGRAM ..................................3-79
4. AUDIO IN/ OUT BLOCK DIAGRAM ......................3-80
5. CPU & CONTROL REGISTER
BLOCK DIAGRAM.................................................3-81
6. VIDEO IN/ OUT BLOCK DIAGRAM ......................3-82
7. DV 1394 IN/OUT BLOCK DIAGRAM ....................3-83
8. MEMORY CARD IN/ OUT BLOCK DIAGRAM ......3-84
CIRCUIT DIAGRAMS..............................................3-85
1. BGA 308P CIRCUIT DIAGRAM.............................3-85
2. DDR & B TO B CONNECTOR
CIRCUIT DIAGRAM ..............................................3-87
3. POWER, FLASH, CONNECTOR CIRCUIT
DIAGRAM ..............................................................3-89
4. RST, CONTROL/STATUS_REG., ATAPI,
HOST_CPLD, LATCH CIRCUIT DIAGRAM ..........3-91
5. VIDEO_IN, VIDEO_OUT CIRCUIT DIAGRAM......3-93
6. DV1394, HDMI CIRCUIT DIAGRAM .....................3-95
7. AUDIO IN/OUT CIRCUIT DIAGRAM .....................3-97
• WAVEFORMS .........................................................3-99
• CIRCUIT VOLTAGE CHART .................................3-101
PRINTED CIRCUIT DIAGRAMS .......................3-103
1. VDR P.C.BOARD(TOP VIEW).............................3-103
2. VDR P.C.BOARD(BOTTOM VIEW) .....................3-115
3-2
OVERALL WIRING DIAGRAMS
1514131211
10
987654321
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
SPD.F
GND
INTR/PROG
NC
GND
RADIO'H'
AMP ON
VDR REDET
NC
NC
NC
VDR CLK
DATA(VCR-VDR)
DATA(VDR-VCR)
VDR ENA
AMP CLK
AMP RX
AMP TX
AMP READY
AMP MUTE
NC
1514131211
10
987654321
P6603
P6602
PM601PN302
PN302
PN301
PN301
PMD01PMD02
PN304
CON401
CON401
PPM01
P101
P3D01P3D03
P104
P103
P103
P104
P3D02
P3D02
PMC01
PMC01
P3D03
P3D01
PN303
PM602
PM603 P6M01
13.5VA(DRUM)
A/E(-)
A/E(+)
CFG
CAP.VCC
SERVO VCC
CAP.REV'H'
I-LIMIT
MOTOR GND
S.GND
DRUM VCC(13.5VA)
CAP.CTL
L/M CTL
DPG/DFG
DRUM CTL
8.7V
GND12
1
2
R493
3-3
ELECTRICAL ADJUSTMENT PROCEDURES
1. Servo Adjustment
1) PG Adjustment
• Adjustment And Specification
• Test Equipment a) OSCILLOSCOPE : PAL SP TEST TAPE
MODE
PLAY
• Adjustment Procedure
a) Insert the SP Test Tape and play. b) Connect the CH1 of the oscilloscope to the H/SW and CH2 to the “VCR VIDEO” TP for the VCR. c) Trigger the mixed Combo Video Signal of CH2 to the CH1 H/SW, and then check the distance (time dif-
ference), which is from the selected A(B) Head point of the H/SW signal to the starting point of the ver­tical synchronized signal, to 6.5H ± 0.5H (416µs, 1H=64µs).
• PG Adjustment Method
a-1) Playback the SP standard tape b-2) Wait for 3seconds with F/P “REC” key and “PLAY” key presseed at the same time. < Digitron[ - - ] > c-3) Repeat the above step(No.b-2), then it finishes the PG adjusting automatically. < Digitron[ PG ] > d-4) Stop the playback, then it goes out of PG adjusting mode after mony the PG data.
• CONNECTION
• WAVEFORM
V.Out
H/SW(TP)
R/C TRK JIG KEY 6.5 ± 0.5H
MEASUREMENT POINT ADJUSTMENT POINT SPECIFICATION
H/SW
(TP)
TP
(VCR
VIDEO)
(CH2)
(CH1)
OSCILLOSCOPE
CH1 CH2
R/C KEY
H/SW
(TP)
VCR BOARDVDR BOARD
"VCR VIDEO" TP
VCR PART
H/SW
Composite
VIDEO
6.5H(416µs)
3-4
VCR ELECTRICAL TROUBLESHOOTING GUIDE
1. Power(SMPS) CIRCUIT
NO 5.3VA.
Replace the F101 (Use the same Fuse)
Is the F101 normal?
Is the TH01 Normal?
Is the BD101 Normal?
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
Replace the BD101
Replace the TH01
Is the D102 normal?
Check or Replace the D102
Replace the D121
Replace the IC103
Replace the D126
Replace the D129
Replace the D130
Replace the D127
Replace the D128
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
Is the Vcc (11V - 18V) supplied to IC101 Pin2?
NO
Is the D121 normal?
Is there about 2.5V at the IC103 Pin1?
Is the D126 normal?
Is the D129 normal?
Is the D130 normal?
Is the D127 normal?
Is the D128 normal?
YES
Power Line of Main PCB(VCR) is short
3-5
VCR ELECTRICAL TROUBLESHOOTING GUIDE
No 12VA
Check or Replace the D126
Is the Vcc(13V) supplied to C130?
Check or Replace the Cap / Drum
Is the D132 Normal?
NO
NO
Replace the D132
YES
YES
(To Cap, Drum Motor )
No REG 12V
Check or Replace the D126
Check the ‘PWR CTL “H”’signal from µ-com
Check the 33V Line
Replace the Q126
Is the Vcc(13V) sup­plied to Q126Collector?
Is the Vcc(33V) sup­plied to Q126 Base?
Is the Q126 Nomal?
Check or Replace the D126
NO
NO
NO
YES
YES
YES
NO VFD
Check or Replace the R107
Is the R107 Normal?
Is the D128 Normal?
NO
Check or Replace the D128
Check or Replace the ZD151
NO
NO
YES
Is the ZD151 Normal?
Check or Replace the D127
YES
YES
No 33V
Check or Replace the D130
Is the Vcc(33V) sup­plied to Q123 Emittor?
Is the Q123 Base ‘H’?
NO
Check the ‘PWR CTL “H”’signal from µ-com
NO
YES
Check or Replace the Q123
YES
3-6
VCR ELECTRICAL TROUBLESHOOTING GUIDE
No 28V (HSR)
Check or Replace the D129
Is the Vcc(30V) supplied to Q120 Collector?
Is the Vcc(33V) supplied to Q121 Collector?
Is the Vcc(30V) sup­plied to Q120 Base?
NO
NO
Check or Replace the ZD153
NO
Check the ‘HSR “H” signal from µ-com
Check or Replace the Q121/Q122 & 33V line
YES
YES
Check or Replace the Q120
YES
3-7
2. SYSTEM/KEY CIRCUIT
(1) AUTO STOP
(2) The unstable loading of a Cassette tape
Auto Stop
Does the H/SW waveform appear at IC501 Pin23?
Do the T-UP Reel Pulses appear at IC501 Pin3?
Is 12V applied to PMC01 Pin8?
Check the Drum Motor signal.
Does 5.0V appear at the RS501?
Check the Power Circuit.
Check the power.
Is 5.0V applied to the
R544 ?
Refer to SMPS 5.3VA troubleshooting.
Check IC501 Pins86, 87, 88, 89.
Do T/UP Reel Pulses appear at the Q514 Base terminal?
Replace the T/UP Reel Sensor (RS501).
Check the CST SW and the peripheral circuitry.
Replace the IC501.
The unstable loading of a Cassette tape
Does the “H” signal appear at IC501 Pin32 during inserting the CST ?
Does the “L” signal appear at IC501 Pin19 while inserting the CST?
Check the Deck Mechanism.
Note :
Auto stop can occur because Grease or Oil has dried up
YES
YES
NO
YES
YES
YES
NO
NO
NO
NO
NO
NO NO
YES
YES YES
VCR ELECTRICAL TROUBLESHOOTING GUIDE
3-8
3. SERVO CIRCUIT
(1) Unstable Video in PB MODE
Does the Noise level of the screen change periodically?
Do the CTL pulses appear at IC501 Pin8?
Is adjusting the height of
the CTL Head accurate?
Readjust the height of the CTL Head.
Replace the IC501.
Refer to “When the Y signal doesn’t appear on the screen in PB Mode”.
Does the CFG waveform appear at the IC501 pin9?
On tracking, do the CTL pulses move?
Does the Video Envelope waveform appear at IC501 Pin24?
Replace IC501.
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 Cap M.
Aren’t the foil patterns and the Components between IC501 Pin 104 and PMC01 Pin11 shorted?
Replace the IC501.
Refer to “(2) No 12VA of Power section”
Do the Drum PWM Pulses appear at IC501 Pin107?
Aren’t the foil patterns and
the Components between IC501 Pin107 and PMC01 Pin12 shorted?
Do the DFG Pulses appear
at IC501 Pin104?
Do the Drum PWM Pulses appear at IC501 Pin107?
Are the connecting patterns and the Components
between IC501 Pin107 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
VCR ELECTRICAL TROUBLESHOOTING GUIDE
3-9
Does the CFG signal appear at PMC01 Pin1?
Does the PWM signal appear at IC501 Pin108?
Does 2.8V appear at PMC01?
Check the PMC01 and the Capstan Motor Ass’y.
Does the Capstan PWM signal appear at IC501 Pin108?
Aren’t the foil patterns and Components between IC501 Pin108 and PMC01 Pin9 short?
Does the CFG signal come into IC501 Pin9?
Aren’t the foil patterns and Components between IC501 Pin108 and PMC01 Pin9 short?
2. SERVO CIRCUIT
(3) When the Capstan Motor doesn’t run,
NO
NO
NO
YES
YES
YES
When the Capstan Motor doesn’t run,
Does 12VA appear at PMC01?
YES
Replace the IC501.
YES
NO
NO
YES
Refer to “SMPS(CAPSTAN/12Volt)
Trouble Shooting”.
Aren’t the foil patterns and component
between IC501 Pin87 and PMC01 Pin1 shorted?
Check the Capstan Motor Ass’y.
NO
VCR ELECTRICAL TROUBLESHOOTING GUIDE
3-10
Keys do not work
Is 5V applied to IC501 Pin36?
Does 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) Keys do not work
VCR ELECTRICAL TROUBLESHOOTING GUIDE
3-11
4. Y/C CIRCUIT
(1) No Video in EE Mode,
No Video in EE Mode
Does the Video signal appear at IC301 Pin15?
Check the IC802 Pin28
Is REG 5.0V applied to IC301Pins4, 22, 41, 47, 50, 52, 60, 84, 92?
Does the Video signal appear at IC301 Pin29?
Does the Video signal appear at the PMD02 Pin7?
Does the Video signal appear at the PMD02 Pin5?
