LG LRY-517 Service manual

Download

Page 1

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

Page 2

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

Page 3

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.

Page 4

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.)

Page 5

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)

Page 6

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

Page 7

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]

Page 8

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

Outputs

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

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.

Page 9

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

Page 10

2-2

EXPLODED VIEWS

1. Cabinet and Main Frame Section

463

250

463

A00

265

A46

469

321

323

276

465

261

320

300

257

255

469

A47

A60

A26

A26A

290

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

452

A44

Page 11

2-3

2. 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

INSTRUCTION ASSEMBLY

801

803

804

ACKING

BAG

802

BOX CARTO

Page 12

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

Page 13

3-2

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

OVERALL WIRING DIAGRAMS

Page 14

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)

(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)

Page 15

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 (14V - 17V) supplied to IC101 Pin7?

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

Page 16

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

Page 17

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

Page 18

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

NO NO

YES

VCR ELECTRICAL TROUBLESHOOTING GUIDE

Page 19

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

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.

YES

VCR ELECTRICAL TROUBLESHOOTING GUIDE

Page 20

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,

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

Page 21

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

2. SERVO CIRCUIT

(4) Keys do not work

VCR ELECTRICAL TROUBLESHOOTING GUIDE

Page 22

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

Does the Video signal appear at the IC601 Pin4?

Check PMD02 Pin5 and IC601 Pin4

YES

Replace IC601?

VCR ELECTRICAL TROUBLESHOOTING GUIDE

Page 23

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.

YES

Replace the IC301.

VCR ELECTRICAL TROUBLESHOOTING GUIDE

Page 24

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.

YES

VCR ELECTRICAL TROUBLESHOOTING GUIDE

Page 25

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?

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)

YES

Does PB Mode operate nomally?

Check PB Mode.

YES

Check the Drum & Drum

Connector

YES

Page 26

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

Check the Audio of IC801 Pins53, 57.

Check the SC901, JK601.

Check the DVD Audio out.

Check the Tuner Part

Check the Power 5.0V, 12V.

YES

Check the IC501 Pins71, 72.

Replace IC801.

Check the Audio of PMD02 Pin19, 21.

Check the Pcb Pattern between IC801

Pin53, 57 with PMD02 Pin19, 21.

YES

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

Check the AV1 Audio of IC801 Pins9, 14.

Check the AV1 Jack.

Check the AV2 Audio of IC801 Pins10, 15

Check the AV2 Jack.

Page 27

3-16

VCR ELECTRICAL TROUBLESHOOTING GUIDE

3. Y/C CIRCUIT

(2) Hi-Fi Playback

YES

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.

Check IC501 Pin27 (A.H/SW)

Is Pin29 of IC801 over

3.5V

Check Rec ‘H’ signal of µ-com.

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)

Check the Connection at P3D01 Pins7, 9.

Replace IC801.

Check the PCB pattern between IC801 Pins3, 5, 7 with PMD02 Pins19, 21

Check the DVD Board Audio Part

Page 28

3-17

(3)

Hi-Fi REC.

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

Check Vcc of IC801. (Pins25, 40, 51, 58)

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.

Check ports of µ-COM. (IC501 pins 71, 72)

Check Audio input signal of IC801 Pins2, 4, 9, 10, 14, 15, 48.

Replace IC801.

VCR ELECTRICAL TROUBLESHOOTING GUIDE

Page 29

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.

Is “TV” displayed on FLD displayed

YES

Is +5V applied to TU701 Pin 3?

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.

Check the voltage at Pin26 of IC501. (“H” for tuner mode)

Check the path form Pin23 of IC601 to the Pin 5 of TU701.

Page 30

3-19

VCR ELECTRICAL TROUBLESHOOTING GUIDE

(B)

No TV sound.

Check the Vcc of IC801(Pin58).

YES

Check Power (Vcc 12V)

Check IC801 Pin 43(DATA), Pin 42(CLOCK) “HIGH”?

YES

Check IC801 Pin 48(TUNER SIF).

Replace IC801.

YES

Check IC501 Pin 71(CLOCK), Pin 72(DATA)

YES

Check TU701 Pin 13 (TUNER Audio Output)

Page 31

Page 32

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

TH0

C103

S/W Block

(Q111

)

Y-CAP C111

T101

SNUBBER

BLOCK (D101,C105 C106,R103)

DRIVE & S/W BLOCK

(IC101, D102, R105,

C108,C112,C120,

ZD101

)

PHOTO COUPLER

(IC107

)

SNUBBER

BLOCK

(D103,C115,C116

,R112,R115)

DRIVE & S/W BLOCK

(IC104, D104, R113,

C117,C114,C119,

ZD102)

(D126,C136,L122,C130

PHOTO COUPLER

(IC102

T10

PHOTO COUPLER

(IC105

RECTIFIER &

SMOOTING BLOCK

(D128,C133,R130)

RECTIFIER &

SMOOTING BLOCK

RECTIFIER &

SMOOTING BLOCK

(D129,C128,R147)

RECTIFIER &

SMOOTING BLOCK

(D130,C137,R146)

RECTIFIER &

SMOOTING BLOCK

(D121,C122,L121,C124)

FEED-BACK

)

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,C125

)

ERROR AMP

(IC106)

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 Block

(Q120,ZD153,C135,

R144,R145,D155,C157)

TO VCR

(P101)

5.3VA

5.0V

ap Vcc

REG 12V

33V

12V REG & S/W Block

(Q126,R150,ZD152,

C156,C153)

33V S/W Block

(Q123,R143,R134

)

12VA(DRUM)

PWR CTL 'H'

HSR 'H'

DVD PWR CTL

FD(-)

5.0V S/W Block

(Q124,R140,R135,R136

D134,C134

HSR CTL Block

(Q121,Q122,R141)

)

PWR CTL Block

(Q125,R137,R138

12V REG & S/W Block

(IC157,R156,C155)

)

FD(+)

-28VA

TO FAN

(P104)

8.7V

TO VDR

(P102)

-12V 12V

5.0V REG & S/W Block (IC151,R151,C151)

1.8

2.5V

3.3V

1.8V REG & S/W Block (IC160,R159,C152,

R167,R168)

)

3.3V REG & S/W Block (IC154,R154,C154)

5.0V

TO LOADER

(P103)

12V

5.0V

2.5V REG & S/W Block (IC152,R169,C150

)

Page 33

3-22 3-23

2. AVCP BLOCK DIAGRAM

1) PB Mode

2) REC Mode

System

(FROM u-COM)

CLOCK

(FROM u-COM)

DATA

VCO/OSC

interface

L-DET

VCD

(-4dB)

SP CH2

REC-AMP

APC/ACC

V. OUT

D-V SYNC

(FROM u-COM)

MIX

AMP

DET

APC/ACC

Main

Conv2

CCD LPF

VCA

SQUEL CH

C.K

BDBPF

L- DET

C LPF DEALY

fh Trap

HIFI Trap

CTL Trap

ACC

2M LPF

CLEAR

Main

SYNC

Conv1

CLAMP

De-eMPH

Main

De-Empf

S LPF

DEMO

FM AGC P.EQ G.EQ D LIM Y LPF

TRAP

SYNC SEP

FBC

Video ALC

Sharpness

CONTROL

YNR NC

CLAMP

LPF

3640383723 26

System

DATA

System

CLOCK

CLOCK Drive

interface

VCO/OSC

Y-CCD

C-CCD

57 45 46

73 6574

Serial Cont

X-tal

68 71

79 78

V.H/SW30

System

(FROM u-COM)

57 7365 74 6867

(FROM u-COM)

X-tal

Serial Cont

IC301

HA118725NF

IC301

SP CH1

SP CH2

REC-AMP

899190

EP CH2

EP CH1

REC-AMP

HA118725NF

C-CCD

CLOCK Drive

SP CH2

REC

f0=1.68M

MIX

B.E

LPF

CCD

C-LPF

Main

Conv2

DET

Y-CCD

LPF

SPFACC

Trap

ATT

C.K

SP CH1

REC-AMP

C-LPF

Main

Conv2

6dB

AMP

VCA

TRAP

HPF

LPF

MOD

Main

Emph

ALC

FBC

NL Emph

D.E.

