LG LRY-517 Service manual
VCR+DVD RECORDER
SERVICE MANUAL
MODEL : LRY-517(RC7793CML)
CAUTION
BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”
IN THIS MANUAL.
MODEL : LRY-517(RC7793CML)SERVICE MANUAL
P/NO : 3829RGN004H APRIL,2005
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
UP-DATING PROGRAM ........................................................................................................... 1-5
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 LG 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 LG 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.)
1-4
THE STEPS FOR CHANGE THE OPTION CODE
Push Switch POWER ON/ OFF
at remocon or timer keyborad
Select DVD MODE at the set
use remocon or timer keyborad
Push REC+ PLAY
at timer keyboard
Use remocon and push ENTER
Use Direction Key at
remocon (LEFT/ RIGHT)
for select the position of option
Use Direction Key
at remocon (UP/ DOWN)
for change the option
After finish edit code of option
push ENTER at remocon
For finishing and intialized
the option code push
REC + EJECT at remocon
Note : This procedure must be done when IC304(On digital Board) or Digital Boardassy
LRY-517
NAME HEX
OPT1 F2
OPT255
OPT353
OPT4 FD
OPT5 17
OPT6 0C
OPT7 21
OPT8 00
Press “Enter” key
to Save and Exit
DETECT NEW EEPROM (OPTION EDIT SCREEN)
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 120V, 60 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 NTSC color system
Recording format NTSC
System
Laser Semiconductor laser, wavelength 650 mm
Video head system Double azimuth 4 heads, helical scanning
Signal system NTSC
Recording
Recording format DVD+RW/+R Video format
Recordable discs DVD-ReWritable, DVD-Recordable, DVD+ReWritable, DVD+Recordable
Recordable time Approx. 1 hour (XP mode), 2 hours (SP mode), 4 hours (LP mode),
6 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
Harmonic distortion Less than 0.008% (AUDIO OUT connector)
Dynamic range More than 95 dB (AUDIO OUT connector)
Inputs
RF IN RF input, 75 ohms
VIDEO IN 1.0 Vp-p 75 ohms, sync negative, RCA jack
AUDIO IN 0 dBm more than 47 kohms, RCA jack (L, R)
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
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 (analog audio) 2.0 Vrms (1 KHz, 0 dB), 600 Ω, RCAjack (L, R) x 1
* Design and specifications are subject to change without notice.
* Manufactured under license from Dolby Laboratories. “Dolby”, “Pro Logic” 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. Packing Accessory Section ....................................................................................................2-4
2-2
EXPLODED VIEWS
1. Cabinet and Main Frame Section
463
250
463
463
A00
265
A46
469
321
323
276
465
261
320
300
257
255
469
A47
A60
A26
A26A
290
7
45
7
45
291
459
469
A52
A54
256
457
A48
470
468
469
263
A50
457
A43
274
264
266
284
283
260
286
469
285
280
261
261
452
A44
2-3
2. 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
INSTRUCTION ASSEMBLY
801
803
804
P
ACKING
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. AVCP BLOCK DIAGRAM ......................................3-22
3. SYSTEM BLOCK DIAGRAM.................................3-24
4. JACK BLOCK DIAGRAM ......................................3-26
5. STUNER/MTZ BLOCK DIAGRAM.........................3-28
6. AVCP 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. JACK CIRCUIT DIAGRAM
(SCART MODEL ONLY) ........................................3-42
7. TIMER CIRCUIT DIAGRAM ..................................3-44
• WAVEFORMS .........................................................3-46
• CIRCUIT VOLTAGE CHART ...................................3-48
PRINTED CIRCUIT DIAGRAMS .........................3-50
1. VCR P.C.BOARD...................................................3-50
2. SMPS P.C.BOARD ...............................................3-52
3. JACK P.C.BOARD ................................................3-54
4. HDD P.C.BOARD...................................................3-55
5. KEY P.C.BOARD .................................................3-56
6. TIMER P.C.BOARD .............................................3-56
VDR PART
VDR ELECTRICAL TROUBLESHOOTING
GUIDE
...........................................................................3-58
1. POWER(SMPS) CIRCUIT .....................................3-58
2. NO COMPONENT VIDEO SIGNAL WHEN
PLAYING DISC......................................................3-60
3. NO COMPOSITE / S-VIDEO SIGNAL WHEN
PLAYING DISC......................................................3-61
4. NO TV, EXTERNAL INPUT VIDEO SIGNAL.........3-62
5. WHEN PLAYING DISC, NO AUDIO OUTPUT ......3-63
6. NO TUNER AUDIO OUTPUT ................................3-63