Check the 5.0V, 5.3VA Line. (Power Circuit)
Is I2C BUS signal applied to the IC301 Pins73, 74?
Check C327. (AGC)
Replace IC301.
Check the Video Buffer Q905.
Check the DVD Board Video path.
Check the System Circuit. (Refer to ‘SYSTEM I2C BUS CHECK Trouble Shooting’)
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
Does the Video signal appear at the IC802 Pin29?
IC802 Pins2, 4(Vcc), Pins32, 33(I
2
C BUS)
YES
NO
NO
Does the Video signal appear at the IC901 Pin23?
Does the 12VT, 5.3VA appear at the IC901 Pin3, 4.
Check the 12V, 5.4VA Line. (Power Circuit)
Replace IC901.
YES
NO
NO
VCR ELECTRICAL TROUBLESHOOTING GUIDE
3-12
3. Y/C CIRCUIT
(2) When the Y(Luminance) signal doesn’t appear on the screen in PB Mode,
Is 5.0V 5.3VA applied to IC301 Pins22, 41, 47, 50, 52, 60, 84?
Is I2C BUS signal applied to the IC301 Pins73, 74?
Does the normal RF signal appear at IC301 Pin76?
Check the line of the 5.0V
5.3V Line. (Power Circuit)
Check the System Circuit. (IC501 Pin23)
Check the V.H.S/W level.
(Check R303, R304)
Refer to ‘SYSTEM I2C BUS CHECK Trouble Shooting’.
Is the V.H.S/W signal applied to IC301 Pin80?
Is the V.H.S/W “H” about
3.4V at the IC301 Pin80?
Clean the Drum.
Check the path of the Y(Luminace) RF signal. (Check the C327)
Check the path of the Y(Luminace) RF signal. (Check the C312)
Does the Y(Luminance) RF signal appear at IC301 Pin79?
Is the Y(Luminance) Video waveform showed up at IC301 Pin43?
Replace IC301.
NO
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
Replace the IC301.
NO
VCR ELECTRICAL TROUBLESHOOTING GUIDE
3-13
3. Y/C CIRCUIT
(3) When the C(Color) signal doesn’t appear on the screen in PB Mode,
Is 5.0V 5.3VA applied to the
IC301 Pins24, 42, 55, 72, 81.
Does the Color signal appear at IC301 Pin25?
Check the line of the 5.0V
5.3VA Line. (Power Circuit)
Replace the X301.
Check the Color Pass.
Does the X301 (4.43MHz) osxillate?
Replace the IC301.
Does the Color signal appear at IC301 Pin48?
Replace the IC301.
NO
YES
Is the Color Rotary signal applied to the IC301 Pin70?
Check the Color Rotary Circuit. (IC501 Pin98)
NO
YES
Is Color Rotary “H” about
3.4V?
NO
Check the Color Rotary level. (Check the R303)
YES
YES
YES
NO
NO
NO
VCR ELECTRICAL TROUBLESHOOTING GUIDE
3-14
3. Y/C CIRCUIT
(4) When the Video signal doesn’t appear on the screen in REC Mode,
VCR ELECTRICAL TROUBLESHOOTING GUIDE
Is the EE signal normal?
Does the RF signal appear at the IC301 Pin76?
Check EE Mode.
Check the System of REC ‘H’.(the IC501 Pin27 / the D301)
Replace the IC301.
Is the REC ‘H’ signal (about 4V) applied to the IC301 Pin80?
Check the circuit of the
IC301 Pin85, 86.
Check REC Luminace pass & Color pass.
Does the REC RF signal appear at the IC301 Pins88, 89, 94, 95?
NO
YES
Is 5.0V 5.3VA applied to the IC301 Pins22, 41, 47, 50, 52, 60, 84?
Check the line of the 5.0V
5.3VA line. (Power Circuit)
NO
YES
Does PB Mode operate nomally?
NO
Check PB Mode.
YES
Check the Drum & Drum
Connector
YES
YES
YES
NO
NO
NO
NO
3-15
VCR ELECTRICAL TROUBLESHOOTING GUIDE
5. Hi-Fi CIRCUIT
(1) No Sound(EE Mode)
YES
No Sound.
Check the AV1 Audio of IC801 Pins6, 7.
Check the AV2 Audio of IC801 Pins8, 9.
Check the AV3 Audio of IC801 Pins10, 11.
Check the Vcc of IC801 Pins34, 40, IC802 Pins2, 4.
YES
Check the IIC Clock and DATA at IC801 Pins42, 43.
YES
YES
Check the Audio of IC801 Pins16, 17.
Check the SC901, JK901.
Check the Scart1 Jack. (SC901 Scart1 Audio in Pin2, 6).
NO
NO
Check the Scart2 Jack. (SC901 Scart2 Audio in Pin2, 6).
NO
Check the front Jack.
Check the Power 5.0V, 12V.
YES
NO
Check the IC501 Pins59, 60.
NO
Replace IC801.
NO
Check the Audio of PMD02 Pin19, 21.
Check the Pcb Pattern between IC801
Pin16, 17 with PMD02 Pin19, 21.
NO
YES
YES
Check the Audio of PMD02 Pin23, 25. Check the DVD Board Audio path.
NO
Check the TU Audio of IC801 Pins2, 3.
Check the IC751 Pin30, 31.
NO
Check the DVD Audio of IC801 Pins4, 5.
Check the DVD Audio OUT. (JK902 DVD_A_L_L/R).
NO
3-16
VCR ELECTRICAL TROUBLESHOOTING GUIDE
3. Y/C CIRCUIT
(2) Hi-Fi Playback
YES
YES
YES
YES
PB mode
No Sound.
Check the Vcc of IC801 (Pins34, 40)
Check the Hi-Fi Selection switch. (IC801 Pin41) and the Tape quality.
Is the RF Envelope at IC801 Pin44 over 2Vp-p?
YES
Check IC801 Pin42(Data), Pin43(Clock)
YES
Do Audio Signals appear at IC801 Pin16(L-CH), 17(R-CH)?
YES
Do Audio Signals appear at IC802 Pin25(L-CH), 21(R-CH)?
YES
Do Audio Signals appear at JK901, SC901?
YES
Check the IC802 Pins6, 12
Check Power 5.0V, 12V.
NO
Check IC501 Pin26 (A.H/SW)
NO
NO
Check the parts of µ-COM (IC501 Pins17, 18)
NO
Check the Connection at P3D01 Pins7, 9.
NO
Check the Audio PMD02 Pin23, 25.
NO
Check the Jack(JK901, SC901)
NO
Check the DVD Board Audio Path
NO
3-17
(3)
Hi-Fi REC.
It can’t be recorded Hi-Fi Audio signal.
Check Vcc of IC801. (Pins34. 40)
YES
YES
Check IC801 Pin42(Data), Pin43(CLOCK).
YES
Do Audio signals appear at IC801 Pins16, 17?
YES
Do FM Audio signals appear at IC801 Pin36?
YES
Check the Contact Point of Drum Connector if good then Replace the Drum.
YES
Check Power 5V, 12V.
NO
Check ports of µ-COM. (IC501 pins 17, 18)
Check Audio input signal of IC801 Pins2, 3(TU.A.), 4, 5(DVD.A.), 6, 7(AV2.A.), 10, 11(AV3.A).
NO
Replace IC801.
NO
NO
VCR ELECTRICAL TROUBLESHOOTING GUIDE
3-18
6. Tuner/IF CIRCUIT
(1) No Picture on the TV screen
No picture on the TV screen
Does the Video signal appear at TU701 Pin19.
YES
Is 33V applied to TU701 Pin17?
Is +5V applied to TU701 Pin4?
NO
Does the video signal at the PMD02 Pin5?
NO
NO
NO
Does the Video signal at the IC802 Pin 29.
Does the Video signal at the IC901 Pin 23.
Check 33V line.
NO
NO
NO
Check 5V line.
Does the Clock signal appear at TU701 Pin12?
Check the llC Clock Signal of µ-COM Pin18.
Does the data signal appear at TU701 Pin13?
Replace Tuner.
Check the DVD Board Video Path.
Replace the IC802.
Replace the IC901.
Does the video signal appear at IC802 Pin28.
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
Check the Pattern between IC901 Pin23 with SC901 Pin19
Does the Video signal at the IC802 Pin31.
Check the Pattern between TU701 Pin19 and IC802 Pin28.
Replace the IC802.
NO
YES
Does the Video signal at the IC301 Pin15.
Check the Pattern between IC802 Pin31 and IC301 Pin15.
NO
YES
Does the Video signal at the IC301 Pin29.
Replace the IC301.
Check the llC Data Signal of µ-COM Pin17.
VCR ELECTRICAL TROUBLESHOOTING GUIDE
3-19
VCR ELECTRICAL TROUBLESHOOTING GUIDE
(B) No Sound
No Sound.
Check the Vcc of IC751 Pins1, 11, 19, 22, 33.
YES
Check 5.2V Line.
NO
Check the Tuner SiF signal at IC751 Pin2.
YES
Check the oscillator of IC751 Pins5, 6.
YES
Check the Audio of IC751 Pins30, 31.
YES
Check the Audio of IC801 Pins2, 3.
YES
Check the Audio of IC801 Pins16, 17.
YES
YES
Check the Tuner SIF of TU701 Pin16.
NO
Replace X751
NO
Check the IIC Clock and Data at IC751 Pins12, 13.
NO
Check the signal flow from IC751 Pins30, 31 to IC801 Pins2, 3.
NO
Check the IIC Clock and Data at IC801 Pins42, 43.
NO
Check the Audio of IC802 Pins21, 25.
Check the Signal flow from IC802 pins21, 25 SC901 Pins1, 3.
YES
Check the DVD Board Audio Path.
NO
3-20 3-21
BLOCK DIAGRAMS
1. POWER(SMPS) BLOCK DIAGRAM
BD
101
!
NOISE FILTER
BLOCK (C101,L102, L101, C102)
!
FUSE (F101)
BR BL
(BK)(WH)
!
Y-CAP C110
TH01
C103
!
+
Y-CAP
111
C
SNUBBER
BLOCK (D101,C105 C106,R103)
5 6 7 8
DRIVE & S/W BLOCK
(IC101, D102, R105,
C108,C1
SNUBBER
BLOCK
(D103,C115,C116
,R112,R115)
6 7 8
DRIVE & S/W BLOCK
5
(IC104, D104, R113,
C117,C114)
1
!
T101
12)
3
3
2
!
PHOTO COUPLER
C102)
(I
102
T
!
2
!