CLEAR

SQUEL CH

SYNC

EP CH2

REC-AMP

Adjst

f/0DEV

FBC

Video ALC

Y-LPF

EP CH1

REC-AMP

YNR

AGC

VIDEO

SYNC

AGC DET

SEP

CLAMP

LPF

ATT

-10dB

2HD Model Only

4HD/4HD Hi-Fi Model Only

17 19 18 36 40 38 37 51 36 30 32 9 8 11

++++

VIDEO IN S/W

DVD

VIDEO IN TV

V.ENV

V.H/SW30

(FROM u-COM)

System

4HD/4HD Hi-Fi Model Only

2HD Model Only

(TO u-COM)

SP CH2

SP CH1

EP CH2

EP CH1

V. OUT

D-V SYNC

Page 34

3-24 3-25

3. SYSTEM BLOCK DIAGRAM

TO/FROM AVCP

TO/FROM DECK

TO/FROM AUDIO(Hi-Fi)

TO/ FROM TU/IF

TO/FROM DECK

MODE S/W

T-UP END

ES501

R550

LD501 DECK IR LED

R553

R555

R557

RS501

T-UP REEL

5.3VA

MS501

To/FROM DVD

SUP END

R556

RS502

SUP REEL

CST.SW/REC TAP

R531

CS501

5.3VA

GND

MODE S1 MODE S2 MODE S3 MODE S4

ES502

R564

R538

R558 C582

R544

X501

32.768KHz

R535

R537

X502

14MHz

OSC

R536

R5C6

C534

C552

C535

I-Limit

MODE S1

MODE S2

MODE S3

MODE S4

VDR ENA

VDR DATA

VCR DATA

VCR ENA

X in

X out

Xc in

Xc out

36 21

T-UP Sensor

SUP Sensor

T-UP Reel

SUP Reel

CST IN

R/C

RC601

CAP. PWM

CTL -

CTL +

DRUM PWM

12 59

CFG

DPG

IC501

M37760

LD CTL

CAP. REV 'H'

Vss (OSD)

Vss (AMP)

V. ENV

V.H.SW30

Vss (SYSCON)

Vcc (A/D)

H.A.SW

REC 'H'

D.V.Sync

A.MUTE'H'

FLD DATA

FLD ENA

FLD CLK

A. H.SW

A. MUTE 'H'

REC 'H'

IIC CLK

IIC DATA

CV OUT

IIC CLK

IIC DATA

POWER FAIL

Vcc (OSD)

Vcc

50 17

74 15

C.ROT

68 69 70

A. ENV

19 68

71 72 52

100

AFT

VCR 'H'

Vcc

(SYSCON)

(SERVO)

RESET

+ +

C500 C517

CV IN COMP IN

C592

TO/FROM AVCP

DISPLAY

IC5F1

TO/FROM AUDIO(Hi-Fi)

TO/ FROM TU/IF

R541

R529

C503

Q503

Q501

R583

L512

5.3VA

IC504

Vcc

IC505

Vcc

GND

C561

L501

LGXBR446 (LGEUS)

Page 35

3-26 3-27

4. JACK BLOCK DIAGRAM

To.AVCP To.AVCP

From

AVCP

PMD02

1) Front Video

3) Mixed Video

5) VDR CVBS

7) VCR Video

9) Y (Super)

11) C (Super)

19) VCR A-L

21) VCR A-R

23) VDR A-L

25) VDR A-R

27) Front A-L

29) Front A-R

13) Y

15) Pb

17) Pr

VIDEO SW IC

3 5 1

IC601

VIDEO AMP IC

6 21

2 26 10 20 12 18 14

From PMD01 Pin

IEC-958

To Hi-Fi

To TUNER

MOD VIDEO

JK601

A/V JACK

AV1 Video in AV1 Audio in (L/R)

Video Out

Y Out (Super) C Out (Super) Y Out (Comp) Pb Out (Comp) Pr Out (Comp)

Audio Out L Audio Out R

Coaxial Out

From/To Hi-Fi IC801

JK603

Optical Jack

LGXBR446 (LGEUS)

Page 36

3-28 3-29

5. STUNER/MTZ BLOCK DIAGRAM

A.IN

CH S/W

REG 5V

CONTROL

V.IN

RF AGC

ENABLE

CLOCK

DATA

AFT

A.OUT

SIF

TU 30V

V.OUT

716 MOD A.IN

61 MOD CTL

106 5V

26 VCR 'H'

671 MOD VEDIO

71 IIC CLK

72 IIC DATA

781 SIF OUT

999 GND

731TU.V.OUT 45833V 100AFT

LGXBR446 (LGEUS)

Page 37

3-30 3-31

6. AVCP BLOCK DIAGRAM

1) EE Mode

2) PB Mode

3) REC Mode

A. OUT (L)

IC801

AN3662(AN3663)

A. OUT (R)

OUTPUT

SELECTOR

626

VCA

73 74

(System)

From u-COM

DATA

CLOCK

A. OUT (L)

IC801

AN3662(AN3663)

A. OUT (R)

OUTPUT

SELECTOR

626

VCA

73 74

(System)

From u-COM

DATA

CLOCK

DET

IC301

HA118725NF

IC801

AN3662(AN3663)

VCA

NORMAL

AUDIO

OUT

REC

AMP

DVD

A.OUT'L'

A.OUT'R'

15 10 14

IC301

HA118725NF

AMP

N.A.IN

/P HEAD

IC301

HA118725NF

AMP

N.A.IN

/P HEAD

TU701

TUNER

18 48

OUT

AUDIO

DVD'L'

DVD'R'

LINE 1 'L'

LINE 2 'L'

LINE 1 'R'

LINE 2 'R'

Page 38

3-32 3-33

A B C D E F G H I J K L M N O P Q R ST

30VA No Power D130 is Defective

No Power BD101,TH01 is Defective

-28VA No Power D127 is Defective

No Power D102 is Defective

5.3VA No Power D121 is Defective

Switching Error IC102,IC103 are Defective

No Power F101 is Defective

3.3V No Power D122 is Defective

Switching Error IC105,IC106 are Defective

S/W Error IC107,Q111 is Defective

12V No Power D125 is Defective

28V No Power D129 is Defective

12V No Power D126 is Defective

12V No Power Q125 or ZD152 are Defective

12V No Power IC157 is Defective

2.5V No Power IC152 is Defective

5V No Power IC151 is Defective

1.8V No Power IC160 is Defective

3.3V No Power IC154 is Defective

5V No Power D124 is Defective

1.8V No Power D123 is Defective

No Digitron Displayed D128,R107,ZD151 are Defective

S/W Error IC101,IC104 is Defective

28V No Power Q120 or ZD153 are Defective

NOTES) Symbol denotes AC ground.

NOTES) Symbol denotes DC chassis ground.

NOTE) Warning

NOTE) Parts that are shaded are critical NOTE) With respect to risk of fire or NOTE) electricial shock.

CIRCUIT DIAGRAMS

1. POWER(SMPS) CIRCUIT DIAGRAM

IMPORTANT SAFETY NOTICE

WHEN SERVICING THIS CHASSIS, UNDER NO CIRCUMSTANCES SHOULD THE ORIGINAL DESIGN BE MODIFIED OR ALTERED WITHOUT PERMISSION FROM THE LG ELECTRONICS CORPORATION. ALL COMPONENTS SHOULD BE REPLACED ONLY WITH TYPES IDENTICAL TO THOSE IN THE ORIGI-

NAL CIRCUIT. SPECIAL COMPONENTS ARE SHADED ON THE SCHEMATIC FOR EASY IDENTIFICATION.

THIS CIRCUIT DIAGRAM MAY OCCASIONALLY DIFFER FROM THE ACTUAL CIRCUIT USED. THIS WAY, IMPLEMENTATION OF THE LATEST SAFETY AND PERFORMANCE IMPROVEMENT CHANGES INTO THE SET IS NOT DELAYED UNTIL THE NEW SERVICE LITERATURE IS PRINTED.

NOTE :

