LG LHY-518 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 ...................................................................................................................... 1-5

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 DVD Recorder Combi Receiver 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 DVD Recorder Combi Receiver 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 DVD Recorder

Combi Receiver 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 DVD Recorder Combi

Receiver and / or any of its electrical assemblies unless all solid-state 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

NAME HEX BINARY OPT1 F2 00000000 OPT2 55 00000000 OPT3 53 00000000 OPT4 5D 00000000 OPT5 17 00000000 OPT6 0C 00000000 OPT7 20 00000000 OPT8 00 00000000 Press “Enter” key to Save and Exit

DETECT NEW EEPROM (OPTION EDIT SCREEN)

1-5

SPECIFICATIONS

GENERAL

Power requirements AC 120V, 60 Hz Power consumption 35W Dimensions (approx.) 435 X 81 X 358 mm (17.1 x 3.2 x 14.1 inches) (w x h x d) Mass (approx.) 5.54 kg (12.21 lbs) Operating temperature 5°C to 35°C (41°F to 95°F) Operating humidity 5 % to 90 % Signal system NTSC

RECORDING

Recording format DVD VideoRecording, DVD-VIDEO Recordable discs DVD-ReWritable, DVD-Recordable, DVD+ReWritable, DVD+Recordable Recordable time DVD ; Approx. 1 hour (XP mode), 2 hours (SP mode),

4 hours (LP mode), 6 hours (EP mode)

VCR ; SP: 2 HOURS (T-120), SLP: 6 HOURS (T-120)/8 HOURS (T-160)

Video recording format

Sampling frequency 27MHz Compression format MPEG 2

Audio recording format

Sampling frequency 48kHz, 96kHz Compression format Dolby Digital

VCR SPECIFICATIONS

Head system Four head helical scan azimuth system Timer 12-hour display type with AM, PM Tape speed SP: 33.35 mm/sec, LP: 16.67 mm/sec, SLP: 11.12 mm/sec Tape width 12.7 mm Rewind time About 65 seconds (T-120) Antenna 75 ohms (VHF/UHF) VHF output signal Channel 3 or 4 (Switchable) Channel coverage VHF: 2-13, UHF: 14-69, CATV: 1-125 (4A, A-W, W+1 - W+84, A-5 - A-1) Frequency range 20Hz to 20kHz Signal-to-noise ratio 43dB Dynamic range 88 dB Channel separation 60 dB

DVD SPECIFICATIONS

Laser system Semiconductor laser, wavelength 650 nm Frequency response DVD (PCM 48 kHz): 8 Hz to 22 kHz, CD: 8 Hz to 20 kHz Signal-to-noise ratio More than 95dB Harmonic distortion Less than 0.008% Dynamic range More than 90 dB

TUNER SPECIFICATIONS

Tuning Range (FM) 87.5 - 108 MHz Intermediate Frequency (FM) 10.7 MHz Signal-to-noise ratio 60 dB (Mono) Tuning Range (AM) 530 - 1,720 kHz Intermediate Frequency (AM) 450 kHz Antenna Wire antenna (FM)

Loop antenna (AM)

AMPLIFIER

Power consumption 110W Stereo mode 125W + 125W (4Ω at 1 kHz, THD 10 %) Surround mode Front: 125W + 125W (THD 10 %)

Center*: 125W Surround*: 125W + 125W (4Ω at 1 kHz, THD 10 %) Subwoofer*: 180W (3Ω at 30 Hz, THD 10 %)

Max Power Front/Center/Surround: 180W

Woofer: 300W

(* Depending on the sound mode

settings and the source, there may be no sound output.)