PHOTO COUPLER
(IC105)
RECTIFIER &
SMOOTING BLOCK
(D128,C133,R130)
RECTIFIER &
SMOOTING BLOCK
(D126,C136,L122,C1
RECTIFIER &
SMOOTING BLOCK
(D129,C128,R147)
RECTIFIER &
SMOOTING BLOCK
(D130,C137,R146)
RECTIFIER &
SMOOTING BLOCK
(D121,C122,L121,C124)
ERROR AMP
(IC103)
RECTIFIER &
SMOOTING BLOCK
(D125,C139,L127,C140)
RECTIFIER &
SMOOTING BLOCK
(D124,C129)
RECTIFIER &
SMOOTING BLOCK
(D123,C126,L124,C127)
RECTIFIER &
SMOOTING BLOCK
(D122,C123,L123,C1
ERROR AMP
(IC106)
30)
FEED-BACK
BLOCK R121,R122, C121,R123.
R124.R125
R126)
FEED-BACK
BLOCK R131,R132, C141,R133.
R161.R162
R163)
RECTIFIER &
SMOOTING BLOCK
(D127,C131,L125,C132)
HSR S/W B l ock
(Q120,ZD153,C135,
R144,R145,D155,C157)
12V REG & S/W Block
(Q126,R150,ZD152,
C156,C153)
33V S/W B l oc k
(Q123,R143,R13
(Q124,R140,R135,R136
(Q121,Q122,R141)
(Q125,R137,R13
12V REG & S/W Block
(IC157,R156,C155)
5.0V REG & S/W Block (IC151,R151,C151)
1.8V REG & S/W Block (IC160,R159,C152)
25)
3.3V REG & S/W Block (IC154,R154,C154)
4)
5.0V S/W B l ock D134,C134
HSR CTL Block
PWR CTL Block
)
8)
TO VCR
(P101)
5.3VA
5.0V
Cap Vc
c
REG 12V
33V
12VA( DRUM)
PWR C TL 'H'
HSR 'H'
DVD PWR CTL
FD(-) FD(+)
-28VA
TO FAN
(P103)
8.7V
TO VDR
(P102)
-12V 12V
1.8V
2.5V
3.3V
5.0V
TO LOADER
(P103)
12V
5.0V
VCR+DVD REC SCART+RCA
3-22 3-23
2. TU/IF, NICAM & A2 BLOCK DIAGRAM 3. VPS BLOCK DIAGRAM
SW1
SW2
151 5.4VA
871
159
872
S.V.W
(From Power)
94
93
59
60
AS
158
A.OUT
AFT
SIF
MSP3417
MSP3407
27
159
731
VCR+DVD REC SCART+RCA
3-24 3-25
4. Y/C BLOCK DIAGRAM
IIC DATA
IIC CLK
IC501
NJM2274
SUPER 'C'
SUPER 'Y'
S/W
VIDEO
AV3
VIDEO
DVD
CVBS
MIXED
Y/C
15PIN
17PIN
19PIN
21PIN
IC301
AVCP
29PIN
82PIN
77PIN
2V
BUFFER 2V
MICOM
VIDEO
SEC/MES DET ëHí
SEC.REC.COLOR
IIC CLK
IC802
MM1443
CANAL
1V
AVCP
VIDEO
IC501
MICOM
DVD
VIDEO
SYSTEM
IC302
LA70100
SECAM
IIC DATA
TU AV1
AV2
DVD CVBS
FRONT
I/O
JACK
IC901
MM1623
6dB AMP
JC901
SACRT
JACK
V.OUT
3-26 3-27
5. Hi-Fi BLOCK DIAGRAM
CANNAL IC
AV1 out
AV
DVD AUDIO
ADC
MPEG
DAC
VCR Audio
VCR
Hi-Fi
AV1 IN
TUNER AUDIO
AV3 IN
AV2 in/out
SCART1
Tuner
Front
Jack
SCART2
RF
TV
RCA
DECODER
BOX
3-28 3-29
6. SYSTEM BLOCK DIAGRAM
TO/FROM AVCP
TO/FROM DECK
TO/FROM AUDIO(Hi-Fi)
TO/ FROM TU/IF
FROM TO SCART/SWITCH
COM
5V
TO/FROM DECK
MODE S/W
T-UP END
ES501
LD501 DECK IR LED
RS501
T-UP REEL
SUP REEL
MS501
To/FROM DVD
SUP END
RS502
5.3VA
GND MODE S1 MODE S2 MODE S3 MODE S4
ES502
R564
X502
32.768KHz
X501
14MHz
OSC
OSC
34
74
CTL +
CAP. PWM
DRUM PWM
75
33
20
I-Limit
89
MODE S1
88
MODE S2
87
MODE S3
86
MODE S4
10
VDR ENA
12
VDR DATA
13
VCR DATA
11
VDR CLK
38
X in
37
X out
Xc in
40
Xc out
41
6
T-UP Sensor
85
SUP Sensor
C535
3
T-UP Reel
2
Sup Reel
21 19
67
65
CFG
CTL -
DPFG
IC501
MN01D10X
LD CTL
CAP. REV 'H'
82
23
24
V. ENV
D.V.Sync
V.H.SW30
SECAM DET 'H'
TU. SECAM VL 'H'
99
H.A.SW
REC 'H'
C.ROT
FLD DATA
FLD ENA
FLD CLK
V. MUTE 'L'
RGB OUT 'H'
RGB SW 'H'
AV3 'H'
Super Det 'H'
Others 'L' Ct Det 'H'
SCART 'H'
16:9 'H'
VCR 'H'
A. ENV
A. H.SW
A. MUTE 'H'
REC 'H'
IIC CLK
IIC DATA
AFT
IIC CLK
IIC DATA
DAV 'L'
Tu. SECAM 'H'
POWER FAIL
49 100
27 98 84
16 28 14
62 59
94 60
61
7
57 96
97
8
83 26 58
27 18
17
81 18
17 93
63 64
4
CV IN COMP IN
TO/FROM AVCP
DIG601
DISPLAY
IC601
FROM TO SCART/SWITCH
µ – COM
TO/FROM AUDIO(Hi-Fi)
TO/ FROM TU/IF
5.3VA
CST.SW/REC TAP
CS501
CST IN S/W
32
14
R/C
RC601
Vcc (OSD)
A. Vcc (servo, A/D)
51
73
25
Vcc
(SYSCON)
RESET
36
+ +
C500 C501
IC504
3
Q503
Q501
+
+
L504
5.3VA
IC505
3
5V
Vcc
Vcc
GND
2
1
GND
2
1
VCR+DVD REC SCART+RCA
3-30 3-31
7. SCART & SWICH BLOCK DIAGRAM
AVCP
Mixed
Y/C
DVD
(CVBS)
Dvd_CVBS
Tuner
AV1
super
S/W video
CANAL
TU
AV1
AV1
AV2
CVBS
VPS
REC/PB
BLOCK
AV2
JACK
DECODER
RGBYC
6dB
Amp
&
75
Drive
DECODER
BOX
ADC
R
G
B
MPEG
RG B
Y C
CVBS
Slide Switch
RGB_S/W'H'
C+DET'H'
MODULATOR
AV1
JACK
RCA SCART
RCA SCART
RCA SCART
Scart
'H'
VCR
MICOM
RGB_OUT'H'
CPLD
S/W
BLOCK
DAC
ENCODER
TV
SET
Scart 8Pin
16:9 'H'
S/W
BLOCK
CVBS
Y C
Scart 16Pin
3-32 3-33
NOTES) Symbol denotes AC ground.
NOTES) Symbol denotes DC chassis ground.
NOTE) Warning
NOTE) Parts that are shaded are critical NOTE) With respect to risk of fire or NOTE) electricial shock.
A B C D E F G H I J K L M N O P Q R ST
CIRCUIT DIAGRAMS
1. POWER(SMPS) CIRCUIT DIAGRAM
IMPORTANT SAFETY NOTICE
WHEN SERVICING THIS CHASSIS, UNDER NO CIR­CUMSTANCES SHOULD THE ORIGINAL DESIGN BE MODIFIED OR ALTERED WITHOUT PERMISSION FROM THE LG ELECTRONICS CORPORATION. ALL COMPONENTS SHOULD BE REPLACED ONLY WITH TYPES IDENTICAL TO THOSE IN THE ORIGINAL CIR-
CUIT. SPECIAL COMPONENTS ARE SHADED ON THE SCHEMATIC FOR EASY IDENTIFICATION.
THIS CIRCUIT DIAGRAM MAY OCCASIONALLY DIF­FER FROM THE ACTUAL CIRCUIT USED. THIS WAY, IMPLEMENTATION OF THE LATEST SAFETY AND PERFORMANCE IMPROVEMENT CHANGES INTO THE SET IS NOT DELAYED UNTIL THE NEW SERVICE LITERATURE IS PRINTED.
NOTE :