1. Shaded( ) parts are critical for safety. Replace only with specified part number.

2. Voltages are DC-measured with a digital voltmeter during Play mode.

Page 39

3-34 3-35

A B C D E F G H I J K L M N O P Q R ST

2. TUNER CIRCUIT DIAGRAM

Page 40

3-36 3-37

A B C D E F G H I J K L M N O P Q R ST

WAVEFORM

8 1312

3. A/V CIRCUIT DIAGRAM

Page 41

3-38 3-39

A B C D E F G H I J K L M N O P Q R ST

4. Hi-Fi CIRCUIT DIAGRAM

Page 42

3-40 3-41

WAVEFORM

A B C D E F G H I J K L M N O P Q R ST

5. SYSTEM CIRCUIT DIAGRAM

Page 43

3-42 3-43

A B C D E F G H I J K L M N O P Q R ST

6. JACK CIRCUIT DIAGRAM

Page 44

A B C D E F G H I J K L M N O P Q RST

3-44 3-45

7. TIMER CIRCUIT DIAGRAM

Page 45

3-46 3-47

WAVEFORMS

IC301 Pins 8, 9 PB mode 500mvp-p

IC301 Pins 15, 17, 19, 21 Video in 1Vp-p

IC301 Pin 31 PB/REC mode

4.0Vp-p

IC301 Pin 98 REC mode

1.1Vp-p

IC301 Pin 94 REC mode

2.0Vp-p

IC301 Pin 29 PB mode

2.02Vp-p

IC301 Pin 57 PB mode 400mVp-p

IC301 Pin 63 PB mode 400mVp-p

IC301 Pin 73 PB/REC mode 5Vp-p

IC301 Pin 74 PB/REC mode 5Vp-p

IC301 Pin 77 REC mode 340mVp-p

IC301 Pin 42 PB mode 300mVp-p

IC301 Pin 53 PB mode 400mVp-p

IC301 Pin 80 PB mode

3.6Vp-p

✦ IC301 Oscilloscope Waveform

✦ IC501 Waveform Photographs

V.HSW (IC501 Pin 18) 1V/10mS REC/PB MODE

DV.SYNC (IC501 PIN 13) 1V/100uS QUE/REV MODE

CTL(+) (IC501 Pin 95) 1V/10mS

CTL(-) (IC501 Pin 94) 1V/10mS

DFG/DFG (IC501 PIN 90) 1V/10mS REC/PB MODE

CFG (IC501 Pin 87) 1V/10mS

V.IN (IC501 Pin 49) 500mV/20uS

Page 46

3-48 3-49

1 0.06 0.06

2 0.06 0.06

3 0.06 0.06

4 0.35 0.37

5 2.35 2.09

6 2.58 2.55

7 2.83 2.83

8 1.84 1.24

9 1.84 1.23

10 2.41 1.89

11 2.61 3.00

12 1.60 0.56

13 0.00 0.00

14 2.80 2.26

15 2.80 2.38

16 0.18 1.91

17 2.79 2.80

18 1.76 1.91

19 2.80 2.80

20 0.02 0.00

21 2.80 2.80

22 5.08 5.12

23 2.32 2.34

24 0.18 0.57

25 2.12 2.12

26 3.00 2.80

27 0.18 0.45

28 0.15 0.15

29 2.48 2.46

30 2.80 2.91

31 0.37 0.37

32 2.31 2.79

33 2.09 2.13

34 1.76 1.85

35 3.03 3.07

36 2.32 2.35

37 3.03 3.06

38 2.15 2.20

39 1.42 1.45

40 2.08 2.12

41 3.01 2.55

42 1.98 1.97

43 2.05 2.05

44 0.00 0.00

45 3.13 3.15

46 3.13 3.15

47 5.03 5.07

48 0.14 0.14

49 3.17 3.19

50 5.03 5.07

51 2.05 2.07

52 5.03 5.07

53 2.62 2.64

54 0.00 0.00

EE PLAY

MODE

PIN NO.

IC301

55 2.07 2.09

56 0.00 0.00

57 2.18 2.18

58 2.34 2.34

59 4.94 4.97

60 4.94 4.97

61 0.02 0.02

62 2.28 2.21

63 2.23 2.23

64 2.94 2.95

65 2.26 2.26

66 2.95 2.96

67 2.19 2.18

68 1.28 1.24

69 1.96 1.96

70 2.71 1.42

71 2.19 2.19

72 0.14 0.14

73 5.20 5.21

74 5.20 5.21

75 2.76 2.79

76 2.25 2.17

77 2.84 2.84

78 0.02 0.03

79 0.00 0.00

80 2.54 2.53

81 4.85 4.84

82 4.15 4.15

83 0.00 2.53

84 5.07 5.10

85 2.46 2.30

86 2.54 2.30

87 2.45 2.30

88 0.00 0.00

89 2.48 2.30

90 2.52 2.30

91 2.48 2.30

92 5.08 5.11

93 0.52 0.51

94 2.53 2.54

95 2.53 2.52

96 2.53 2.50

97 0.01 0.01

98 2.27 2.55

99 0.00 0.00

100 2.58 2.55

10 0

2 4.52 4.82

3 4.84 4.84v

4 4.64 4.58v

5 4.56 4.56v

6 80m 60m

70 0

8 4.98 4.98

EE PLAY

MODE

PIN NO.

• CIRCUIT VOLTAGE CHART

9 4.98 5.30

10 4.8 4.80v

11 4.82 4.82

12 4.72v 4.82

13 4.92 4.92

14 5.02 5.02

15 0 0

16 4.98v 4.98

17 5.04 5.04

18 4.98v 9.98

19 2.46v 2.46

20 3.36V 3.36

21 0 0

22 0 0

23 4.96v 4.96v

24 120mv 140m

25 4.94 4.94

26 4.92v 4.92v

27 20m 20mv

28 5.02 5.02v

29 4.98v 4.98

30 4.84v 4.84

31 5.00v 5.00v

32 0 0

33 4.98 4.94

34 0 5.00v

35 5.02 100m

36 3.16 3.12v

37 5.7v Da/Clk(5.5)

38 0 5.7v

39 520m 0

40 4.84 520m

41 4.83 Da/Clk(5.62)

42 4.86v 4.86v

43 0 0

44 5.02 5.0v

45 0 0

46 3.94 3.94v

47 2.88 2.88v

48 0 0

49 0.98 2.94

50 1.84 1.94v

51 0.98 4.78

52 3.28 3.28v

53 2.38 2.38v

54 2.52 2.54v

55 1.88 1.88

56 0 0

57 0 0

58 120m 120m

59 4.92v 4.92v

60 4.92v 4.92v

61 0 0

62 4.82 4.82v

63 3.98 3.98v

EE PLAY

MODE

PIN NO.

64 0 0

65 2.36 2.36v

66 0 0

67 4.68 9.68v

68 0 0

69 2.48 2.48v

70 2.48 2.48

71 0 0

72 2.48 4.98

73 4.92 4.92v

74 0 0

75 2.52 2.42

76 2.42 2.48

77 80m 80m

78 0 0

79 4.02v 4.96v

80 4.96v 4.96

81 2.8 280m

82 1v 2.62v

83 120m 3.24v

84 0 1.96

85 0 0

86 4.98 4.9v

87 4.98 4.98

88 5.0v 5.0v

89 0 0

90 4.88 4.88v

91 0 0

92 0 0

93 5.04v 5.04v

94 4.88 0

95 4.98 4.98

96 0 0

97 0 0

98 4.98 4.98

99 20m 4.98v

100 0 0

1 4.88 4.88v

2 1.46 1.48

3 1.38 1.38

40 0

5 2.26v 2.24

6 2.38 0

70 0

80 0

90 0

10 0 0

11 0 5.0v

12 5.0v 5.0

13 5.0v 0

14 0 0

15 0 0

16 0 0

17 0 0

EE PLAY

MODE

PIN NO.

IC751

IC501

18 0 0

19 4.88 4.88

20 0 0

21 0 0

22 0 0

23 0 0

24 0 0

25 0 0

26 0 0

27 0 0

28 0 0

29 0 0

30 2.96v 3.98

31 2.96 3.98

32 0 0

33 4.88v 4.88

34 3.64v 3.58v

35 0 0

36 2.62v 2.58

37 0 0

38 0 0

39 0 0

40 2.54v 2.54

41 2.54 2.56

42 2.48 2.48

43 2.3v 2.34

44 0 0

10 0

20 0

3 0 142M

4 DA/CL(5.34) DA/CL(5.34)

5 DA/CL(5.34) DA/CL(5.34)

60 0

7 DA/CL(5.34) DA/CL(5.34)

80 0

9 DA/CL(5.34) DA/CL(5.34)

10 DA/CL(5.34) DA/CL(5.34)

11 0 41M

12 DA/CL(2.82) DA/CL(2.82)

13 0 0

14 DA/CL(2.82) DA/CL(62M)

15 2.89 1.41

16 1.53 950M

17 DA/CL(1.14) DA/CL(810M)

18 0 0

19 5.26 5.24

20 5.26 5.24

1 3.28 3.24

2 3.28v 3.28

3 3.32 3.26

4 3.28 3.92

5 3.28 3.92

6 3.28 3.26

EE PLAY

MODE

PIN NO.

IC7V1

IC801

7 3.28v 3.74

8 3.28 3.24

9 3.28v 3.24

10 3.28 3.24

11 3.28v 3.26

12 0 0

13 3.78 4.52

14 0 0

15 0 640m

16 5.82 6.64

17 5.28v 6.68

18 0 620m

19 6.28 6.66

20 6.28 6.72

21 4.46v 4.42

22 3.28 4.02

23 3.62 3.68

24 3.74 4.12

25 3.74 3.76

26 0.1 640m

27 0 0

28 3.7v 3.68

29 3.66 3.64

30 0.7 680m

31 3.72 3.72v

32 3.74v 4.08

33 3.62 3.68

34 13.4v 13.32

35 580m 520m

36 0 520m

37 580m 520m

38 0 0

39 0 20m

40 4.7 4.76

41 0v 1.68

42 5.0v 5.04m

43 50.v 4.96

44 20m 3.38

1 4.76 4.68

2 2.02v 2.24

3 4.88 4.88

4 1.64 1.78

5 4.72 4.78

6 1.88 1.88

70 0

8 2.26 2.18

90 0

10 1.64v 1.72

11 0 0

12 1.92v 2.08

13 4.86 4.82

14 1.92v 2.08

15 0 2.31

16 2.26v 2.64

EE PLAY

MODE

PIN NO.