1-6

INPUTS

ANTENNA IN Antenna or CATV input, 75 ohms VIDEO IN (AV1,2) 1.0 Vp-p 75 ohms, sync negative, RCA jack x 2 AUDIO IN (AV1,2) -6 dBm more than 47 kohms, RCA jack (L, R) x 2 S-VIDEO IN (Y) 1.0 V (p-p), 75 Ω, negative sync, Mini DIN 4-pin x 1

OUTPUTS

VIDEO OUT 1 Vp-p 75 Ω, sync negative, RCA jack x 1 S-VIDEO OUT (Y) 1.0 V (p-p), 75 Ω, negative sync, Mini DIN 4-pin x 1

(C) 0.286 V (p-p) 75 Ω COMPONENT VIDEO OUT (Y) 1.0 V (p-p), 75 Ω, negative sync, RCA jack x 1 (PROGRESSIVE SCAN) (Pb)/(Pr) 0.7 V (p-p), 75 Ω, RCA jack x 2 Audio output (analog audio) 1.1 Vrms (1 kHz, -6 dB), 600 Ω, RCA jack (L, R) x 2 RF OUT Channel 3 or 4 (Switchable)

SPEAKERS

Front (LHS-95PAF)

Type: 1 Way 2 Speaker Impedance: 4 Ω Frequency Response: 80 - 20,000 Hz Sound Pressure Level: 85 dB/W (1m) Max Input Power: 180W Net Dimensions (WxHxD): 269.5 x 1200 x 269.5 mm Net Weight: 2.9 kg

Center (LHS-95PAC)

Type: 1 Way 2 Speaker Impedance: 4 Ω Frequency Response: 80 - 20,000 Hz Sound Pressure Level: 85 dB/W (1m) Max Input Power: 180W Net Dimensions (WxHxD): 448 x 85 x 105 mm Net Weight: 1.2 kg

Satellite (LHS-95PAS)

Type: 1 Way 1 Speaker Impedance: 4 Ω Frequency Response: 100 - 20,000 Hz Sound Pressure Level: 85 dB/W (1m) Max Input Power: 180W Net Dimensions (WxHxD): 120 x 223 x 151 mm Net Weight: 1.1 kg

Active Subwoofer (LHS-95PAA)

Type: 1 Way 1 Speaker Impedance: 3 Ω Frequency Response: 35 - 1,500 Hz Sound Pressure Level: 83 dB/W (1m) Max Input Power: 300W Net Dimensions (WxHxD): 295 x 432 x 414 mm Net Weight: 14 kg

Accessories:

Video cable x 1, Audio cable x 1, RF 75-ohm Coaxial Cable x 1, System cable x 1, Speaker cable x 5, FM Antenna cable x 1, AM Antenna cable x 1, Remote control x 1, Batteries (AAA) x 2, Ferrite core x 1

2-1

SECTION 2

EXPLODED VIEWS

CONTENTS

EXPLODED VIEWS .....................................................................................................................2-2

1. Cabinet and Main Frame Section ...........................................................................................2-2

2. Deck Mechanism (RL-02A)......................................................................................................2-3

3. Woofer Speaker Section(LHS-95PAA) ...................................................................................2-4

4. Center Speaker Section(LHS-95PAC) ....................................................................................2-5

5. Rear Section(LHS-95PAS)......................................................................................................2-6

6. Front Speaker Section(LHS-95PAF).......................................................................................2-7

7. Packing Accessory Section ....................................................................................................2-4