7. NO OPTICAL / DIGITAL OUTPUT ........................3-63
8. NO EXTERNAL INPUT 1, 2 AUDIO......................3-64
9. NO EXTERNAL INPUT 3 AUDIO ..........................3-64
BLOCK DIAGRAMS................................................3-65
1. VDR SET TOTAL BLOCK DIAGRAM....................3-65
2. VDR MAIN H/ W BLOCK DIAGRAM .....................3-66
3. POWER BLOCK DIAGRAM..................................3-67
4. AUDIO IN/ OUT BLOCK DIAGRAM ......................3-68
5. CPU & CONTROL REGISTER
BLOCK DIAGRAM.................................................3-69
6. VIDEO IN/ OUT BLOCK DIAGRAM ......................3-70
7. DV 1394 IN/OUT BLOCK DIAGRAM ....................3-71
8. MEMORY CARD IN/ OUT BLOCK DIAGRAM ......3-72
CIRCUIT DIAGRAMS..............................................3-73
1. BGA 308P CIRCUIT DIAGRAM.............................3-73
2. DDR & B TO B CONNECTOR
CIRCUIT DIAGRAM ..............................................3-75
3. POWER, FLASH, CONNECTOR CIRCUIT
DIAGRAM ..............................................................3-77
4. RST, CONTROL/STATUS_REG., ATAPI,
HOST_CPLD, LATCH CIRCUIT DIAGRAM ..........3-79
5. VIDEO_IN, VIDEO_OUT CIRCUIT DIAGRAM......3-81
6. DV1394, HDMI CIRCUIT DIAGRAM .....................3-83
7. AUDIO IN/OUT CIRCUIT DIAGRAM .....................3-85
• WAVEFORMS .........................................................3-87
• CIRCUIT VOLTAGE CHART ...................................3-89
PRINTED CIRCUIT DIAGRAMS .........................3-91
1. VDR P.C.BOARD(TOP VIEW) ...............................3-91
2. VDR P.C.BOARD(BOTTOM VIEW) .......................3-93
3-2
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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
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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
OVERALL WIRING DIAGRAMS
3-3
ELECTRICAL ADJUSTMENT PROCEDURES
1. Servo Adjustment
1) PG Adjustment
• Adjustment And Specification
• Test Equipment
a) OSCILLOSCOPE : NTSC 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 (14V - 17V)
supplied to IC101 Pin7?
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 Pin18?
Do the T-UP Reel Pulses
appear at IC501 Pin80?
Is 12V applied to PMC01
Pin8?
Check the Drum Motor
signal.
Check the Power Circuit.
Check the power.
Is 5.0V applied to the
R531?
Refer to SMPS 5.3VA
troubleshooting.
Check IC501
Pins22, 23, 24, 25.
Does 5.0V appear at the
RS501?
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 Pin58 during
inserting the CST ?
Does the “L” signal appear
at IC501 Pin10 while
inserting the CST?
Check the Deck
Mechanism.
Note :
Auto stop can occur because Grease or Oil has dried up
YES
YES YES
YES
YES
YES
NO
NO
NO
NO
NO
NO NO
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 Pin97?
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 pin87?
On tracking, do the CTL
pulses move?
Does the Video Envelope
waveform appear at IC501
Pin9?
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 90 and PMC01
Pin11 shorted?
Replace the IC501.
Refer to “(2)
No 12VA of Power section”
Do the Drum PWM Pulses
appear at IC501 Pin76?
Aren’t 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
VCR ELECTRICAL TROUBLESHOOTING GUIDE
3-9
Does the CFG signal appear at
PMC01 Pin1?
Does the PWM signal appear at IC501
Pin77?
Does 2.8V appear at PMC01 Pin9?
Check the PMC01 and the Capstan
Motor Ass’y.
Does the Capstan PWM signal appear at
IC501 Pin77?
Aren’t the foil patterns and Components
between IC501 Pin77 and PMC01
Pin9 short?
Does the CFG signal come into IC501
Pin87?
Aren’t the foil patterns and Components
between IC501 Pin77 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
Pin99?
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 Tuner Part
Is REG 5.0V applied to
IC301Pins4, 22, 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
Q310, Q605.
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 IC601
Pin4?
Check PMD02 Pin5 and
IC601 Pin4
YES
NO
NO
Replace IC601?
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, 47, 50, 52, 60, 84, 92?
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 R342)
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.
Does the Y(Luminance)
RF signal appear at
IC301 Pin33?
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
Pins22, 47, 50, 52, 60, 84, 92.
Does the Color signal
appear at IC301
Pin29?
Check the line of the 5.0V
5.3VA Line. (Power Circuit)
Replace the X301.
Check the Color Pass.
Does the X301
(3.58MHz) osxillate?
Replace the IC301.
Does the Color signal
appear at IC301 Pin42?
Replace the IC301.
NO
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 Pin74)
Replace the IC301.