IC901

17 0 0

18 2.28 2.74

19 0 0

20 2.56v 2.58

21 2.64v 2.68

22 0 0

23 2.56v 2.92

24 0 0

25 0 0

26 2.52v 2.98

27 20m 0

28 4.72 4.68

1 2.51 2.51

2 2.39 2.39

3 3.54 3.53

4 2.57 2.56

5 1.52 1.34

6 0.43 3.68

7 1.3m 0

8 1.2m 0

9 3.04 3.03

10 2.52 2.52

11 2 2.05

12 3.22 1.97

13 3.99 3.99

14 2.5 2.495

15 3.11 1.93

16 3.2 3.18

17 27.4m 4.11

18 112.1m 3.35

19 2.27 2.26

20 1.99 2.12

21 2.31 2.37

22 0.78 0.81

23 5.02 5.01

24 5.02 5

25 2.44 2.27

26 2.44 2.26

27 2.82 2.85

28 181.5m 187.4m

29 371.6m 212.2m

30 2.08 2.08

1 3 2.99

2 36.3m 38.1m

3 3.04 3.04

4 6.4m 39.1m

5 3.04 3.04

6 5.02 5.03

7 2.24 2.23

80 0

1 6.71 6.66

2 5.05 5.05

EE PLAY

MODE

PIN NO.

IC901

IC302

IC804

3 6.02 5.96

40 0

5 6 5.96

6 5.99 5.94

7 22.3m 21.3m

8 6.68 6.65

9 6.7 6.67

10 1.1m 0

11 6.71 6.68

12 5.04 5.05

13 12.03 11.99

14 6.7 6.7

15 0 0

16 6.73 6.69

1 1.3 1.3

2 4.9 4.9

3 1.66 1.56

40 0

50 0

6 4.9 4.9

7 1.7 1.6

80 0

1 1.37 1.37

25 5

3 2.18 2.17

40 0

50 0

6 5.21 5.21

7 2 2.17

80 0

EE PLAY

MODE

PIN NO.

IC902

IC903

Page 47

3-50 3-51

PRINTED CIRCUIT DIAGRAMS

1. VCR P.C.BOARD

Page 48

3-52 3-53

2. SMPS P.C.BOARD

LOCATION GUIDE

Page 49

3-54 3-55

3. JACK P.C.BOARD

LOCATION GUIDE

( BOTTOM VIEW )

4. HDD P.C.BOARD

( TOP VIEW )

Page 50

3-56 3-57

5. KEY P.C.BOARD

6. Timer P.C.BOARD

( TOP VIEW ) ( BOTTOM VIEW )

( TOP VIEW )

( BOTTOM VIEW )

Page 51

Page 52

3-58

VDR ELECTRICAL TROUBLESHOOTING GUIDE

1. Power(SMPS) CIRCUIT

No 3.8VA

Replace the F101 (Use the same Fuse)

Is the F101 Normal?

Is the TH01

Normal?

Is the BD101 Normal?

Replace the BD101

Replace the TH01

Is the IC107,Q111 Normal?

Check or Replace the IC107,Q111

Replace the D122

Replace the IC106

Replace the D123

Replace the D124

Replace the D125

YES

Is Vcc (14V-17V) supplied to IC101 Pin7?

Are the D122 normal?

Is there about 2.5V at the IC106 Pin1?

Is the D123 normal?

Is the D124 Normal?

Is the D125 Normal?

Power Line of Main PCB(VDR) is short

VDR PART

No 3.3V

Check or Replace the D122

Is there about 3.8V at the IC154 pin1?

Check the IC154 and Replace

Is there about 3.3V~ 5V at the IC154 pin4?

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

YES

Page 53

3-59

VDR ELECTRICAL TROUBLESHOOTING GUIDE

No 2.5V

Check or Replace the D122

Check the ‘DVD PWR CTL

“H”’ signal from µ-com

Is there about 3.8V

at the IC152 pin1?

Is there about 3.3V~

5V at the IC152 pin4?

Check the IC152

and Replace

YES

No 5.0V

Check or Replace the D124

Is there about 5.5V

at the IC151 pin1?

Is there about 3.3V~ 5V

at the IC151 pin4?

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

YES

Check the IC151

and Replace

YES

No 1.8V

Check or Replace the D123

Is there about 2.3V

at the IC160 pin1?

Is there about 3.3V ~ 5V at the IC60 pin4?

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

Check or Replace the R167,R168

YES

Are the R167,R168

normal?

YES

Check the IC160

and Replace

YES

No 12V

Check or Replace the D125

Is there about 13.5V

at the IC157 pin1?

Check the IC157 and Replace

Is there about 3.3V~

5V at the IC157 pin2?

Check the ‘DVD PWR CTL

“H”’ signal from µ-com

YES

Page 54

3-60

2. No Component video signal when playing DISC

Component : No Y Signal Component : No Pb Signal Component : No Pr Signal

R905, C923 R904, C922 R903, C921

IC601 – 12 Check input

IC601 – 14 Check input

C907 C908

IC601 – 10 Check input

C906

FL505, FL506, FL507 Check Signal in DVD Board

Check CLK X101

Check IC101 Power and Other Circuits

YES

NO NO

VDR ELECTRICAL TROUBLESHOOTING GUIDE

Page 55

3-61

VDR ELECTRICAL TROUBLESHOOTING GUIDE

3-61

3. No COMPOSITE / S-VIDEO signal when playing DISC

COMPOSIT : No Signal S-VIDEO : No Y Signal S-VIDEO : No C Signal

R911, C927 R902, C920 R901, C919

IC601 – 6 Check input

IC601 – 2 Check input

C904 C902

R4103, R4107 Check Signal

IC601 – 4 Check input

C903

IC5101-40 : HIGH /RST_VENC

R154, R155 Signal and 3.3V level

IC5101 41,42 Check I2C Clk, Data

Check R5101 CLOCK

R5124~R5131 Check VO_D0 ~VO_D15

Check IC101 power And Other circuits

IC5101 9~16 Check MP7~MP0 signal

YES

YES YES

YES

NO NO

Page 56

3-62

VDR ELECTRICAL TROUBLESHOOTING GUIDE

4. No TV, External Input video signal

No : TV signal AV3No : AV1 signal No : AV2 signal

No : S-JACK

signal

TU701 1-19 Check signal And circuit

IC802 - 1 IC802 - 3

IC501 – 1, 3, 8 check in the DVD Board

Replace X501 XTAL

IC301 – 21

check

IC802 - 28

IC802 – 31 Check output

IC301 - 15

IC301 – 29 check

Q310 collector Signal, power 12 V

C909, Q905 Check circuit

FL501 Check signal

YESYES YESYES

YES

YES YES

YES

IC502-34 : HIGH

/RST_VDEC

R4103, R4106 signal

YES

when reset IC502 – 28, 29 Check I

Clk, Data

Check R533, R526 Signal and

3.3V level

YES

check IC502 - 40 (VI_CLK)

Check X501 clock oscillated

YES

NO NO

<When playing DISC, no COMPONENT, COMPOSIT/S-VIDEO signal> Check

IC502 -> IC101 Check VI_D0~VO_D9 signal

Check IC502 power and other circuits

YES

IC301 - 17

NO NO

Page 57

3-63

VDR ELECTRICAL TROUBLESHOOTING GUIDE

Check VCR PART

PN303-1 signal

normal

Check FFC Cable

Signal flow

YES

Audio output even

When playing DISC

PN304-19~22 Check

audio signals

Check FFC Cable

and VCR part

Check FFC Cable

and VCR part

Check IC801 power and other circuits

Check AV_RST1 and power, other circuits

YES

IC803 – 1, 7 Check

audio signals

YES

IC802-9 Check

High?

YES

Check IC802 power

And Other circuits

YES

5. When playing DISC, no audio output

6. No TUNER audio output

7. No OPTICAL / DIGITAL output

IC802 – 15, 18 Check audio signals

Check IC802 power

and other circuits

Check AV_RST1 and

power, other circuits

IC802-10 Check

High?

YES

Check IC802 power

And Other circuits

YES

Page 58

3-64

VDR ELECTRICAL TROUBLESHOOTING GUIDE

3-64

<when playing DISC, no audio output> check

Check FFC Cable

and VCR part

Audio output even

When playing DISC

PN304-19~22 Check

audio signals

IC802 – 15, 18

Check audio signals

Check IC802 power

and other circuits

Check AV_RST1 and

power, other circuits

YES

IC802-10 Check

High?

YES

Check IC802 power

And Other circuits

YES

<when playing DISC, no audio output> check

Check Audio Cable

Audio output even

When playing DISC

PN5401 – 4~6 Check

audio signals

PN304-27~30 :

Check audio signals

Check PN302-5,6 and Front Jack Cable

Check FFC Cable

and VCR part

Check IC804 power

and other circuits

YES

PN304-19~22

Check audio signals

YES

IC804 – 10, 12 Check audio signals

YES

Check /RST-Audio and power, other circuits

IC804-9 Check

High?

Check IC804 power

And Other circuits

YESYES

YES

IC802 – 15, 18

Check audio signals

Check IC802 power

and other circuits

Check AV_RST1 and

power, other circuits

YES

IC802-10 Check

High?

YES

Check IC802 power

And Other circuits

YES

Check IC804 power

and other circuits

IC804 – 10, 12 Check audio signals

YES

Check /RST-Audio and power, other circuits

IC804-9 Check

High?