1. Shaded( ) parts are critical for safety. Replace only with specified part number.
2. Voltages are DC-measured with a digital voltmeter during Play mode.
S/W Error IC101,IC104 is Defective
Switching Error IC105, IC106 are Defective
3. 3V No Power D122 is Defective
28V No Power D129 is Defective
12V No Power D126 is Defective
5. 3VA No Power D121 is Defective
No Power D102 is Defective
No Power F101 is Defective
12V No Power IC157 is Defective
5V No Power IC151 is Defective
1.8V No Power IC160 is Defective
3.3V No Power IC154 is Defective
Switching Error IC105,IC106 are Defective
30VA No Power D130 is Defective
No Power BD101, TH01 is Defective
-29VA No Power D127 is Defective
28V No Power Q120 or ZD153 are Defective
12V No Power Q125 or ZD152 are Defective
2. 5V No Power IC152 is Defective
12V No Power D125 is Defective
No Power D104 is Defective
5V No Power D124 is Defective
1.8V No Power D123 is Defective
No Digitron Displayed
D128,R107,ZD151 are Defective
3-34 3-35
A B C D E F G H I J K L M N O P Q R ST
2. TUNER CIRCUIT DIAGRAM
3-36 3-37
A B C D E F G H I J K L M N O P Q R ST
3. A/V CIRCUIT DIAGRAM
3-38 3-39
A B C D E F G H I J K L M N O P Q R ST
4. Hi-Fi CIRCUIT DIAGRAM
3-40 3-41
WAVEFORM
1
2
7
4
3
6
5
A B C D E F G H I J K L M N O P Q R ST
5. SYSTEM CIRCUIT DIAGRAM
3-42 3-43
A B C D E F G H I J K L M N O P Q R ST
6. SCART CIRCUIT DIAGRAM (SCART MODEL ONLY)
3-44 3-45
A B C D E F G H I J K L M N O P Q R ST
7. TIMER CIRCUIT DIAGRAM( 2 TOOL )
3-46 3-47
8. TIMER CIRCUIT DIAGRAM( 3 TOOL, 8 TOOL )
A B C D E F G H I J K L M N O P Q R ST
3-48 3-49
9. TIMER CIRCUIT DIAGRAM( 4 TOOL )
A B C D E F G H I J K L M N O P Q R ST
3-50 3-51
10. TIMER CIRCUIT DIAGRAM( 6 TOOL )
A B C D E F G H I J K L M N O P Q RST
3-52 3-53
11. TIMER CIRCUIT DIAGRAM( 7 TOOL )
A B C D E F G H I J K L M N O P Q RST
3-54 3-55
WAVEFORMS
IC301 Pins 8, 9 PB mode 500mvp-p
IC301 Pins 15, 17, 19, 21 Video in 1Vp-p
IC301 Pin 31 PB/REC mode
4.0Vp-p
IC301 Pin 98 REC mode
1.1Vp-p
IC301 Pin 94 REC mode
2.0Vp-p
IC301 Pin 29 PB mode
2.02Vp-p
IC301 Pin 57 PB mode 400mVp-p
IC301 Pin 63 PB mode 400mVp-p
IC301 Pin 73 PB/REC mode 5Vp-p
IC301 Pin 74 PB/REC mode 5Vp-p
IC301 Pin 77 REC mode 340mVp-p
IC301 Pin 42 PB mode 300mVp-p
IC301 Pin 53 PB mode 400mVp-p
IC301 Pin 80 PB mode
3.6Vp-p
IC301 Oscilloscope Waveform
IC501 Waveform Photographs
V.HSW (IC501 Pin 23) 1V/10mS REC/PB MODE
DV.SYNC (IC501 PIN 24) 1V/100uS QUE/REV MODE
CTL(+) (IC501 Pin 74) 1V/10mS
CTL(-) (IC501 Pin 75) 1V/10mS
DFG/DFG (IC501 PIN 65) 1V/10mS REC/PB MODE
CFG (IC501 Pin 67) 1V/10mS
V.IN (IC501 Pin 49) 500mV/20uS
3-56 3-57
1 20m 100m
2 20m 100m
3 20m 100m
4 1.95V 4.88V
5 1.94V 1.88V
6 2.64 3.12V
7 2.8V 2.74
8 2.5V 1.7V
9 2.04 1.3
10 1.80V 1.88
11 2.0V 1.8
12 1.6V 0.72
13 0V 0
14 1.26V 1.3
15 3.40V 3.36
16 0 4.78
17 2.38V 2.32
18 1.88V 2.84
19 3.02V 2.94
20 0 0
21 2.38V 2.34V
22 4.88V 4.82
23 2.64V 2.24
24 0 0
25 2.08V 2.14
26 3.08V 2.66V
27 0 0
28 150mV 140m
29 3.88V 3.18V
30 2.08V 2.74V
31 4.74V 4.72m
32 2.08V 2.12V
33 2.42V 2.26
34 1.58 1.54V
35 3.30V 3.36
36 2.50V 2.32
37 3.10V 3.18
38 2.60V 2.28
39 1.40V 1.42V
40 2.30V 2.16V
41 1.08V 1.58V
42 1.82V 1.84V
43 2.04V 2.28V
44 0 0
45 2.88V 3.04V
46 2 2.98
47 4.82 4.78
48 120mV 2.40
49 3.48 1.94V
50 4.78 4.74
51 2.08V 1.98
52 4.8V 4.70
53 2.60V 2.8
54 0 0
EE PLAY
MODE
PIN NO.
IC301
55 1.3 1.48
56 0 0
57 2.08V 2.18
58 1.78V 2.14
59 4.6V 4.62
60 4.62V 4.62
61 3.82V 0
62 2.2V 2.08V
63 2.32V 2.32
64 1.62V 1.64
65 1.62 2.28
66 2.30V 1.68
67 0 0
68 1.12V 1.14
69 2.3V 2.38V
70 0.82 0.82V
71 2.2V 2.18V
72 100m 2.42
73 4.96V 4.98
74 4.96V 4.98
75 2.56V 2.54
76 2.34V 2.18
77 2.68V 2.64
78 0 4.72
79 0V 0
80 2.16 2.68
81 4.06V 20M
82 0V 0
83 120M 2.72
84 2.76V 4.74
85 2.114 2.42
86 2.04V 2.08V
87 2.04 2.08V
88 0V 0
89 2.14 2.08V
90 2.14 2.08
91 2.14V 2.08
92 4.88V 4.89
93 300MV 260M
94 2.48V 2.40V
95 2.48V 1.86
96 2.06V 1.86
97 0 0
98 2.30V 2.46V
99 0V 20M
100 2.48 2.42V
10 0
2 4.52 4.82
3 4.84 4.84v
4 4.64 4.58v
5 4.56 4.56v
6 80m 60m
70 0
8 4.98 4.98
EE PLAY
MODE
PIN NO.
• CIRCUIT VOLTAGE CHART
9 4.98 5.30
10 4.8 4.80v
11 4.82 4.82
12 4.72v 4.82
13 4.92 4.92
14 5.02 5.02
15 0 0
16 4.98v 4.98
17 5.04 5.04
18 4.98v 9.98
19 2.46v 2.46
20 3.36V 3.36
21 0 0
22 0 0
23 4.96v 4.96v
24 120mv 140m
25 4.94 4.94
26 4.92v 4.92v
27 20m 20mv
28 5.02 5.02v
29 4.98v 4.98
30 4.84v 4.84
31 5.00v 5.00v
32 0 0
33 4.98 4.94
34 0 5.00v
35 5.02 100m
36 3.16 3.12v
37 5.7v Da/Clk(5.5)
38 0 5.7v
39 520m 0
40 4.84 520m
41 4.83 Da/Clk(5.62)
42 4.86v 4.86v
43 0 0
44 5.02 5.0v
45 0 0
46 3.94 3.94v
47 2.88 2.88v
48 0 0
49 0.98 2.94
50 1.84 1.94v
51 0.98 4.78
52 3.28 3.28v
53 2.38 2.38v
54 2.52 2.54v
55 1.88 1.88
56 0 0
57 0 0
58 120m 120m
59 4.92v 4.92v
60 4.92v 4.92v
61 0 0
62 4.82 4.82v
63 3.98 3.98v
EE PLAY
MODE
PIN NO.
64 0 0
65 2.36 2.36v
66 0 0
67 4.68 9.68v
68 0 0
69 2.48 2.48v
70 2.48 2.48
71 0 0
72 2.48 4.98
73 4.92 4.92v
74 0 0
75 2.52 2.42
76 2.42 2.48
77 80m 80m
78 0 0
79 4.02v 4.96v
80 4.96v 4.96
81 2.8 280m
82 1v 2.62v
83 120m 3.24v
84 0 1.96
85 0 0
86 4.98 4.9v
87 4.98 4.98
88 5.0v 5.0v
89 0 0
90 4.88 4.88v
91 0 0
92 0 0
93 5.04v 5.04v
94 4.88 0
95 4.98 4.98
96 0 0
97 0 0
98 4.98 4.98
99 20m 4.98v
100 0 0
1 4.88 4.88v
2 1.46 1.48
3 1.38 1.38
40 0
5 2.26v 2.24
6 2.38 0
70 0
80 0
90 0
10 0 0
11 0 5.0v
12 5.0v 5.0
13 5.0v 0
14 0 0
15 0 0
16 0 0
17 0 0
EE PLAY
MODE
PIN NO.
IC751
IC501
18 0 0
19 4.88 4.88
20 0 0
21 0 0
22 0 0
23 0 0
24 0 0
25 0 0
26 0 0
27 0 0
28 0 0
29 0 0
30 2.96v 3.98
31 2.96 3.98
32 0 0
33 4.88v 4.88
34 3.64v 3.58v
35 0 0
36 2.62v 2.58
37 0 0
38 0 0
39 0 0
40 2.54v 2.54
41 2.54 2.56
42 2.48 2.48
43 2.3v 2.34
44 0 0
10 0
20 0
3 0 142M
4 DA/CL(5.34) DA/CL(5.34)
5 DA/CL(5.34) DA/CL(5.34)
60 0
7 DA/CL(5.34) DA/CL(5.34)
80 0
9 DA/CL(5.34) DA/CL(5.34)
10 DA/CL(5.34) DA/CL(5.34)
11 0 41M
12 DA/CL(2.82) DA/CL(2.82)
13 0 0
14 DA/CL(2.82) DA/CL(62M)
15 2.89 1.41
16 1.53 950M
17 DA/CL(1.14) DA/CL(810M)
18 0 0
19 5.26 5.24
20 5.26 5.24
1 3.28 3.24
2 3.28v 3.28
3 3.32 3.26
4 3.28 3.92
5 3.28 3.92
6 3.28 3.26
EE PLAY
MODE
PIN NO.
IC7V1
IC801
7 3.28v 3.74
8 3.28 3.24
9 3.28v 3.24
10 3.28 3.24
11 3.28v 3.26
12 0 0
13 3.78 4.52
14 0 0
15 0 640m
16 5.82 6.64
17 5.28v 6.68
18 0 620m
19 6.28 6.66
20 6.28 6.72
21 4.46v 4.42
22 3.28 4.02
23 3.62 3.68
24 3.74 4.12
25 3.74 3.76
26 0.1 640m
27 0 0
28 3.7v 3.68
29 3.66 3.64
30 0.7 680m
31 3.72 3.72v
32 3.74v 4.08
33 3.62 3.68
34 13.4v 13.32
35 580m 520m
36 0 520m
37 580m 520m
38 0 0
39 0 20m
40 4.7 4.76
41 0v 1.68
42 5.0v 5.04m
43 50.v 4.96
44 20m 3.38
1 4.76 4.68
2 2.02v 2.24
3 4.88 4.88
4 1.64 1.78
5 4.72 4.78
6 1.88 1.88
70 0
8 2.26 2.18
90 0
10 1.64v 1.72
11 0 0
12 1.92v 2.08
13 4.86 4.82
14 1.92v 2.08
15 0 2.31
16 2.26v 2.64
EE PLAY
MODE
PIN NO.
IC901
17 0 0
18 2.28 2.74
19 0 0
20 2.56v 2.58
21 2.64v 2.68
22 0 0
23 2.56v 2.92
24 0 0
25 0 0
26 2.52v 2.98
27 20m 0
28 4.72 4.68
1 2.51 2.51
2 2.39 2.39
3 3.54 3.53
4 2.57 2.56
5 1.52 1.34
6 0.43 3.68
7 1.3m 0
8 1.2m 0
9 3.04 3.03
10 2.52 2.52
11 2 2.05
12 3.22 1.97
13 3.99 3.99
14 2.5 2.495
15 3.11 1.93
16 3.2 3.18
17 27.4m 4.11
18 112.1m 3.35
19 2.27 2.26
20 1.99 2.12
21 2.31 2.37
22 0.78 0.81
23 5.02 5.01
24 5.02 5
25 2.44 2.27
26 2.44 2.26
27 2.82 2.85
28 181.5m 187.4m
29 371.6m 212.2m
30 2.08 2.08
1 3 2.99
2 36.3m 38.1m
3 3.04 3.04
4 6.4m 39.1m
5 3.04 3.04
6 5.02 5.03
7 2.24 2.23
80 0
1 6.71 6.66
2 5.05 5.05
EE PLAY
MODE
PIN NO.