Is the REC ‘H’ signal
(about 4V) applied to the
OSC?
Check the circuit of the
IC301 Pin86, 90.
Check REC Luminace
pass & Color pass.
Does the REC RF signal
appear at the IC301
Pins86, 90?
NO
YES
Is 5.0V 5.3VA applied to
the IC301 Pins22, 47, 50,
52, 60, 84, 92?
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 DVD Audio of IC801
Pins2, 4.
Check the 74 Audio of IC801
Pins48.
Check the Vcc of IC801 Pins25, 40, 51,
58.
YES
Check the IIC Clock and DATA at
IC801 Pins42, 43.
YES
YES
Check the Audio of IC801 Pins53, 57.
Check the SC901, JK601.
Check the DVD Audio out.
NO
Check the Tuner Part
NO
Check the Power 5.0V, 12V.
YES
NO
Check the IC501 Pins71, 72.
NO
Replace IC801.
NO
Check the Audio of PMD02 Pin19, 21.
Check the Pcb Pattern between IC801
Pin53, 57 with PMD02 Pin19, 21.
NO
YES
YES
Check the Audio of PMD02 Pin23, 25. Check the DVD Board Audio path.
NO
Check the AV1 Audio of IC801
Pins9, 14.
Check the AV1 Jack.
NO
Check the AV2 Audio of IC801
Pins10, 15
Check the AV2 Jack.
NO
3-16
VCR ELECTRICAL TROUBLESHOOTING GUIDE
3. Y/C CIRCUIT
(2) Hi-Fi Playback
YES
YES
YES
YES
YES
NO
YES
NO
PB mode
No Sound.
Check the Vcc of IC801
(Pins25, 40, 51, 58)
Check the Hi-Fi Selection switch.
(IC801 Pin41) and the Tape quality.
Is the RF Envelope at IC801
Pin30 over 300mVp-p?
Check IC801 Pin42(Data),
Pin43(Clock)
YES
Do Audio Signals appear at
IC801 Pin22(L-CH), 24(R-CH)?
YES
Do Audio Signals appear at
IC802 Pin53(L-CH), 57(R-CH)?
YES
Check the Audio of
PMD02 Pins19, 21
YES
Check the Audio of
PMD02 Pins23, 25
YES
Check the JK601
Check Power 5.0V, 12V.
NO
Check IC501 Pin27
(A.H/SW)
NO
Is Pin29 of IC801 over
3.5V
Check Rec ‘H’ signal of
µ-com.
NO
Is the head Switching signal
IC801 Pin27 ok?
YES
Is the head Switching signal
IC801 Pin27 ok?
Check the parts of µ-COM
(IC501 Pins17, 18)
NO
Check the Connection at
P3D01 Pins7, 9.
NO
Replace IC801.
NO
Check the PCB pattern between IC801
Pins3, 5, 7 with PMD02 Pins19, 21
NO
Check the DVD Board
Audio Part
NO
3-17
(3)
Hi-Fi REC.
It can’t be recorded Hi-Fi Audio
signal.
Check Vcc of IC801. (Pins25, 40, 51, 58)
YES
YES
Check IC801 Pin42(Data), Pin43(CLOCK).
YES
Do Audio signals appear at IC801
Pins53, 57?
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 71, 72)
Check Audio input signal of IC801
Pins2, 4, 9, 10, 14, 15, 48.
NO
Replace IC801.
NO
NO
VCR ELECTRICAL TROUBLESHOOTING GUIDE
3-18
VCR ELECTRICAL TROUBLESHOOTING GUIDE
7. Tuner/IF CIRCUIT
(A)
No Video on TV screen.
Is Tuner mode selected?
YES
changer to Tuner mode using remocon.
NO
Is “TV” displayed on FLD displayed
YES
Is +5V applied to TU701 Pin 3?
NO
Is “High” applied to TU701 Pin 4?
YES
Does the Video signal appear at Pin 16
of TU701?
YES
Replace TU701
YES
Set TV/VCR SW to VCR using remocon.
YES
Check 5V Line.
NO
Check the voltage at Pin26 of IC501.
(“H” for tuner mode)
NO
Check the path form Pin23 of IC601
to the Pin 5 of TU701.
NO
3-19
VCR ELECTRICAL TROUBLESHOOTING GUIDE
(B)
No TV sound.
Check the Vcc of IC801(Pin58).
YES
Check Power (Vcc 12V)
NO
Check IC801 Pin 43(DATA),
Pin 42(CLOCK) “HIGH”?
YES
Check IC801 Pin 48(TUNER SIF).
NO
Replace IC801.
YES
Check IC501 Pin 71(CLOCK),
Pin 72(DATA)
YES
Check TU701 Pin 13
(TUNER Audio Output)
NO
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