Check IC804 power

And Other circuits

YESYES

YES

8. No External Input 1, 2 audio 9. No External Input 3 audio

Page 59

BLOCK DIAGRAMS

1. VDR SET TOTAL BLOCK DIAGRAM

3-65

REAR JACK

AV1_IN

AV1

Y/C

A_R/L

Stereo

V_cvbs

CVBS

YPbPr

COAXIAL

OPTICAL

D_out

TU_AV_out

TUNER

TU_AV_in

D_control

VCR_A_R/L

Coaxial

Optical

S_Jack

R_Pr_OUT

B_Pb_OUT

G_Y_OUT C_OUT

Y_OUT

CVBS_OUT

YC_MIXER

V2_IN

V_VCR_IN

IEC958

VDR BOARD

VCR BOARD

A_OUT A2_IN

A_IN

Serial Comm.

Int_Prog

VDR_reset_L

V2A2Y/C

FRONT JACK BOARD

AV2_IN

BD[15:0]

BA[12:1]

CON[8:0]

9_IN_2

ATA_address[4:0]

ATA_data[15:0]

ATA_RESET

ATA_INT / IORDY / DIOR / DIOW / DMAACK

DVD RW DRIVE

Page 60

3-663-66

2. VDR MAIN H/ W BLOCK DIAGRAM

DDR

Memory

VCR Board

VDR_A

A_OUT

IEC958

UNIT

AUDIO_OUT

AO_D[3:0]

AO_IEC958

COX/OPT

VO_D[15:8]

Y/Pb/Pr

Y/C/CVBS

G_Y/B_Pb/R_Pr

Y/C/CVBS_OUT

UNIT

VIDEO_OUT

CVBS

Y/C

VO_D[7:0]

U-COM

I/P

SDA

SCL

CPRM_crl

BA[1:22]

Serial Comm.

VDR_RESET_L

UNIT

UCOM_IF

R/G/B

SIO_SPI_...

D_Control

Int_Prog

EEPROM

SCL

SDA

CS0

FLASH

Memory

HD[0:15]

BA[6:21]

Latch

74LVT16373

BA[1:5,22]

DMN Board

AI_D0

UNIT

AUDIO_IN

A_IN

VCR Board

V_VCR_IN

VI_D[2:9]

UNIT

VIDEO_IN

Y/C

V_VCR_IN

YC_MIXER

A2_IN

V2_IN

AV2_IN

Front Jack

DV 1394

BIO_PHY_DATA[0:7]

UNIT

HD[15:0]

UNIT

HOST_IF

BD[15:0]

S_JACK_DET

UNIT

CARD

MEMORY

BA[12:1]

CON[8:0]

9_IN_2

DATA[15:0]

ADD[4:0]....

DVD-RW DRIVE

Page 61

3-67

3. POWER BLOCK DIAGRAM

3.3VA

5VD

3.3VA

3V3

3.3V

VDDD

2.5V

VDDA

SAA7120

1.8V

+12V

MC33202

5VD

+12V

L2146

IOVDD

A33VDD

DVDD

A18VDD

V33PHY

TSB41AB1

VA_H

NJM2274

CS4351

CS5340

24LC168

74HCT125

3V3D

1.8V 3V3

FLASH

74LVT273

74ALVT16373

74LVT16245

74LVC245

74LVC32

74LVC04

74LVC541

74LVC08

2.5V

E5_1V81.8V

E5_3V3

E5_5VD5VD

G2995

1.25V

E5_2V52.5V

1.25V

DDR

SDRAM

VREF

E5_2V52.5V

SSTL2_VDD2.5V

DMN8602

3.3V

Page 62

3-68

4. AUDIO IN/ OUT BLOCK DIAGRAM

DMN8602

AI_MCLK0

AI_SCLK

MCLK

SCLK

ADC_L

AI_FSYNC

AI_D0

LRCK

SDOUT

ADC

(CS5340)

ADC_R

AV_RST1

/RST_AUDIO

AO_MCLK0

AO_SCLK

AO_FSYNC

AO_D0

LRCK

SCLK

DAC_L

SDIN

DAC

(CS4351)

DAC_R

MCLK

SCL

SDA

VCR Board

OP AMP

(MC33202)

A_L_IN

A_R_IN

A2_L_IN

A2_R_IN

Front Jack

A2_L_IN

A2_R_IN

OP AMP

(MC33202)

A_L_OUT

VCR Board

A_R_OUT

Page 63

3-693-69

5. CPU & CONTROL REGISTER BLOCK DIAGRAM

/SMSC_CS

Ethernet

LAN91C111

BA[1:17]

BD[0:15]

/RST_SMS

SMSC_IRQ

CS0

BA[1:22]

Flash

E5_WEL

E5_OE

4(8)MByte

HD[0:15]

74LVT16373

GND

BA[6:21]

E5_ALE

BD[0:15]

HD[0:15]

[1:5,22] BA[1:5,22]

BD[0:15]

74LVT16245

HD[0:15]

LAN_CS

/E5_OEL

Card

Memory

HD[0:15]

BA21

MEM_CON_SIG

74LVC32

/CS2

/BA[20:21]

/RST_VDEC

GPIO2

BA[20:21]

74LVC04

/RST_VENC

/RST_ PHY

/RST_AUDIO

GPIO1

E5_RST

MEMC_RST

GPIO4

DMN8602

E5_MA[1:5,22:26]

Page 64

3-703-70

6. VIDEO IN/ OUT BLOCK DIAGRAM

DMN 8602

VI_CLK0

VI_VSYNC0

VI_D[9:0]

VI_CLK0

VI_D[9:0]

VI_VSYNC0

VDEC

SCL

SDA

(L21146)

GPIO

/RST_VDEC

VO_D[7:0]

/RST_VENC

VO_D[7:0]

VENC

VO_CLK

(SAA7120)

YCCVBS

G/Y

R/Pr

B/Pb

YC MIX

(NJM2274)

14.3MHz

MIX_OUT

V_VCR_IN

VCR Board

Y_OUT

C_OUT

CVBS_OUT

G_Y_OUT

R_Pr_OUT

B_Pb_OUT

V2_IN

V2_MIX_OUT

Front Jack

V2_IN

Y_IN

C_IN

Page 65

3-71

7. DV 1394 IN/OUT BLOCK DIAGRAM

DMN 8602

PHY_DATA[7:0]

PHY_CTL[1:0]

PHY_LREQ

PHY_LPS

PHY_LINK_ON

PHY_CLK

GPIO

DV 1394

(TSB41AB1 )

TPA1+-/TPB1+1

/RST_PHY

Front Jack

Page 66

3-72

8. MEMORY CARD IN/ OUT BLOCK DIAGRAM

DMN8602

HD[15:0]

E5_ALE

HD[15:0]

GPIOExt

/WAIT

WAIT

OE/WE/RST

Host IF

Block

IO_READY

MEMC_OE/WE/RST

/CS2

BA[21:20]

CS2

/BA[21:20]

Header H601

BUS

BUFFER

PD[15:0]

PA[2:0] BA[18:16]

IC6901~

IC6903

READY

DR/DW/RST

9_IN_2

74LVC32

IC6904

ATA_CON_SIG

Page 67

Page 68

3-73 3-74

CIRCUIT DIAGRAMS

1. BGA 308P CIRCUIT DIAGRAM

A B C D E F G H I J K L M N O P Q R ST

Page 69

3-75 3-76

A B C D E F G H I J K L M N O P Q R ST

2. DDR & B TO B CONNECTOR CIRCUIT DIAGRAM

Page 70

3-77 3-78

A B C D E F G H I J K L M N O P Q R ST

3. POWER, FLASH, CONNECTOR CIRCUIT DIAGRAM

Page 71

A B C D E F G H I J K L M N O P Q R ST

3-79 3-80

4. RST, CONTROL/STATUS_REG., ATAPI, HOST_CPLD, LATCH CIRCUIT DIAGRAM

Page 72

3-81 3-82

A B C D E F G H I J K L M N O P Q R ST

5. VIDEO_IN, VIDEO_OUT CIRCUIT DIAGRAM

Page 73

A B C D E F G H I J K L M N O P Q R ST

3-83 3-84

6. DV1394, HDMI CIRCUIT DIAGRAM

Page 74

3-85 3-86

A B C D E F G H I J K L M N O P Q R ST

7. AUDIO IN/OUT CIRCUIT DIAGRAM

Page 75

3-87 3-88

• WAVEFORMS

X101

13.5MHz

IC5101 PIN42 SDA

IC502 PIN29 SDA

IC502 PIN40 VI_CLK

IC502 PIN74

14.318MHz

PN304 PIN5 CVBS_OUT

PN304 PIN9 Y_OUT

PN304 PIN11 C_OUT

PN304 PIN17 R_Pr_OUT

PN304 PIN13 G_Y_OUT

PN304 PIN15 B_Pb_OUT

IC5101 PIN4 VO_CLK

PN303 PIN1 IEC958

IC802 PIN4 ADAC_MCLK

IC802 PIN2 ADAC_SCLK

IC802 PIN3 ADAC_LRCK

IC804 PIN4 ADC_SDATA(AI_D0)

IC802 PIN1 DAC_SDATA(AO_D0)

IC502 PIN53 VI_D1

PN7401 PIN 12 VDR_CLK

PN7401 PIN 13 VDR_DIN

PN7401 PIN 14 VDR_DOUT

PN7401 PIN 15 VDR_ENB

Page 76

3-89 3-90

EE PB REC

MODE

PIN NO.