IC901
IC302
IC804
3 6.02 5.96
40 0
5 6 5.96
6 5.99 5.94
7 22.3m 21.3m
8 6.68 6.65
9 6.7 6.67
10 1.1m 0
11 6.71 6.68
12 5.04 5.05
13 12.03 11.99
14 6.7 6.7
15 0 0
16 6.73 6.69
1 1.3 1.3
2 4.9 4.9
3 1.66 1.56
40 0
50 0
6 4.9 4.9
7 1.7 1.6
80 0
1 1.37 1.37
25 5
3 2.18 2.17
40 0
50 0
6 5.21 5.21
7 2 2.17
80 0
EE PLAY
MODE
PIN NO.
IC902
IC903
3-58 3-59
Q501 0 0 740M
Q503 5.19 5.19 4.57
Q504 Y/C_VIDEO 0 Y/C_VIDEO
Q505 Y/C_VIDEO 0 Y/C_VIDEO
Q506 0 2Fsc 2Fsc
Q514 0 0 4.87
Q515 0 0 4.87
Q301 0 5.04 0
Q302 5.04 0 5.04
Q303 0 0 0
Q304 0 0 0
Q306 4.93 4.81 4.79
Q308 Y/C_VIDEO 0 Y/C_VIDEO
Q311 5.04 5.04 0
Q7S1 0 1.47 0
Q7S2 0 0 5.13
Q901 5.1 0 4.5
Q902 0 0 0
Q903 0 0 0
Q904 0 4.5 0
Q905 2.69 0 2
Q906 1.7 0 1.7
Q907 11.9 11.8 0
Q908 0 0 5
Q909 0 7.4 0
Q910 4.6 5 5.1
EC B
E-MODE
NO.
C203 3.55 0 3.51 0
C204 3.34 0 3.59 0
C207 3.12 0 1.93 0
C210 2.26 0 2.94 0
C213 3.29 0 2.77 0
C215 4.97 0 4.89 0
C301 5.01 0 0 0
C302 5.03 0 4.24 0
C304 4.99 0 4.85 0
C307 2.29 4.87 2.27 0
C311 5.11 5 190M 0
C314 2.35 0 2.31 0
C315 2.92 2.79 2.83 2.31
C316 1.48 0 1.57 0
C318 4.1 0 2.85 0
C320 2.39 0 2.2 0
C322 4.13 0 4.09 0
C323 2.35 0 2.31 0
C324 2.42 0 0 0
C325 2.95 0 3.13 0
C327 2.61 2.46 3.18(Y/C) 3.18(Y/C)
C331 17.5M 0 0 0
C333 4.94 0 4.88 0
C336 5.04 0 5.01 0
C337 3.36 0 2.53 0
C339 3.38 0 2.62 0
C346 5 0 4.91 0
C347 2.16 0 2.14 0
C348 1.62 0 1.5 0
C349 5.02 0 4.92 0
C353 2.31 0 2.25 0
C356 1.97 0 2.07 0
C357 2.17 0 2.02 0
C359 264M 0 130M 0
C362 5.2 0 5.19 0
C391 2.99 2.7 3.02 780M
C392 3.03 2.75 3.07 2.75
C393 3.03 2.76 3.12 0
C501 5.2 0 5.19 0
C502 5.19 0 5.19 0
C504 2.36 2.06 2.3 2
C505 5.22 0 5.19 0
C507 4.95 0 4.95 0
C511 2.41 1.32 2.41 1.3
C522 2.61 0 2.64 0
C523 2.61 2.61 2.64 0
C524 2.61 0 2.64 0
C526 16.74 0 13.6 0
C534 4.24 0 62M 0
C546 14.73 0 14.2 0
C7S1 4.9 4.17 4.85 4.09
C7S2 4.9 0 4.85 0
C7V1 5.22 0.91 5.28 0
C7V3 2.86 1.47 2.16 950M
C710 32.61 0 32.4 0
EE PLAY
+–+–
SECTION
NO.
C718 5.05 0 4.96 0
C719 5.04 0 4.96 0
C724 2.39 164M 2.31 0
EE PLAY
+–+–
SECTION
NO.
3-60 3-61
LOCATION GUIDE
PRINTED CIRCUIT DIAGRAMS
1. VCR P.C.BOARD(TOP VIEW)
2. VCR P.C.BOARD(BOTTOM VIEW)
3-62 3-63
LOCATION GUIDE
3-64 3-65
3. SMPS P.C.BOARD
LOCATION GUIDE
3-66 3-67
4. JACK P.C.BOARD
( 2 TOOL, 3 TOOL )
LOCATION GUIDE
( 4 TOOL, 8 TOOL )
LOCATION GUIDE
( 6 TOOL )
LOCATION GUIDE
3-68 3-69
5. KEY P.C.BOARD 6. Timer P.C.BOARD
( 2 TOOL ) ( 2 TOOL )
( 3 TOOL ) ( 3 TOOL )
( 4 TOOL ) ( 4 TOOL )
( 6 TOOL ) ( 6 TOOL )
( 8 TOOL ) ( 8 TOOL )
3-70
VDR ELECTRICAL TROUBLESHOOTING GUIDE
1. Power(SMPS) CIRCUIT
No 3.8VA
Replace the F101 (Use the same Fuse)
Is the F101
Normal?
Is the TH01
Normal?
Is the BD101
Normal?
NO
NO
NO
NO
NO
NO
NO
NO
NO
Replace the BD101
Replace the TH01
Is the D104
normal?
Check or Replace
the D104
Replace the D122
Replace the IC106
Replace the D123
Replace the D124
Replace the D125
YES
YES
YES
YES
YES
YES
YES
YES
YES
Is Vcc (11V - 18V)
supplied to IC101 Pin3?
NO
Are the D122
normal?
Is there about 2.5V at the IC106 Pin1?
Is the D123
normal?
Is the D124 Normal?
Is the D125 Normal?
Power Line of Main PCB(VDR) is short
VDR PART
No 3.3V
Check or Replace the D122
Is there about 3.8V at the IC154 pin1?
Check the IC154 and Replace
Is there about 3.3V~ 5V at the IC154 pin4?
NO
NO
Check the ‘DVD PWR CTL “H”’ signal from µ-com
YES
YES
3-71
VDR ELECTRICAL TROUBLESHOOTING GUIDE
No 2.5V
Check or Replace the D122
Check the ‘DVD PWR CTL
“H”’ signal from µ-com
Is there about 3.8V
at the IC152 pin1?
Is there about 3.3V~
5V at the IC152 pin4?
Check the IC152
and Replace
NO
NO
YES
YES
No 5.0V
Check or Replace
the D124
Is there about 5.5V
at the IC151 pin1?
Is there about 3.3V~ 5V
at the IC151 pin4?
NO
Check the ‘DVD PWR CTL “H”’ signal from µ-com
NO
YES
Check the IC151
and Replace
YES
No 1.8V
Check or Replace the D123
Is there about 2.3V
at the IC160 pin1?
Is there about 3.3V ~ 5V at the IC60 pin4?
NO
Check the ‘DVD PWR CTL “H”’ signal from µ-com
NO
Check or Replace the R167,R168
NO
YES
Are the R167,R168
normal?
YES
Check the IC160
and Replace
YES
Check or Replace
the D124
NO
YES
No 12V
Check or Replace the D125
Is there about 13.5V
at the IC157 pin1?
Check the IC157 and Replace
Is there about 3.3V~
5V at the IC157 pin2?
NO
NO
Check the ‘DVD PWR CTL
“H”’ signal from µ-com
YES
YES
3-72
2. No Component video signal when playing DISC
Component : No Y Signal Component : No Pb Signal Component : No Pr Signal
R905, C923 R904, C922 R903, C921
IC601 – 12 Check input
IC601 – 14 Check input
C907 C908
IC601 – 10 Check input
C906
FL505, FL506, FL507 Check Signal in DVD Board
Check CLK X101
Check IC101 Power and Other Circuits
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO NO
NO NO
NO
VDR ELECTRICAL TROUBLESHOOTING GUIDE
3-73
VDR ELECTRICAL TROUBLESHOOTING GUIDE
3-73
3. No COMPOSITE / S-VIDEO signal when playing DISC
COMPOSIT : No Signal S-VIDEO : No Y Signal S-VIDEO : No C Signal
R911, C927 R902, C920 R901, C919
IC601 – 6 Check input
IC601 – 2 Check input
C904 C902
R4103, R4107 Check Signal
IC601 – 4 Check input
C903
IC5101-40 : HIGH /RST_VENC
R154, R155 Signal and 3.3V level
IC5101 41,42 Check I2C Clk, Data
Check R5101 CLOCK
R5124~R5131 Check VO_D0 ~VO_D15
Check IC101 power And Other circuits
IC5101 9~16 Check MP7~MP0 signal
YES
YES
YES
YES
YES
YES
YES YES
YES
YES
YES
YES
YES
YES
YES
YES
NO NO
NO NO
NO
NO
NO
NO
3-74
VDR ELECTRICAL TROUBLESHOOTING GUIDE
4. No TV, External Input video signal
No : TV signal AV3No : AV1 signal No : AV2 signal
No : S-JACK
signal
TU701 1-19 Check signal And circuit
IC802 - 1 IC802 - 3
IC501 – 1, 3, 8 check in the DVD Board
Replace X501 X­TAL
IC301 – 21
check
IC802 - 28
IC802 – 31 Check output
IC301 - 15
IC301 – 29 check
Q310 collector Signal, power 12 V
C909, Q905 Check circuit
FL501 Check signal
YESYES YESYES
YES
YES YES
YES YES
YES
YES
YES
YES
YES
YES
YES
YES
IC502-34 : HIGH
/RST_VDEC
R4103, R4106 signal
YES
NO
when reset IC502 – 28, 29 Check I
2
C
Clk, Data
Check R533, R526 Signal and
3.3V level
YES
NO
check IC502 - 40 (VI_CLK)
Check X501 clock oscillated
YES
NO NO
<When playing DISC, no COMPONENT, COMPOSIT/S-VIDEO signal> Check
IC502 -> IC101 Check VI_D0~VO_D9 signal
Check IC502 power and other circuits
YES
NO
NO
IC301 - 17
NO NO
3-75
VDR ELECTRICAL TROUBLESHOOTING GUIDE
Check VCR PART
PN303-1 signal
normal
Check FFC Cable
Signal flow
NO
YES
Audio output even
When playing DISC
PN304-19~22 Check
audio signals
NO
Check FFC Cable
and VCR part
NO
Check FFC Cable
and VCR part
Check IC801 power and other circuits
NO
Check AV_RST1 and power, other circuits
NO
YES
IC803 – 1, 7 Check
audio signals
YES
IC802-9 Check
High?