2-2

EXPLODED VIEWS

1. Cabinet and Main Frame Section

BCD

473

OPTIONAL PART

463

250

252

300

A46

251

473

463

469

467

278

A50

469

A60

286

A52

322

283

284

A47

255

469

467

256

467

A54

A48

274

279

257

462

A00

469

253

472

264

321

322

457

263

469

276

462

A44

457

265

261

320

261

A43

285

280

282

266

273

452

260

281

261

467

2-3

2. Deck Mechanism Section (RL-02A)

1434

1026

1435

1015

1003

1005

1016

1001

1013

1014

A001

1002

1434

1012

1019

1009

1038

1024

1011

1432

1028

1019

1025

1027

1433

A000

1029

1432

1033

1030

1021

A60

1025

1027

1432

1032

1432

1017

A004

1436

1018

1018A

1018B

1018C

1018E

1018D

1044

1434

1006

1043

1020

1042

A002

1042

1434

1045

1041

1434

2-4

3. Woofer Speaker Section(LHS-95PAA)

950

A900

952

961

953

959

A46A

A47A

263A

A52A

474

264A

310

955

958

956

951

957

2-5

4. Center Speaker Section(LHS-95PAC)

A700

754

752

758

757

750

751

755

756

755

751

754

2-6

5. Rear Section(LHS-95PAS)

655

A600

650

651

652

653

654

656

657

658

659

2-7

6. Front Speaker Section(LHS-95PAF)

850

851

852

858

857

853

859

854

850

856

893

890

891

892

894

2-8

7. Packing Accessory Section

810

822

CABLE, COAXIAL

CABLE ASS'Y

811

OPTIONAL PARTS

806

CABLE(COAXIAL)

PLUG ASS'Y 1WAY

826

808

900

803

FILTER

BATTERY

REMOCON

ACKING

812

824

INSTRUCTION ASSEMBLY

801

PLUG ASS'Y 2WAY

ANTENNA LOOP(AM)

825

ANTENNA (FM)

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. OSD CIRCUIT .......................................................3-10