IC1201

IC302

IC402

IC405

16 0.19 0.19 0.19

17 0.19 0.19 0.19

18 3.29 3.29 3.29

19 0.19 0.19 0.19

20 0 0.19 0.19

21 0 0 0

22 0.19 0.19 0.19

23 0 0.19 0.19

24 3.28 3.29 3.29

25 3.29 3.29 3.29

26 0 0 0

27 0 0 0

28 0 0 0

29 0 0 0

30 0 0 0

31 3.29 3.29 3.29

32 0 0 0

33 0 0 0

34 0 0 0

35 0 0 0

36 0 0 0

37 0 0 0

38 0 0 0

39 0 0 0

40 0 0 0

41 0 0 0

42 3.29 3.28 3.29

43 0 0 0

44 0 0 0

45 0 0 0

46 0 2.92 0

47 0 2.92 0

48 3.29 3.29 3.29

10 0 0

2 0 0.04 0.04

3 0 0.04 0.04

40 0 0

5 0 3.29 3.29

6 0 3.29 3.29

7 3.14 3.29 3.29

8 0 0.04 0.04

9 0 0.04 0.04

10 0 0 0

11 0 0.04 0.04

12 0 0.04 0.04

13 0 0.04 0.04

14 0 0.04 0.04

15 0 0 0

16 0 0.04 0.04

17 0 0.04 0.04

18 0 3.29 3.29

19 0 0.04 0.04

20 0 0.04 0.04

21 0 0 0

EE PB REC

MODE

PIN NO.

IC406

22 0 0.04 0.04

23 0 3.29 3.29

24 0 0 0

25 0 0.01 0.01

26 0 0 0

270 0 0

28 0 0 0

29 0 0 0

30 0 0 0

31 0 3.29 3.29

32 0 0 0

33 0 0 0

34 0 0 0

35 0 0 0

36 0 0 0

37 0 0 0

38 0 0 0

39 0 0 0

40 0 0 0

41 0 0 0

42 3.16 3.29 3.29

43 0 0 0

44 0 0 0

45 0 0 0

46 0 0 0

47 0 0 0

48 0 0 0.01

1 0 0.001 0.001

2 0 0.002 0.004

30 0 0

4 3.22 3.256 3.255

5 3.22 3.256 3.255

60 0 0

7 0 0.002 0.002

8 0 0.001 0.002

9 0 0.001 0.002

10 0 0 0

11 1.78v 1.854 1.851

12 1.78 1.854 1.851

13 0 0 0

14 1.78 1.854 1.851

15 0 0 0

16 0 0.002 0.002

17 0 0.001 0

18 0 0.002 0.002

19 0 0 0

20 3.22 3.255 3.255

21 3.22 3.255 3.255

22 0 0 0

23 1.08 0.17 0.17

24 0. 0 0

25 1.78 1.852 1.848

26 0 0 0

27 0 0 0

EE PB REC

MODE

PIN NO.

IC502

28 3.24 3.254 3.253

29 3.22 3.255 3.25

30 0 0.954 0.978

31 1.7 1.855 1.852

32 0 0 0

33 0 0 0

34 3.22 3.254 3.252

35 0 1.029 0.964

36 0 1.029 0.522

37 0 0 0

38 3.24 3.252 3.252

39 0 0 0

40 2.54 1.566 1.566

41 1.78 1.855 1.854

42 90m 0 0

43 3.08 1.642 1.642

44 2.88 1.643 0.199

45 2.88 0.399 0.405

46 2.92 1.299 1.303

47 2.68 0.369 0.37

48 3.24 3.252 0.252

49 0 0 0

50 2.64 0.372 0.376

51 2.64 0.369 0.379

52 2.64 0.382 0.372

53 2.64 0.392 0.397

54 2.64 1.855 0.382

55 1.28 0.39 1.852

56 20m 1.855 0

57 3.24 0 0.866

58 0 1.059 0.7

59 0 1.056 0.759

60 0 1.05 0.716

61 3.24 3.253 3.252

62 0 0 0.099

63 0 0.944 1.004

64 0 0.965 0.669

65 0 0.879 0.93

66 0 0.943 1.034

67 1.78 1.856 1.852

68 0 0 0

69 0 0 0

70 3.18 1.022 1.054

71 0 1.53 1.53

72 0 2.942 2.942

73 0.8m 0.082 0.082

74 0.8m 0.082 0.861

75 0 0.792 0.672

76 1.78 1.852 1.848

77 0 0 0

78 1.78 1.853 1.849

79 0 0 0

80 0 0.001 0.003

1 1.32 1.322 1.325

EE PB REC

MODE

PIN NO.

2 0 0.004 0.006

3 32m 0.314 0.321

4 0 0.397 0.402

5 3.22 3.091 3.224

6 3.24 3.079 3.204

7 0 0.007 0.006

8 1.36 1.423 1.422

1 0 20mv 1.122

2 0 0.005 0.01

3 0 0.004 0.009

4 2.04 1.628 1.616

5 0 0.006 0.008

6 3.21 3.232 3.186

7 3.18 3.206 3.16

8 3.18 3.229 3.183

9 3.22 1.57 1.812

10 2.82 0.969 1.068

11 2.82 1.316 0.996

12 2.88 1.381 1.492

13 2.9 0.982 1.152

14 3.26 1.25 1.092

15 3.26 1.232 1.07

16 2.96 1.206 1.111

17 3.22 3.246 3.183

18 0 0.006 0.005

19 0 0.262 0.18

20 3.24 3.247 3.192

21 3.24 3.246 3.19

22 0 0.006 0.007

23 0 0.006 0.008

24 1.06 0.941 0.943

25 3.24 3.215 3.19

26 0 0.006 0.008

27 1.08 0.827 0.91

28 2.24 3.216 3.197

29 0 0.006 0.019

30 0 0.796 0.872

31 3.22 3.216 3.194

32 0 0.006 0.006

33 0 0.007 0.008

34 3.24 3.185 3.165

35 0 0.006 0.007

36 3.24 3.207 3.19

37 0 0.009 0.01

38 0 0.006 0.007

39 3.234 3.204 3.188

40 3.24 3.212 3.199

41 3.24 3.21 3.197

42 3.24 3.209 3.195

43 20m 0.009 0.011

44 20m 0.005 0.007

1 3.24 3.12 2.52

2 23.24 3.12 2.5

EE PB REC

MODE

PIN NO.

IC5101

IC802

IC501

3 3.24 3.18 1.68

4 2.24 2.82 1.64

5 3.16 3.14 1.65

6 0 0 1.64

7 3.24 3.24 1.64

8 3.22 3.24 0

9 3.22 3.24 4.94

10 3.22 3.24 4.94

11 3.24 3.24 3.25

12 1.22 1.12 3.25

13 12.2v 3.36 0.01

14 14.2v 1.2 3.25

15 4.28 0 2.42

16 0 14.2 2.49

17 14.2v 12.1 2.41

18 4.34 4.34 2.41

19 14.2 12.2 2.48

20 3.21 3.22 4.95

21 0 0 0.01

22 4.79 4.78 4.79

23 4.91 4.91 4.91

24 2.52 2.51 2.51

25 2.42 2.41 2.41

26 2.42 2.41 2.41

27 2.52 2.52 2.51

28 4.89 4.88 4.89

IC601 EE NO Conn. REC

1 2.64 2.64 1.62

2 3.42 3.52 1.06

3 3.42 3.48 0.01

4 3.54 3.58 0.5

5 3.56 3.62 0.5

6 0 0 0.02

7 0 0 0.02

8 0 0 0.02

9 0 0 0.02

10 0 0 0.02

11 0 0 0.02

12 0 0 0

13 3.26 3.27 3.26

14 0 0 0

15 0 0 0

160 0 0

17 0 0 0

18 0 0 0

19 3.04 3.24 3.23

20 3.04 3.26 3.11

21 3.04 3.26 3.26

22 3.04 3.2 3.25

23 0 0 0

24 0 0 0

25 3.24 3.24 3.26

26 0 0 0

27 0 0 1.83

28 0 0 1.83

EE PB REC

MODE

PIN NO.

29 3.12v 3.08 1.81

30 3.12v 3.12v 1.81

31 3.12 3.08v 1.82

32 0 0 0

33 0 0 0

34 1.24 1.22 1.21

35 3.24 1.22 3.26

36 0 8 0

37 3.24 3.1 3.26

38 0 1.48 0

39 1.34 3.22 1.4

40 3.28 3.28 3.26

41 0 3.22 0

42 1.48 1.48v 1.49

43 1.48 1.48v 1.49

44 2.96 3.24 3.26

45 3.24 3.24 3.26

46 0 0 0

47 0 0 0

48 2.88 2.88 0

EE PB REC

MODE

PIN NO.