YES
Check IC802 power
And Other circuits
YES
NO
YES
5. When playing DISC, no audio output
6. No TUNER audio output
7. No OPTICAL / DIGITAL output
IC802 – 15, 18 Check audio signals
Check IC802 power
and other circuits
NO
Check AV_RST1 and
power, other circuits
NO
IC802-10 Check
High?
YES
Check IC802 power
And Other circuits
YES
3-76
VDR ELECTRICAL TROUBLESHOOTING GUIDE
3-76
<when playing DISC, no audio output> check
Check FFC Cable
and VCR part
Audio output even
When playing DISC
PN304-19~22 Check
audio signals
IC802 – 15, 18
Check audio signals
NO
NO
Check IC802 power
and other circuits
NO
Check AV_RST1 and
power, other circuits
NO
YES
YES
IC802-10 Check
High?
YES
Check IC802 power
And Other circuits
YES
<when playing DISC, no audio output> check
Check Audio Cable
Audio output even
When playing DISC
PN5401 – 4~6 Check
audio signals
PN304-27~30 :
Check audio signals
NO
NO
Check PN302-5,6 and Front Jack Cable
NO
Check FFC Cable
and VCR part
NO
Check IC804 power
and other circuits
NO
YES
YES
PN304-19~22
Check audio signals
YES
IC804 – 10, 12 Check audio signals
YES
Check /RST-Audio and power, other circuits
IC804-9 Check
High?
Check IC804 power
And Other circuits
NO
YESYES
YES
IC802 – 15, 18
Check audio signals
Check IC802 power
and other circuits
NO
Check AV_RST1 and
power, other circuits
NO
YES
IC802-10 Check
High?
YES
Check IC802 power
And Other circuits
YES
Check IC804 power
and other circuits
NO
IC804 – 10, 12 Check audio signals
YES
Check /RST-Audio and power, other circuits
IC804-9 Check
High?
Check IC804 power
And Other circuits
NO
YESYES
YES
8. No External Input 1, 2 audio 9. No External Input 3 audio
BLOCK DIAGRAMS
1. VDR SET TOTAL BLOCK DIAGRAM
3-77
REAR JACK
AV1_IN
3
AV1
S_Jack
Y/C
2
A_R/L
2
Stereo
V_cvbs
CVBS
YPbPr
VCR_A_R/L
YPbPr
Coaxial
3
VCR BOARD
COAXIAL
OPTICAL
Optical
D2
D_out
TU_AV_out
6
2
TUNER
2
TU_AV_in
D_control R_Pr_OUT
G_Y_OUT C_OUT
Y_OUT
CVBS_OUT
YC_MIXER
V_VCR_IN
IEC958
B_Pb_OUT
V2_IN
A_OUT A2_IN
A_IN
3
2 2
2
VDR BOARD
Serial Comm.
Int_Prog
VDR_reset_L
4
V2A2Y/C
FRONT JACK BOARD
2
2
AV2_IN
4
TP
16
BD[15:0]
DV
9
12
BA[12:1]
CON[8:0]
9_IN_2
ATA_address[4:0]
ATA_data[15:0]
ATA_RESET
ATA_INT / IORDY / DIOR / DIOW / DMAACK
DVD RW DRIVE
3-783-78
2. VDR MAIN H/ W BLOCK DIAGRAM
DDR
Memory
VCR Board
VDR_A
A_OUT
IEC958
UNIT
AUDIO_OUT
AO_D[3:0]
AO_IEC958
COX/OPT
VO_D[15:8]
Y/Pb/Pr
Y/C/CVBS
G_Y/B_Pb/R_Pr
Y/C/CVBS_OUT
UNIT
VIDEO_OUT
CVBS
Y/C
VO_D[7:0]
U-COM
D2
I/P
SDA
SCL
CPRM_crl
BA[1:22]
Serial Comm.
VDR_RESET_L
UNIT
UCOM_IF
R/G/B
SIO_SPI_...
D_Control
Int_Prog
EEPROM
SDA
SCL
CS0
FLASH
Memory
HD[0:15]
BA[6:21]
Latch
74LVT16373
BA[1:5,22]
DMN Board
AI_D0
UNIT
AUDIO_IN
A_IN
A_IN
VCR Board
V_VCR_IN
VI_D[2:9]
UNIT
VIDEO_IN
Y/C
V_VCR_IN
YC_MIXER
A2_IN
V2_IN
AV2_IN
YC_MIXER
Front Jack
DV 1394
TP
AV2_IN
BIO_PHY_DATA[0:7]
UNIT
DV
HD[15:0]
UNIT
HOST_IF
BD[15:0]
S_JACK_DET
UNIT
CARD
MEMORY
BA[12:1]
CON[8:0]
9_IN_2
DATA[15:0]
ADD[4:0]....
DVD-RW DRIVE
3-79
3. POWER BLOCK DIAGRAM
3.3VA
5VD
3.3VA
3V3
3.3V
VDDD
2.5V
VDDA
SAA7120
1.8V
+12V
MC33202
MC33202
5VD
+12V
L2146
IOVDD
A33VDD
DVDD
A18VDD
V33PHY
TSB41AB1
VA
VA_H
NJM2274
CS4351
VL
VA
CS5340
VL
24LC168
74HCT125
3V3D
1.8V 3V3
FLASH
74LVT273
74ALVT16373
74LVT16245
74LVC245
74LVC32
74LVC04
74LVC541
74LVC08
2.5V
TT
E5_1V81.8V
E5_3V3
E5_5VD5VD
V
G2995
1.25V
E5_2V52.5V
1.25V
DDR
SDRAM
VREF
E5_2V52.5V
SSTL2_VDD2.5V
DMN8602
3.3V
3-80
4. AUDIO IN/ OUT BLOCK DIAGRAM
DMN8602
AI_MCLK0
AI_SCLK
MCLK
SCLK
ADC_L
AI_FSYNC
AI_D0
LRCK
SDOUT
ADC
(CS5340)
ADC_R
AV_RST1
/RST_AUDIO
AO_MCLK0
AO_SCLK
AO_FSYNC
AO_D0
LRCK
SCLK
SDIN
MCLK
DAC
DAC_L
DAC_R
SCL
(CS4351)
SCL
SDA
SDA
VCR Board
OP AMP
(MC33202)
A_L_IN
A_R_IN
A2_L_IN
A2_R_IN
Front Jack
A2_L_IN
A2_R_IN
OP AMP
(MC33202)
A_L_OUT
VCR Board
A_R_OUT
3-813-81
5. CPU & CONTROL REGISTER BLOCK DIAGRAM
/SMSC_CS
Ethernet
LAN91C111
BA[1:17]
BD[0:15]
/RST_SMS
C
SMSC_IRQ
CS0
BA[1:22]
Flash
E5_WEL
E5_OE
4(8)MByte
HD[0:15]
74LVT16373
GND
BA[6:21]
Q
OE
D
E5_ALE
BD[0:15]
HD[0:15]
G
[1:5,22] BA[1:5,22]
BD[0:15]
74LVT16245
HD[0:15]
LAN_CS
/E5_OEL
Card
Memory
HD[0:15]
BA21
MEM_CON_SIG
74LVC32
/CS2
/BA[20:21]
/RST_VDEC
GPIO2
BA[20:21]
74LVC04
/RST_VENC
/RST_ PHY
/RST_AUDIO
GPIO1
E5_RST
MEMC_RST
GPIO4
DMN8602
E5_MA[1:5,22:26]
3-823-82
6. VIDEO IN/ OUT BLOCK DIAGRAM
DMN 8602
VI_CLK0
VI_VSYNC0
VI_D[9:0]
VI_CLK0
VI_D[9:0]
VI_VSYNC0
VDEC
SCL
SDA
(L21146)
GPIO
/RST_VDEC
VO_D[7:0]
/RST_VENC
VO_D[7:0]
VENC
VO_CLK
VO_CLK
(SAA7120)
YCCVBS
G/Y
R/Pr
B/Pb
YC MIX
(NJM2274)
14.3MHz
MIX_OUT
V_VCR_IN
VCR Board
Y_OUT
C_OUT
CVBS_OUT
G_Y_OUT
R_Pr_OUT
B_Pb_OUT
V2_IN
V2_MIX_OUT
Front Jack
V2_IN
Y_IN
C_IN
3-83
7. DV 1394 IN/OUT BLOCK DIAGRAM
DMN 8602
PHY_DATA[7:0]
PHY_CTL[1:0]
PHY_LREQ
PHY_LPS
PHY_LINK_ON
PHY_CLK
GPIO
DV 1394
(TSB41AB1 )
TPA1+-/TPB1+1
DV
/RST_PHY
Front Jack
3-84
8. MEMORY CARD IN/ OUT BLOCK DIAGRAM
DMN8602
HD[15:0]
E5_ALE
HD[15:0]
GPIOExt
/WAIT
WAIT
OE/WE/RST
Host IF
Block
IO_READY
MEMC_OE/WE/RST
/CS2
BA[21:20]
CS2
/BA[21:20]
Header H601
BUS
BUFFER
PD[15:0]
PA[2:0] BA[18:16]
IC6901~
IC6903
READY
DR/DW/RST
9_IN_2
74LVC32
IC6904
ATA_CON_SIG
3-85 3-86
CIRCUIT DIAGRAMS
1. BGA 308P CIRCUIT DIAGRAM
A B C D E F G H I J K L M N O P Q R ST
3-87 3-88
A B C D E F G H I J K L M N O P Q R ST
2. DDR & B TO B CONNECTOR CIRCUIT DIAGRAM
3-89 3-90
A B C D E F G H I J K L M N O P Q R ST
3. POWER, FLASH, CONNECTOR CIRCUIT DIAGRAM
A B C D E F G H I J K L M N O P Q R ST
3-91 3-92
4. RST, CONTROL/STATUS_REG., ATAPI, HOST_CPLD, LATCH CIRCUIT DIAGRAM
3-93 3-94
A B C D E F G H I J K L M N O P Q R ST
5. VIDEO_IN, VIDEO_OUT CIRCUIT DIAGRAM
A B C D E F G H I J K L M N O P Q R ST
3-95 3-96
6. DV1394, HDMI CIRCUIT DIAGRAM
3-97 3-98
A B C D E F G H I J K L M N O P Q R ST
7. AUDIO IN/OUT CIRCUIT DIAGRAM
3-99 3-100
• WAVEFORMS
X101
13.5MHz
IC5101 PIN42 SDA
IC502 PIN29 SDA
IC502 PIN40 VI_CLK
IC502 PIN74
14.318MHz
PN304 PIN5 CVBS_OUT
PN304 PIN9 Y_OUT
PN304 PIN11 C_OUT
PN304 PIN17 R_Pr_OUT
PN304 PIN13 G_Y_OUT
PN304 PIN15 B_Pb_OUT
IC5101 PIN4 VO_CLK
PN303 PIN1 IEC958
IC802 PIN4 ADAC_MCLK
IC802 PIN2 ADAC_SCLK
IC802 PIN3 ADAC_LRCK
IC804 PIN4 ADC_SDATA(AI_D0)
IC802 PIN1 DAC_SDATA(AO_D0)
IC502 PIN53 VI_D1
PN7401 PIN 12 VDR_CLK
PN7401 PIN 13 VDR_DIN
PN7401 PIN 14 VDR_DOUT
PN7401 PIN 15 VDR_ENB
3-101 3-102
EE PB REC
MODE
PIN NO.