5. Y/C CIRCUIT..........................................................3-11

6. TUNER/IF CIRCUIT...............................................3-15

7. Hi-Fi CIRCUIT........................................................3-17

BLOCK DIAGRAMS................................................3-20

1. POWER(SMPS) BLOCK DIAGRAM......................3-20

2. TUNER/MTZ BLOCK DIAGRAM ...........................3-22

3. Y/C BLOCK DIAGRAM ..........................................3-24

4. NORMAL AUDIO BLOCK DIAGRAM ....................3-26

5. JACK BLOCK DIAGRAM ......................................3-28

6. Hi-Fi BLOCK DIAGRAM ........................................3-30

7. SYSTEM BLOCK DIAGRAM.................................3-32

CIRCUIT DIAGRAMS..............................................3-34

1. POWER(SMPS) CIRCUIT DIAGRAM ...................3-34

2. TU/IF CIRCUIT DIAGRAM ....................................3-36

3. A/V CIRCUIT DIAGRAM........................................3-38

4. JACK CIRCUIT DIAGRAM ....................................3-40

5. Hi-Fi CIRCUIT DIAGRAM ......................................3-42

6. SYSTEM CIRCUIT DIAGRAM...............................3-44

7. TIMER CIRCUIT DIAGRAM ..................................3-46

8. FRONT / I/O CIRCUIT DIAGRAM .........................3-48

• WAVEFORMS .........................................................3-50

• CIRCUIT VOLTAGE CHART ...................................3-52

PRINTED CIRCUIT DIAGRAMS .........................3-54

1. VCR P.C.BOARD...................................................3-54

2. POWER P.C.BOARD ............................................3-56

3. JACK P.C.BOARD ................................................3-56

4. KEY P.C.BOARD ..................................................3-58

5. TIMER P.C.BOARD ..............................................3-58

DVR PART

ELECTRICAL TROUBLESHOOTING GUIDE & WAVEFORMS

........................................3-60

1. POWER(SMPS) CIRCUIT .....................................3-60

2. NO COMPONENT VIDEO SIGNAL WHEN

PLAYING DISC ......................................................3-61

3. NO COMPOSIT / S-VIDEO SIGNAL WHEN

PLAYING DISC ......................................................3-62

4. NO TV, EXTERNAL INPUT VIDEO SIGNAL.........3-63

5. WHEN PLAYING DISC, NO AUDIO OUTPUT ......3-64

6. NO TUNER AUDIO OUTPUT ................................3-64

7. NO OPTICAL / DIGITAL OUTPUT ........................3-64

8. NO EXTERNAL INPUT 1 AUDIO ..........................3-65

9. NO EXTERNAL INPUT 2 AUDIO ..........................3-65

BLOCK DIAGRAMS ..............................................3-66

1. DVR MAIN H/W BLOCK DIAGRAM ......................3-66

2. POWER BLOCK DIAGRAM ..................................3-67

3. AUDIO IN/ OUT BLOCK DIAGRAM ......................3-68

CPU & CONTROL REGISTER BLOCK DIAGRAM

...3-69

5. VIDEO IN/ OUT BLOCK DIAGRAM ......................3-70

6. DV 1394 IN/OUT BLOCK DIAGRAM ....................3-71

7. 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. DVR P.C.BOARD(TOP VIEW)...............................3-91

2. DVR P.C.BOARD (BOTTOM VIEW)......................3-93

WOOFER PART

ELECTRICAL TROUBLESHOOTING GUIDE & WAVEFORMS

........................................3-97

BLOCK DIAGRAMS................................................3-98

1. BLOCK DIAGRAM_1 .............................................3-98

2. BLOCK DIAGRAM_2 ...........................................3-100

CIRCUIT DIAGRAMS............................................3-102

1. SMPS-WIDE CIRCUIT DIAGRAM.......................3-102

2. AMP CIRCUIT DIAGRAM....................................3-104

3. MICOM & DSP CIRCUIT DIAGRAM ...................3-106

4. DSP CIRCUIT DIAGRAM ....................................3-108

5. I/O CIRCUIT DIAGRAM .......................................3-110

PRINTED CIRCUIT DIAGRAMS .......................3-112

1. MAIN & WOOFER P.C.BOARD (TOP VIEW)......3-112

2. MAIN & WOOFER P.C.BOARD

(BOTTOM VIEW) ................................................3-114

3. POWER P.C.BOARD (TOP VIEW)......................3-116

4. I/O P.C.BOARD (TOP VIEW)...............................3-117

OVERALL WIRING DIAGRAM

3-2

DIGEST

DVD AUDIO'R'

DVD AUDIO'L'

VOLUME DOWN

VOLUME UP

8.7V1

12VA(DRUM)

GND

L/M CONTROL

DRUM(L/M)VCC S.GND

V_LIMIT

CAP.VCC

3-3

ELECTRICAL ADJUSTMENT PROCEDURES

1. Servo Adjustment

1) PG Adjustment

• Adjustment And Specification

• Test Equipment a) OSCILLOSCOPE b) NTSC MODEL : 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(W5D1, W5D2) signal to the starting point of the vertical synchronized signal, to 6.5H ± 0.5H (412µs, 1H=63.5µs).

• PG Adjustment Method

a-1) Playback the SP standard tape b-2) Press the “ENTER” key on the Remote controller and the “REC” key on the Front Panel at the same

time, then it goes into Tracking initial mode. < 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(W5D1, W5D2)

R/C TRK JIG KEY 6.5 ± 0.5H

MEASUREMENT POINT ADJUSTMENT POINT SPECIFICATION

H/SW

(W5D1, W5D2)

(VCR

VIDEO)

(CH2)

(CH1)

OSCILLOSCOPE

CH1 CH2

R/C KEY

H/SW

(W5D1, W5D2)

VCR BOARDVDR BOARD

"VCR VIDEO" TP

VCR PART

H/SW

Composite

VIDEO

6.5H(412µs)

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 R101 Normal?

Is the BD101 Normal?

Replace the BD101

Replace the R101

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

VCR ELECTRICAL TROUBLESHOOTING GUIDE

3-5

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 SW30 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.

Does 5V appear at the RS501?

Check the Q124 Power Circuit.

Refer to “SMPS DRUM 12 Volt Trouble Shooting”.

Is 5V applied to R531 ?

Refer to SMPS 5.3VA troubleshooting.