• CIRCUIT VOLTAGE CHART

10 0 0

20 0 0

3 1.02 1.02 1.23

4 1.02 1.01 1.23

5 2.37 2.48 2.47

6 2.34 2.48 2.47

7 2.34 2.48 2.47

8 1.08 1.22 1.22

10 0 0

2 3.14 3.29 3.27

3 4.88 4.96 4.96

40 0 0

50 0 0

6 4.88 0.01 0.01

70 0 0

8 4.94 3.97 3.97

9 3.22 2.64 2.64

10 0 0 0

11 4.88 4.2 4.2

12 4.96 4.3 4.3

13 0 0 0

14 4.84 4.97 4.97

1 3.14v 3.29 3.29

2 3.14v 3.32 3.32

3 3.14v 3.29 3.29

4 0.04 0.04 0

5 0 0.04 0

60 0 0

70 0 0

8 3.14 3.29 3.29

9 3.14 5.09 5.9

10 3.14 3.29 3.29

11 3.14 3.29 3.29

12 4.98 5.09 5.09

13 3.14 3.29 3.29

14 3.14 3.29 3.29

1 3.28 3.28 3.29

2 3.31 0.19 0.19

3 3.22 0.19 0.19

40 0 0

5 0.19 0.19 0.19

6 0.19 0.19 0.19

7 3.29 3.29 3.29

8 0.19 0.19 0.19

9 0.19 0.19 0.19

10 0 0 0

11 0.19 0.19 0.19

12 0.19 0.19 0.19

13 0.19 0.19 0.19

14 3.31 0.19 0.19

15 0 0 0

Page 77

3-91 3-92

PRINTED CIRCUIT DIAGRAMS

1. VDR P.C.BOARD(TOP VIEW)

Page 78

3-93 3-94

2. VDR P.C.BOARD (BOTTOM VIEW)

Page 79

Page 80

DECK MECHANISM PARTS LOCATIONS

• Top View......................................................4-1

• Bottom View ...............................................4-1

DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM

01.Disassembly of Drum assembly................4-2

02.Disassembly of Plate top disassembly..... 4-4

03.Holder Assembly CST...............................4-4

04.Disassembly of Gear Assembly

Rack F/L ....................................................4-4

05.Opener Door .............................................4-4

06.Arm Assembly F/L.....................................4-4

07.Lever Assembly S/W.................................4-4

08.Motor Assembly L/D..................................4-5

09.Gear Wheel ...............................................4-5

10.Arm Assembly Cleaner..............................4-5

11. Head F/E ...................................................4-5

12.Base Assembly A/C Head .........................4-5

13.Brake Assembly T .....................................4-6

14.Arm Assembly Tension..............................4-6

15.Reel S / Reel T..........................................4-6

16.Base Assembly P4 ....................................4-7

17.Opener Lid ................................................4-7

18.Arm Assembly Pinch .................................4-7

19.Arm T/up ...................................................4-7

20.Supporter, Capstan ...................................4-8

21.Belt Capstan/Motor Capstan .....................4-8

22.Lever F/R ..................................................4-8

23.Clutch Assembly D37................................4-8

24.Gear Drive/Gear Cam ...............................4-9

25.Gear Sector...............................................4-9

26.Brake Assembly Capstan..........................4-9

27.Plate Slider................................................4-9

28.Lever Tension ............................................4-9

29.Lever Spring..............................................4-9

30. Lever Brake..............................................4-9

31.Gear Assembly P2/Gear Assembly P3 ...4-10

32.Base Assembly P2/Base Assembly P3...4-10

33.Base Loading ..........................................4-10

34.Base Tension ...........................................4-11

35.Arm Assembly Idler Jog ..........................4-11

DECK MECHANISM ADJUSTMENT

• Fixtures and tools for service ................4-12

1. Mechanism Assembly Mode Check ........4-13

2. Previous Preparation for

Deck Adjustment .....................................4-14

3. Torque Measuring ...................................4-14

4. Guide Roller Height Adjustment..............4-15

4-1. Prior Adjustment...............................4-15

4-2. Fine Adjustment ...............................4-15

5. Audio/Control (A/C) Head Adjustment......4-16

5-1. Prior Adjustment...............................4-16

5-2. Tape Path Check between Pinch

Roller and Take-up Guide ................4-17

5-3. Fine Adjustment

(Azimuth Adjustment).......................4-17

6. X-distance Adjustment ............................4-17

7. Adjustment after Drum Assembly

(Video Heads) .........................................4-18

8. Tachometer Adjustment of

Deck Assembly........................................4-18

8-1. Check of Audio, RF Normalization

Time (Locking Time) in Play after

CUE or REV.....................................4-18

8-2. Check of Tape Curl and

Jam Status .......................................4-18

PROTECTION, MAINTENANCE AND CHECK OF VIDEO FUNCTION

1. Checking Points before Repair ...............4-19

2. Essential Check and Repair....................4-20

3. Regular Check and Repair......................4-20

4. Tools for Check and Repair.....................4-20

5. Maintenance Process..............................4-20

5-1. Removal of Foreign Materials..........4-20

5-2. Grease Application...........................4-21

TROUBLESHOOTING GUIDE

1. Deck Mechanism.....................................4-23

2. Front Loading Mechanism.......................4-26

EXPLODED VIEWS

1. Front Loading Mechanism Section...........4-28

2. Moving Mechanism Section(1).................4-29

3. Moving Mechanism Section(2).................4-30

SECTION 4 MECHANISM OF VCR PART(D-37)

CONTENTS

Page 81

DECK MECHANISM PARTS LOCATIONS

4-1

• Top View

• Bottom View

21 24 23

31 32 25 34

28 27 29

1 Drum Assembly 3 screws A-1 T

2 Plate Top 2 hooks A-2 T

2 3 Holder Assembly CST 6 chasses A-2 T

2,3 4 Gear Assembly Rack F/L 1 hook A-2 T

2,3,4 5 Opener Door Chassis Hole A-2 T

2,3,4,5 6 Arm Assembly F/L Chassis Hole A-2 T

7 Lever Assembly S/W Chassis Hole, A-2 T

1 hook

8 Motor Assembly L/D 1 screw A-3 T

9 Gear Wheel 2 hooks A-3 T

10 Arm Assembly Cleaner Chassis Embossing A-3 T

11 Head F/E Chassis Embossing A-3 T

12 Base Assembly A/C Head 1 screw A-3 T

2,3 13 Brake Assembly T 1 hook A-4 T

2,3 14 Arm Assembly Tension 1 hook A-4 T

2,3,13,14 15 Reel S / Reel T Shaft A-4 T

16 Base Assembly P4 Chassis Embossing A-5 T

17 Opener Lid Chassis Embossing A-5 T

17 18 Arm Assembly Pinch Shaft A-5 T

17 19 Arm T/up 1 hook A-5 T

20 Supporter, capstan Chassis Hole A-6 B

17,18 21 Belt Capstan/Motor Capstan 3 screws A-6 B

22 Lever F/R Locking Tab A-6 B

21, 22 23 Clutch Assembly D37 Washer A-6 B

24 Gear Drive/Gear Cam Washer/Hook A-7 B

25 Gear Sector Hook A-7 B

21 26 Brake Assembly Capstan Chassis Hole A-7 B

21,22,23, 27 Plate Slider Chassis Guide A-7 B

24,2526

21,22,23, 28 Lever Tension 1 Hook A7 B

24,2526,27

21,22,23, 29 Lever Spring 1 Hook A-7 B

24,2526,27

21,22,23, 30 Lever Brake 1 Hook A-7 B

24,2526,27

25 31 Gear Assembly P2/ Bass A-8 B

Gear Assembly P3

2, 3, 14, 32 Base Assembly P2 6 Chasses A-8 B

25, 31 /Base Assembly P3

25, 31 33 Base Loading 3 Hooks A-8 B

2,3,14 34 Base Tension Chassis Embossing A-9 T

35 Arm Assembly Idler Jog Locking Tab A-9 T

Starting No.

Procedure

Part Fixing Type

Ref.

Draw-

ings

Posi

tion

NOTE : When reassembling, perform the

procedure in the reverse order.

(1) When reassembling, confirm Mechanism and Mode

Switch Alignment Position

(2) When disassembling, the Parts in the "Starting No."

column should be removed first."

T:Top, B:Bottom

33 14

8 12 18

16 17

13 15

Page 82

4-2

DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM

Cap, FPC

Drum Assembly

Flat Cable

(S1)

Holder FPC

1. Disassembly of Drum Assembly (Figure A-1)

1) Separate the flat cable from the Drum FPC and the

Capstan Motor.

2) Release 3 screws (S1) on the bottom side of the chassis,

and separate the drum assembly.

3) Release the hooks (H1, H2) and separate both the holder

FPC and the Cap FPC (disassemble if necessary).