IC1201
IC302
IC402
IC405
16 0.19 0.19 0.19
17 0.19 0.19 0.19
18 3.29 3.29 3.29
19 0.19 0.19 0.19
20 0 0.19 0.19
21 0 0 0
22 0.19 0.19 0.19
23 0 0.19 0.19
24 3.28 3.29 3.29
25 3.29 3.29 3.29
26 0 0 0
27 0 0 0
28 0 0 0
29 0 0 0
30 0 0 0
31 3.29 3.29 3.29
32 0 0 0
33 0 0 0
34 0 0 0
35 0 0 0
36 0 0 0
37 0 0 0
38 0 0 0
39 0 0 0
40 0 0 0
41 0 0 0
42 3.29 3.28 3.29
43 0 0 0
44 0 0 0
45 0 0 0
46 0 2.92 0
47 0 2.92 0
48 3.29 3.29 3.29
10 0 0
2 0 0.04 0.04
3 0 0.04 0.04
40 0 0
5 0 3.29 3.29
6 0 3.29 3.29
7 3.14 3.29 3.29
8 0 0.04 0.04
9 0 0.04 0.04
10 0 0 0
11 0 0.04 0.04
12 0 0.04 0.04
13 0 0.04 0.04
14 0 0.04 0.04
15 0 0 0
16 0 0.04 0.04
17 0 0.04 0.04
18 0 3.29 3.29
19 0 0.04 0.04
20 0 0.04 0.04
21 0 0 0
EE PB REC
MODE
PIN NO.
IC406
22 0 0.04 0.04
23 0 3.29 3.29
24 0 0 0
25 0 0.01 0.01
26 0 0 0
270 0 0
28 0 0 0
29 0 0 0
30 0 0 0
31 0 3.29 3.29
32 0 0 0
33 0 0 0
34 0 0 0
35 0 0 0
36 0 0 0
37 0 0 0
38 0 0 0
39 0 0 0
40 0 0 0
41 0 0 0
42 3.16 3.29 3.29
43 0 0 0
44 0 0 0
45 0 0 0
46 0 0 0
47 0 0 0
48 0 0 0.01
1 0 0.001 0.001
2 0 0.002 0.004
30 0 0
4 3.22 3.256 3.255
5 3.22 3.256 3.255
60 0 0
7 0 0.002 0.002
8 0 0.001 0.002
9 0 0.001 0.002
10 0 0 0
11 1.78v 1.854 1.851
12 1.78 1.854 1.851
13 0 0 0
14 1.78 1.854 1.851
15 0 0 0
16 0 0.002 0.002
17 0 0.001 0
18 0 0.002 0.002
19 0 0 0
20 3.22 3.255 3.255
21 3.22 3.255 3.255
22 0 0 0
23 1.08 0.17 0.17
24 0. 0 0
25 1.78 1.852 1.848
26 0 0 0
27 0 0 0
EE PB REC
MODE
PIN NO.
IC502
28 3.24 3.254 3.253
29 3.22 3.255 3.25
30 0 0.954 0.978
31 1.7 1.855 1.852
32 0 0 0
33 0 0 0
34 3.22 3.254 3.252
35 0 1.029 0.964
36 0 1.029 0.522
37 0 0 0
38 3.24 3.252 3.252
39 0 0 0
40 2.54 1.566 1.566
41 1.78 1.855 1.854
42 90m 0 0
43 3.08 1.642 1.642
44 2.88 1.643 0.199
45 2.88 0.399 0.405
46 2.92 1.299 1.303
47 2.68 0.369 0.37
48 3.24 3.252 0.252
49 0 0 0
50 2.64 0.372 0.376
51 2.64 0.369 0.379
52 2.64 0.382 0.372
53 2.64 0.392 0.397
54 2.64 1.855 0.382
55 1.28 0.39 1.852
56 20m 1.855 0
57 3.24 0 0.866
58 0 1.059 0.7
59 0 1.056 0.759
60 0 1.05 0.716
61 3.24 3.253 3.252
62 0 0 0.099
63 0 0.944 1.004
64 0 0.965 0.669
65 0 0.879 0.93
66 0 0.943 1.034
67 1.78 1.856 1.852
68 0 0 0
69 0 0 0
70 3.18 1.022 1.054
71 0 1.53 1.53
72 0 2.942 2.942
73 0.8m 0.082 0.082
74 0.8m 0.082 0.861
75 0 0.792 0.672
76 1.78 1.852 1.848
77 0 0 0
78 1.78 1.853 1.849
79 0 0 0
80 0 0.001 0.003
1 1.32 1.322 1.325
EE PB REC
MODE
PIN NO.
2 0 0.004 0.006
3 32m 0.314 0.321
4 0 0.397 0.402
5 3.22 3.091 3.224
6 3.24 3.079 3.204
7 0 0.007 0.006
8 1.36 1.423 1.422
1 0 20mv 1.122
2 0 0.005 0.01
3 0 0.004 0.009
4 2.04 1.628 1.616
5 0 0.006 0.008
6 3.21 3.232 3.186
7 3.18 3.206 3.16
8 3.18 3.229 3.183
9 3.22 1.57 1.812
10 2.82 0.969 1.068
11 2.82 1.316 0.996
12 2.88 1.381 1.492
13 2.9 0.982 1.152
14 3.26 1.25 1.092
15 3.26 1.232 1.07
16 2.96 1.206 1.111
17 3.22 3.246 3.183
18 0 0.006 0.005
19 0 0.262 0.18
20 3.24 3.247 3.192
21 3.24 3.246 3.19
22 0 0.006 0.007
23 0 0.006 0.008
24 1.06 0.941 0.943
25 3.24 3.215 3.19
26 0 0.006 0.008
27 1.08 0.827 0.91
28 2.24 3.216 3.197
29 0 0.006 0.019
30 0 0.796 0.872
31 3.22 3.216 3.194
32 0 0.006 0.006
33 0 0.007 0.008
34 3.24 3.185 3.165
35 0 0.006 0.007
36 3.24 3.207 3.19
37 0 0.009 0.01
38 0 0.006 0.007
39 3.234 3.204 3.188
40 3.24 3.212 3.199
41 3.24 3.21 3.197
42 3.24 3.209 3.195
43 20m 0.009 0.011
44 20m 0.005 0.007
1 3.24 3.12 2.52
2 23.24 3.12 2.5
EE PB REC
MODE
PIN NO.
IC5101
IC802
IC501
3 3.24 3.18 1.68
4 2.24 2.82 1.64
5 3.16 3.14 1.65
6 0 0 1.64
7 3.24 3.24 1.64
8 3.22 3.24 0
9 3.22 3.24 4.94
10 3.22 3.24 4.94
11 3.24 3.24 3.25
12 1.22 1.12 3.25
13 12.2v 3.36 0.01
14 14.2v 1.2 3.25
15 4.28 0 2.42
16 0 14.2 2.49
17 14.2v 12.1 2.41
18 4.34 4.34 2.41
19 14.2 12.2 2.48
20 3.21 3.22 4.95
21 0 0 0.01
22 4.79 4.78 4.79
23 4.91 4.91 4.91
24 2.52 2.51 2.51
25 2.42 2.41 2.41
26 2.42 2.41 2.41
27 2.52 2.52 2.51
28 4.89 4.88 4.89
IC601 EE NO Conn. REC
1 2.64 2.64 1.62
2 3.42 3.52 1.06
3 3.42 3.48 0.01
4 3.54 3.58 0.5
5 3.56 3.62 0.5
6 0 0 0.02
7 0 0 0.02
8 0 0 0.02
9 0 0 0.02
10 0 0 0.02
11 0 0 0.02
12 0 0 0
13 3.26 3.27 3.26
14 0 0 0
15 0 0 0
160 0 0
17 0 0 0
18 0 0 0
19 3.04 3.24 3.23
20 3.04 3.26 3.11
21 3.04 3.26 3.26
22 3.04 3.2 3.25
23 0 0 0
24 0 0 0
25 3.24 3.24 3.26
26 0 0 0
27 0 0 1.83
28 0 0 1.83
EE PB REC
MODE
PIN NO.
29 3.12v 3.08 1.81
30 3.12v 3.12v 1.81
31 3.12 3.08v 1.82
32 0 0 0
33 0 0 0
34 1.24 1.22 1.21
35 3.24 1.22 3.26
36 0 8 0
37 3.24 3.1 3.26
38 0 1.48 0
39 1.34 3.22 1.4
40 3.28 3.28 3.26
41 0 3.22 0
42 1.48 1.48v 1.49
43 1.48 1.48v 1.49
44 2.96 3.24 3.26
45 3.24 3.24 3.26
46 0 0 0
47 0 0 0
48 2.88 2.88 0
EE PB REC
MODE
PIN NO.