Check IC501 Pins22, 23, 24, 25.

Do T/UP Reel Pulses appear at the point between R556 and R536?

Replace the T/UP Reel Sensor (RS501).

Check the CST SW and the peripheral circuitry.

Replace the IC501.

The unstable loading of a Cassette tape

Does the “H” signal appear at IC501 Pin60 while inserting the CST ?

Does the “L” signal appear at IC501 Pin60 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 Pin97?

Is the height adjustment of

the CTL Head accurate?

Check Deck Motor.

Readjust the height of the CTL Head.

Replace IC501.

Refer to “When the Y signal doesn’t appear on the screen in PB Mode”.

Confirm the CFG waveform at IC501 Pin87?

On tracking, do the CTL pulses move?

Does the Video Envelope waveform appear at IC501 Pin9?

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.

Are the foil patterns and the Components between IC501 Pin 90 and PMC01 Pin11 shorted?

Replace IC501.

Refer to “(2) No 12VA of Power section”

Do the Drum PWM Pulses appear at IC501 Pin76?

Are the foil patterns and

the Components between IC501 Pin76 and PMC01 Pin12 shorted?

Do the DFG Pulses appear

at IC501 Pin90?

Do the Drum PWM Pulses appear at IC501 Pin76?

Are the connecting patterns and the Components

between IC501 Pin76 and PMC01 Pin12 shorted?

When the Drum Motor doesn’t run,

Does 12V appear at PMC01 Pin8?

Does 2.8V appear at PMC01 Pin12?

Check the connector (PMC01) and the Drum Motor Ass’y.

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?

Check the PMC01 and the Capstan Motor Ass’y.

Does the Capstan PWM signal appear at IC501 Pin77?

Are the foil patterns and Components

between IC501 Pin77 and PMC01 Pin9 shorted?

Does the CFG signal come into IC501 Pin87?

Are the foil patterns and Components

between IC501 Pin77 and PMC01 Pin9 shorted?

2. SERVO CIRCUIT

(3) When the Capstan Motor doesn’t run,

YES

When the Capstan Motor doesn’t run,

Does 12VA appear at PMC01?

YES

Replace IC501.

YES

Refer to “SMPS(CAPSTAN/12Volt) Trouble Shooting”.

Are the foil patterns and component between IC501 Pin87 and PMC01 Pin1 shorted?

Check the Capstan Motor Ass’y.

VCR ELECTRICAL TROUBLESHOOTING GUIDE

3-10

4. OSD CIRCUIT

(1) I2C BUS CHECK

Keys do not work

Is 5V applied to IC501 Pin78?

Does FLD change when a function button is pressed?

No I2C bus communication

Does Power appear at the Pull up impedence (R569, R507)?

Replace IC501.

Refer to “SMPS 5.3VA Trouble Shooting”.

Replace the defective switches.

Refer to “SMPS 5.3VA Trouble Shooting”.

YES

2. SERVO CIRCUIT

(4) Keys do not work

VCR ELECTRICAL TROUBLESHOOTING GUIDE

3-11

5. Y/C CIRCUIT

(1) No Video in EE Mode,

No Video in EE Mode

Does the Video signal appear at IC301 Pins28, 30, 32?

Is REG 5.0V applied to IC301Pins23, 44, 45, 52, 68, 77?

Does the Video signal appear at IC301 Pin26?

Does the Video signal appear at PMD02 Pin7?

Does the Video signal appear at the PMD02 Pin5?

Does the Video signal appear at the JK602 Video Out Jack?

Check the REG 5V Line. (Power Circuit)

Is I2C BUS signal applied to IC301 Pins53, 54, 55?

Replace IC301.

Is there REG12 on the plus terminal of C653?

