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

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 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

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

(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

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

A52

283

A54

284

274

457

A48

468

266

264

263

260

A00

265

465

261

320

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

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

ACKING

CABLE ASS'Y

OPTIONAL PARTS

806

CABLE(COAXIAL)

811

PLUG ASS'Y 1WAY

812

PLUG ASS'Y 2WAY

821

SCART CABLE

INSTRUCTION ASSEMBLY

801

803

804

ACKING

BAG

802

BOX CARTO

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

987654321

SPD.F

GND

INTR/PROG

GND

RADIO'H'

AMP ON

VDR REDET

VDR CLK

DATA(VCR-VDR)

DATA(VDR-VCR)

VDR ENA

AMP CLK

AMP RX

AMP TX

AMP READY

AMP MUTE

1514131211

987654321

P6603

P6602

PM601PN302

PN302

PN301

PMD01PMD02

PN304

CON401

PPM01

P101

P3D01P3D03

P104

P103

P104

P3D02

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

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)

(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?

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

Is the Vcc (11V - 18V) supplied to IC101 Pin2?

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?

Replace the D132

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

YES

NO VFD

Check or Replace the R107

Is the R107 Normal?

Is the D128 Normal?

Check or Replace the D128

Check or Replace the ZD151

YES

Is the ZD151 Normal?

Check or Replace the D127

YES

No 33V

Check or Replace the D130

Is the Vcc(33V) supplied to Q123 Emittor?

Is the Q123 Base ‘H’?

Check the ‘PWR CTL “H”’signal from µ-com

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?

Check or Replace the ZD153

Check the ‘HSR “H” signal from µ-com

Check or Replace the Q121/Q122 & 33V line

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

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

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.

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,

YES

When the Capstan Motor doesn’t run,

Does 12VA appear at PMC01?

YES

Replace the IC501.

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.

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

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

Does the Video signal appear at the IC802 Pin29?

IC802 Pins2, 4(Vcc), Pins32, 33(I

C BUS)

YES

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

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.

YES

Replace the IC301.

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.

YES

Is the Color Rotary signal applied to the IC301 Pin70?

Check the Color Rotary Circuit. (IC501 Pin98)

YES

Is Color Rotary “H” about

3.4V?

Check the Color Rotary level. (Check the R303)

YES

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?

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)

YES

Does PB Mode operate nomally?

Check PB Mode.

YES

Check the Drum & Drum

Connector

YES

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

Check the Audio of IC801 Pins16, 17.

Check the SC901, JK901.

Check the Scart1 Jack. (SC901 Scart1 Audio in Pin2, 6).

Check the Scart2 Jack. (SC901 Scart2 Audio in Pin2, 6).

Check the front Jack.

Check the Power 5.0V, 12V.

YES

Check the IC501 Pins59, 60.

Replace IC801.

Check the Audio of PMD02 Pin19, 21.

Check the Pcb Pattern between IC801

Pin16, 17 with PMD02 Pin19, 21.

YES

Check the Audio of PMD02 Pin23, 25. Check the DVD Board Audio path.

Check the TU Audio of IC801 Pins2, 3.

Check the IC751 Pin30, 31.

Check the DVD Audio of IC801 Pins4, 5.

Check the DVD Audio OUT. (JK902 DVD_A_L_L/R).

3-16

VCR ELECTRICAL TROUBLESHOOTING GUIDE

3. Y/C CIRCUIT

(2) Hi-Fi Playback

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.

Check IC501 Pin26 (A.H/SW)

Check the parts of µ-COM (IC501 Pins17, 18)

Check the Connection at P3D01 Pins7, 9.

Check the Audio PMD02 Pin23, 25.

Check the Jack(JK901, SC901)

Check the DVD Board Audio Path

3-17

(3)

Hi-Fi REC.

It can’t be recorded Hi-Fi Audio signal.

Check Vcc of IC801. (Pins34. 40)

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.

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).

Replace IC801.

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?

Does the video signal at the PMD02 Pin5?

Does the Video signal at the IC802 Pin 29.

Does the Video signal at the IC901 Pin 23.

Check 33V line.

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.

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.

YES

Does the Video signal at the IC301 Pin15.

Check the Pattern between IC802 Pin31 and IC301 Pin15.

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.

Check the Tuner SiF signal at IC751 Pin2.

YES

Check the oscillator of IC751 Pins5, 6.

YES

Check the Audio of IC751 Pins30, 31.

YES

Check the Audio of IC801 Pins2, 3.

YES

Check the Audio of IC801 Pins16, 17.

YES

Check the Tuner SIF of TU701 Pin16.

Replace X751

Check the IIC Clock and Data at IC751 Pins12, 13.

Check the signal flow from IC751 Pins30, 31 to IC801 Pins2, 3.

Check the IIC Clock and Data at IC801 Pins42, 43.

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.

3-20 3-21

BLOCK DIAGRAMS

1. POWER(SMPS) BLOCK DIAGRAM

101

NOISE FILTER

BLOCK (C101,L102, L101, C102)

FUSE (F101)

BR BL

(BK)(WH)

Y-CAP C110

TH01

C103

Y-CAP

111

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

(IC104, D104, R113,

C117,C114)

T101

12)

PHOTO COUPLER

C102)

102

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)

5.0V S/W B l ock D134,C134

HSR CTL Block

PWR CTL Block

)

TO VCR

(P101)

5.3VA

5.0V

Cap Vc

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

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