• CIRCUIT VOLTAGE CHART
10 0 0
20 0 0
3 1.02 1.02 1.23
4 1.02 1.01 1.23
5 2.37 2.48 2.47
6 2.34 2.48 2.47
7 2.34 2.48 2.47
8 1.08 1.22 1.22
10 0 0
2 3.14 3.29 3.27
3 4.88 4.96 4.96
40 0 0
50 0 0
6 4.88 0.01 0.01
70 0 0
8 4.94 3.97 3.97
9 3.22 2.64 2.64
10 0 0 0
11 4.88 4.2 4.2
12 4.96 4.3 4.3
13 0 0 0
14 4.84 4.97 4.97
1 3.14v 3.29 3.29
2 3.14v 3.32 3.32
3 3.14v 3.29 3.29
4 0.04 0.04 0
5 0 0.04 0
60 0 0
70 0 0
8 3.14 3.29 3.29
9 3.14 5.09 5.9
10 3.14 3.29 3.29
11 3.14 3.29 3.29
12 4.98 5.09 5.09
13 3.14 3.29 3.29
14 3.14 3.29 3.29
1 3.28 3.28 3.29
2 3.31 0.19 0.19
3 3.22 0.19 0.19
40 0 0
5 0.19 0.19 0.19
6 0.19 0.19 0.19
7 3.29 3.29 3.29
8 0.19 0.19 0.19
9 0.19 0.19 0.19
10 0 0 0
11 0.19 0.19 0.19
12 0.19 0.19 0.19
13 0.19 0.19 0.19
14 3.31 0.19 0.19
15 0 0 0
3-103 3-104
PRINTED CIRCUIT DIAGRAMS
1. VDR P.C.BOARD(TOP VIEW)
3-105 3-106
2. VDR P.C.BOARD (BOTTOM VIEW)
POSITION DRAWING OF DECK MECHANISM PARTS
• Top View......................................................4-1
• Bottom View ...............................................4-1
DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM
01.Disassembly of Drum assembly ................4-2
02.Disassembly of Plate top disassembly..... 4-4
03.Holder Assembly CST ...............................4-4
04.Disassembly of Gear Assembly
Rack F/L ....................................................4-4
05.Opener Door .............................................4-4
06.Arm Assembly F/L .....................................4-4
07.Lever Assembly S/W.................................4-4
08.Motor Assembly L/D..................................4-5
09.Gear Wheel ...............................................4-5
10.Arm Assembly Cleaner..............................4-5
11. Head F/E...................................................4-5
12.Base Assembly A/C Head.........................4-5
13.Brake Assembly T .....................................4-6
14.Arm Assembly Tension..............................4-6
15.Reel S / Reel T..........................................4-6
16.Base Assembly P4 ....................................4-7
17.Opener Lid ................................................4-7
18.Arm Assembly Pinch .................................4-7
19.Arm T/up ...................................................4-7
20.Supporter, Capstan ...................................4-8
21.Belt Capstan/Motor Capstan .....................4-8
22.Lever F/R ..................................................4-8
23.Clutch Assembly D37................................4-8
24.Gear Drive/Gear Cam ...............................4-9
25.Gear Sector...............................................4-9
26.Brake Assembly Capstan..........................4-9
27.Plate Slider................................................4-9
28.Lever Tension ............................................4-9
29.Lever Spring..............................................4-9
30. Lever Brake ..............................................4-9
31.Gear Assembly P2/Gear Assembly P3 ...4-10
32.Base Assembly P2/Base Assembly P3...4-10
33.Base Loading ..........................................4-10
34.Base Tension ...........................................4-11
35.Arm Assembly Idler Jog ..........................4-11
DECK MECHANISM ADJUSTMENT
• Fixtures and tools for service ................4-12
1. Mechanism Assembly Mode Check ........4-13
2. Previous Preparation for
Deck Adjustment .....................................4-14
3. Torque Measuring ...................................4-14
4. Guide Roller Height Adjustment..............4-15
4-1. Prior Adjustment...............................4-15
4-2. Fine Adjustment ...............................4-15
5. Audio/Control (A/C) Head Adjustment......4-16
5-1. Prior Adjustment...............................4-16
5-2. Tape Path Check between Pinch
Roller and Take-up Guide ................4-17
5-3. Fine Adjustment
(Azimuth Adjustment).......................4-17
6. X-distance Adjustment ............................4-17
7. Adjustment after Drum Assembly
(Video Heads) .........................................4-18
8. Tachometer Adjustment of
Deck Assembly........................................4-18
8-1. Check of Audio, RF Normalization
Time (Locking Time) in Play after
CUE or REV.....................................4-18
8-2. Check of Tape Curl and
Jam Status .......................................4-18
PROTECTION, MAINTENANCE AND CHECK OF VIDEO FUNCTION
1. Checking Points before Repair ...............4-19
2. Essential Check and Repair....................4-20
3. Regular Check and Repair......................4-20
4. Tools for Check and Repair.....................4-20
5. Maintenance Process..............................4-20
5-1. Removal of Foreign Materials..........4-20
5-2. Grease Application...........................4-21
TROUBLESHOOTING GUIDE
1. Deck Mechanism.....................................4-23
2. Front Loading Mechanism.......................4-26
EXPLODED VIEWS
1. Front Loading Mechanism Section...........4-28
2. Moving Mechanism Section(1).................4-29
3. Moving Mechanism Section(2).................4-30
SECTION 4 MECHANISM OF VCR PART(D-37)
CONTENTS
4-1
POSITION DRAWING OF DECK MECHANISM PARTS
• Top View
• Bottom View
21
21 24 23
22
31
32
31 32 25 34
28 27 29
20
26
30
24
1 Drum Assembly 3 screws A-1 T
2 Plate Top 2 hooks A-2 T
2 3 Holder Assembly CST 6 chasses A-2 T
2,3 4 Gear Assembly Rack F/L 1 hook A-2 T
2,3,4 5 Opener Door Chassis Hole A-2 T
2,3,4,5 6 Arm Assembly F/L Chassis Hole A-2 T
7 Lever Assembly S/W Chassis Hole, A-2 T
1 hook
8 Motor Assembly L/D 1 screw A-3 T
9 Gear Wheel 2 hooks A-3 T
10 Arm Assembly Cleaner Chassis Embossing A-3 T
11 Head F/E Chassis Embossing A-3 T
12 Base Assembly A/C Head 1 screw A-3 T
2,3 13 Brake Assembly T 1 hook A-4 T
2,3 14 Arm Assembly Tension 1 hook A-4 T
2,3,13,14 15 Reel S / Reel T Shaft A-4 T
16 Base Assembly P4 Chassis Embossing A-5 T
17 Opener Lid Chassis Embossing A-5 T
17 18 Arm Assembly Pinch Shaft A-5 T
17 19 Arm T/up 1 hook A-5 T
20 Supporter, capstan Chassis Hole A-6 B
17,18 21 Belt Capstan/Motor Capstan 3 screws A-6 B
22 Lever F/R Locking Tab A-6 B
21, 22 23 Clutch Assembly D37 Washer A-6 B
24 Gear Drive/Gear Cam Washer/Hook A-7 B
25 Gear Sector Hook A-7 B
21 26 Brake Assembly Capstan Chassis Hole A-7 B
21,22,23, 27 Plate Slider Chassis Guide A-7 B
24,2526
21,22,23, 28 Lever Tension 1 Hook A7 B
24,2526,27
21,22,23, 29 Lever Spring 1 Hook A-7 B
24,2526,27
21,22,23, 30 Lever Brake 1 Hook A-7 B
24,2526,27
25 31 Gear Assembly P2/ Bass A-8 B
Gear Assembly P3
2, 3, 14, 32 Base Assembly P2 6 Chasses A-8 B
25, 31 /Base Assembly P3
25, 31 33 Base Loading 3 Hooks A-8 B
2,3,14 34 Base Tension Chassis Embossing A-9 T
35 Arm Assembly Idler Jog Locking Tab A-9 T
Parts firstly Disassembled
Order Of Dis-
assembled
Part Fixing Type
Ref.
Draw-
ings
Posi tion
NOTE : Assembly order is a reverse of
disassembly order.
(1) For assembly, check the assembly mode is accurate. (2) Parts firstly disassembled indicate parts firstly disassem-
bled in disassembly of related parts.
T:Top, B:Bottom
9
2
6
11
1
33 14
15
4
3
5
10
8 12 18
16 17
19
7
35
13 15
4-2
DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM
Cap, FPC
Drum Assembly
Cable Flat
(S1)
(S1)
(S1)
Holder FPC
H1
H2
1. Disassembly of Drum Assembly (Figure A-1)
1) Separate cable flat from the Drum FPC and the Capstan
Motor.
2) Release 3 screws (S1) on the bottom side of the chassis,
and separate the drum assembly.
3) Release the hooks (H1, H2) and separate both the holder
FPC and the Cap FPC (disassemble if necessary).
Fig. A-1
Cautions in assembly of FPC
Holder FPC
Drum FPC
Cap FPC
Assembly shape seen in the reverse direction
4-3
DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM
(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)
4-4
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.
DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM
(C')
(C)
(B')
(B)
Holder Assembly CST
(D)
Chassis
Gear Rack F/L
Gear Drive
Chassis
(H4)
4-5
DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM
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)
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)
4-7
DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM
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)
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)
4-9
DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM
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
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)
4-11
DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM
(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)
4-12
DECK MECHANISM ADJUSTMENT
• Fixtures and Tools for Service
1. Cassette Torque Meter SRK-VHT-303(Not SVC part) Part No:D00-D006
4. Torque gauge adaptor Part No:D09-R001
5. Post height adjusting driver Part No:DTL-0005
6. + Type driver (ø5)
2. Alignment tape Part No NTSC:DTN-0001 PAL:DTN-0002
3. Torque gauge 600g.Cm ATG Part No:D00-D002
SRK
VIDEO
CASSETTE
TORQUE
METER
VHT-303
S
R
K
-
V
H
T
-
S
S
R
K
-
V
H
T
-
T
300
250
200
150
50
0
300
250
200
150
50
0
100
4-13
Purpose of adjustment : To make tools normally operate by positioning tools accurately.
DECK MECHANISM ADJUSTMENT
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
4-14
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:
• Torque Gauge (600 g.cm ATG)
• Torque Gauge Adaptor
• Cassette Torque Meter SRK-VHT-303
• Play (FF) or Review (REW) Mode
• Try to operate the VCR (VCP) per mode with the tape not inserted (See ‘2. Prior Preparation for Deck Adjustment).
• Measure after adhering and fixing the torque gauge adaptor to the torque gauge (Fig. C-3-1)
• Read scale of the supply or take-up part of the cassette torque meter (Fig. C-3-2).
DECK MECHANISM ADJUSTMENT
1) Take the power cord from the consent.
2) Separate the top cover and the plate assembly top.
3) Insert the power cord into again.
4) Turn the VCR (VCP) on and load the cassette while push­ing the lever stopper of the holder assembly CST back­ward. In this case, clog both holes on the housing rail part of chassis to prevent detection of the end sensor.
If doing so, proceeding to the stop mode is done. In this status, input signals of all modes can be received. However, operation of the Rewind and the Review is impossible since the take-up reel remains at stop status and so cannot detect the reel pulse (however, possible for several seconds).
2. Previous Preparation for Deck Adjustment
(Preparation to load the VCR (VCP) with cassette tape not inserted)
3. Torque Measuring
NOTE
Adhere the torque gauge adaptor to the torque gauge for measuring the value.
SRK
V
ID
E
O
C
A
S
S
E
T
T
E
T
O
R
Q
U
E
M
E
T
E
R
V
H
T
-3 0
3
S
R
K
-
V
H
T
-
S
S
R
K
-
V
H
T
­T
3
0
0
2
5
0
2
0
0
1
5
0
5
0
0
3
0
0
2
5
0
2
0
0
1
5
0
5
0
0
1
0
0
Fig. C-3-2Fig. C-3-1
Torque Gauge
Torque Gauge Adaptor
Reel Table
Item
Fast forward Torque
Rewind Torque
Play Take-Up Torque
Review Torque
Fast Forward
Rewind
Play
Review
Torque Gauge
Torque Gauge
VHT-303
VHT-303
Take-Up Reel
Supply Reel
Take-Up Reel
Supply Reel
More than 400g°cm
More than 400g°cm
40~100g°cm
120~210g°cm
Mode Instruments Reel Measured Measuring Value
• Cassette Torque Meter (SRK-VHT-303)• Torque Gauge (600g.cm ATG)
VCR (VCP) status Measuring methodFixtures and tools used
4-15
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
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
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
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