Check the REG 12V Line. (Power Circuit)

Check the Q605 (Video Buffer)

Check the DVR Module

Check the IC601 and Video Out Line

Check the System Circuit. (Refer to ‘SYSTEM I2C BUS CHECK Trouble Shooting’)

YES

Check the REG 5V Line. (Power Circuit)

Check DVR Video Input (PMD02 Pin 5), Tuner Video Input (TU701 Pin24), Line Video Input (IC602 Pins 1, 3, 5, 7), respectively.

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 5V applied to IC301 Pins23, 44, 45, 52, 68, 77?

Is the Y/C Bus siganl applied to IC301 Pins53, 54, 55?

Does the normal RF signal appear at IC301 Pin14?

Check the line of the REG 5V Line. (Power Circuit)

Check the System Circuit. (IC501 Pin18)

Check the V.H.S/W level.

Refer to ‘SYSTEM Y/C BUS CHECK Trouble Shooting’.

Is the V.H.S/W signal applied to IC301 Pin57?

Does the Rectangular waveform(5V) appear at IC301 Pin57(V.H.S/W)

Clean the Drum.

Check C324.

Check R328, C322, C323.

Does the Y(Luminance) signal appear at IC301 Pin20?

Is the Y(Luminance) Video waveform showed up at IC301 Pin22?

Replace IC301.

YES

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 5V applied to IC301 Pins23, 44, 45, 52, 68, 77?

Does the Color signal appear at IC301 Pins41, 50?

Check the line of the REG 5V Line. (Power Circuit)

Replace X301.

Check C342, C341, R333.

Is X301 (3.58MHz) normal?

Replace IC301.

Does the Color signal appear at IC301 Pin48?

Replace IC301.

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,

YES

Check system part (V.H/SW)

Replace the IC301.

Check the drum

*OPTION Pins72, 73, 74(SP) Pins65, 66, 67(EP)

REC mode

Check the EE mode

Is EE mode normal?

Is color

normal?

YES YES

Is brightness normal?

Does signal appear at IC301 Pins41, 50?

Check X301 oscillation frequency.

YES

Is the brightness signal supplied to IC301 Pins18?

Is 5V supplied to IC301 Pins23, 44, 45, 68, 77?

Check the power of Pins23, 44, 45, 52, 68, 77.

Check the 5V power

Is Y/C Bus applied to IC301 Pins53, 54, 55?

Check the REG 5V power

Check system part

Do X301 and X-TAL oscillate?

Check X301

Is V.H SW supplied to IC301 Pin57?

Does the FM signal appear at IC301*?

VCR ELECTRICAL TROUBLESHOOTING GUIDE

3-15

6. Tuner/IF CIRCUIT

(1) No Picture on the TV screen

No picture on the TV screen

Does the Video signal appear at TU701 Pin16.

YES YES

Is +33V applied to TU701 Pin14?

YES

Is +5V applied to TU701 Pin3?

Does the video signal appear at IC301 Pin32.

YES

Does the Video signal appear at IC601 Pin 4.

Check the signal flow from IC601 Pin23 to JK601 Pin Video out.

YES

Check 33V line.

Check 5V line.

YES

Does the Clock signal appear at TU701 Pin9?

Check the l2C Clock Signal of µ-COM Pin71.

YES

Does the data signal appear at TU701 Pin10?

Replace Tuner.

Check the signal flow from IC501 Pin26.

Check the signal from IC301 Pin26 to IC601 Pin4

Check the l2C Data Signal of µ-COM Pin72.

VCR ELECTRICAL TROUBLESHOOTING GUIDE

3-16

VCR ELECTRICAL TROUBLESHOOTING GUIDE

(B) No Sound

No Sound.

Check the Vcc of IC801 Pins15, 32, 36,

46.

YES

Check 5.2V Line.

Check the Tuner SiF signal at IC801 Pin57.

YES

Check the oscillator of IC801 Pin51.

YES

Check the Audio of IC801 Pins78, 80.

Check the Tuner SIF of TU701 Pin22.

Replace X301

Check the IIC Clock and Data at IC801 Pins37, 38.

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