Fig. A-1

Cautions in assembly of FPC

Holder FPC

Drum FPC

Cap FPC

Assembly shape seen in the reverse direction

Page 83

DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM

4-3

(B)

(E)

(C)

Plate Top

Arm Assembly F/L

Gear Assembly Rack F/L

Opener Door

Holder Assembly CST

(B')

(H3)

(A)

(B)

Lever Assembly S/W

(H4)

(E)

Fig. A-2

(Fig. A-2-1)

(Fig. A-2-2)

(Fig. A-2-5)

(Fig. A-2-6)

(Fig. A-2-3)

(Fig. A-2-4)

Page 84

2. Disassembly of Plate Top (Fig. A-2-1)

1) Separate the right part while leaning back the (B) part of

the plate top toward the arrow direction.

2) Separate the left part while leaning back the (B’) part of

the plate top toward the arrow direction. (Tool used: Tool such as (-) driver, auger, etc with pointed or flat end)

CAUTIONS

Assemble while pressing the (C), (C’) part after corresponding them as in drawing.

3. Holder Assembly CST (Fig. A-2-2)

1) Firstly separate the left part from the groove on the (D)

part of chassis while moving the holder assembly CST toward the arrow direction.

2) Separate the right part from each groove of chassis

CAUTIONS

Assemble by inserting the left part after firstly inserting the (E) part of the holder assembly CST into the groove on the (E’) part of chassis.

4. Disassembly of Gear Assembly Rack F/L (Fig. A-2-3)

1) Separate the hook (H3) while leaning ahead the hook (3)

after moving the gear assembly rack F/L toward the arrow (A) direction.

2) Separate the gear assembly rack F/L toward the arrow (B)

direction.

CAUTIONS

For the assembly, correspond the gear part of gear assembly rack F/L to the gear drive.

5. Opener Door (Fig. A-2-4)

1) Separate the opener door ahead from the guide hole of

chassis while turning it clockwise.

6. Arm Assembly F/L (Fig. A-2-5)

1) Firstly separate the left part of the arm assembly F/L from

the groove of chassis while pushing the arm assembly F/L toward the arrow direction.

2) Separate the right part from the groove of chassis.).

7. Lever Assembly S/W (Fig. A-2-6)

1) Separate the lever assembly S/W while pushing it toward

the arrow direction after removing the hook (4) on the left side of chassis.

4-4

DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM

(C')

(C)

(B')

(B)

Holder Assembly CST

(D)

Chassis

Gear Rack F/L

Gear Drive

Chassis

(H4)

Page 85

DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM

4-5

8. Motor Assembly L/D (Fig. A-3-1)

1) Take the connector (C1) connected to the Capstan motor PCB out.

2) Remove a screw (S4) of the chassis (S4) and step backward, and disassemble it while holding it up.

9. Gear Wheel (Fig. A-3-2)

1) Release the hook (H5) of the gear wheel and disassemble it upward.

10. Arm Assembly Cleaner (Fig. A-3-3)

1) Separate the (A) part of Fig. A-3-1 from the embossing of chassis, and hold it up while turning it anti-clockwise.

11. Head F/E (Fig. A-3-4)

1) Separate the (A) part of the head F/E from the embossing of chassis, and hold it up while turning it anti-clockwise.

12. Base Assembly A/C Head (Fig. A-3-5)

1) Release a screw (S5) and disassemble while holding it up.

Fig. A-3

(Fig. A-3-3)

(Fig. A-3-5)

(Fig. A-3-4)

(Fig. A-3-2)

(Fig. A-3-1)

Arm Assembly Cleaner

(A)

(H5)

Gear Wheel

Base Assembly A/C Head

(A)

(S5)

Motor Assembly L/D

Head F/E

(C1)

(S4)

Page 86

4-6

DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM

Fig. A-4

13. Brake Assembly T (Fig. A-4-1)

1) Release the spring tension from the lever spring hook (H6).

2) Disassemble the brake assembly T while holding it upward.

14. Arm Assembly Tension (Fig. A-4-2)

1) Release the spring tension the hook (H7) from the arm assembly tension.

2) After releasing the hook (H8) of the base tension, separate it while holding it up.

CAUTIONS

Spring used for both brake assembly T and arm assembly tension is used (2EA used).

15. Reel S/Reel T (Fig. A-4-3)

1) Disassemble the reel S/ reel T while holding it up (comparison between Reel S and Reel T)

Reel S Reel T

(Fig. A-4-3)

(Fig. A-4-2)

(Fig. A-4-1)

(Fig. A-4-3)

Arm Assembly Tension

(H7)

Reel T

Reel S

Spring Tension

(H8)

Spring Tension

Brake Assembly T

(H6)

Page 87

DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM

4-7

Opener Lid

Arm Assembly Pinch

Base Assembly P4

Arm T/up

(A)

(B)

(C)

Chassis

(C)

(H9)

Fig. A-5

16. Base Assembly P4 (Fig. A-5-1)

1) Release the (A) part of the base assembly P4 from the embossing of chassis.

2) Hold the base assembly P4 up while turning it anti-clockwise.

17. Opener Lid (Fig. A-5-2)

1) Release the (B) part of the opener lid from the embossing of chassis.

2) Disassemble the opener lid upward while turning it anticlockwise.

18. Arm Assembly Pinch (Fig. A-5-3)

1) Hold the arm assembly pinch up.

19. Arm T/up (Fig. A-5-4)

1) Turn the arm T/up to release the anchor jaw (H9) part of chassis and then hold it upward.

CAUTIONS

For the assembly, check the (C) part of the arm assembly pinch is assembled as in drawing.

- REVERSE THE MECHANISM.

(Fig. A-5-2)

(Fig. A-5-1)

(Fig. A-5-3)

(Fig. A-5-4)

Page 88

4-8

DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM

Chassis

(S6)

Belt Capstan

Motor Capstan

Washer(W1)

Lever F/R

Clutch Assembly D37

(L1)

Suppoter Capstan

Fig. A-6

20. Supporter, Capstan (Fig. A-6-1)

1) Turn the supporter and Capstan by 90 deg. clockwise with a driver for disassembly.

21. Belt Capstan (Fig. A-6-2) /

Motor Capstan (Fig. A-6-3)

1) Separate the belt Capstan.

2) Undo 3 screws (S6) on the bottom side of chassis and disassemble it upward.

22. Lever F/R (Fig. A-6-4)

1) Release the locking tab (L1) and then disassemble it upward.

23. Clutch Assembly D37 (Fig. A-6-5)

1) Remove the washer (W1) and then disassemble it upward.

(Fig. A-6-1)

(Fig. A-6-2)

(Fig. A-6-3)

(Fig. A-6-4)

(Fig. A-6-5)

Page 89

DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM

4-9

Fig. A-7

24. Gear Drive (Fig. A-7-1)/ Gear Cam (Fig. A-7-2)

1) Remove the washer (W2) and then disassemble the

gear drive.

2) Release the hook (H10) of the gear cam and then disas-

semble it upward.

CAUTIONS

For the assembly, adjust both the gear driver hole (A) and the gear cam hole (B) straightly and then correspond the gear cam hole (C) to the chassis hole.

25. Gear Sector (Fig. A-7-3)

1) Release the hook (H11) of the gear sector and then hold

the gear sector upward.

26. Brake Assembly Capstan (Fig. A-7-4)

1) Release the locking tab (L2) on the bottom side of the plate slider and then disassemble it upward.

27. Plate Slider (Fig. A-7-5)

1) Disassemble the plate slider while holding it up.

28. Lever Tension (Fig. A-7-6)

1) Release the lever tension from the guide (A) of chassis while turning it anti-clockwise.

2) Disassemble the lever tension while holding it up.

29. Lever Spring (Fig. A-7-7)

1) Release the (B) part of the lever spring from the guide (A) of chassis while turning it anti-clockwise.

2) Disassemble the lever tension while holding it up.

30. Lever Brake (Fig. A-7-8)

1) Disassemble the lever brake while holding it up.

(Fig. A-7-4)

(Fig. A-7-5)

(Fig. A-7-8)

(Fig. A-7-7)

(Fig. A-7-6)

(Fig. A-7-1)

(Fig. A-7-2)

(Fig. A-7-3)

Gear Cam Hole(B)

Gear Cam Hole(C)

Gear Drive Hole(A)

(H10)

(W2)

Gear Cam

Washer (W2)

Gear Drive

Lever Brack

(L2)

(H11)

Gear Sector

Brake Assembly Capstan

(B)

(A)

Plate Slider

Lever Tension

Lever spring

Base Loading

Chassis

Page 90

4-10

DECK MECHANISM DISASSEMBLY

Gear Assembly P3

Gear Assembly P2

Base Assembly P2

Base Assembly P3

(A)

(B)

(H14)

(H12)

(H13)

Chassis

Gear assembly P2 Hole

Gear assembly P3 Hole

Lever Tension Boss

Plate slider Hole(B)

Base Loading

Fig. A-8

31. Gear Assembly P2 (Fig. A-8-1)/ Gear Assembly P3 (Fig. A-8-2)

1) Hold the gear assembly P2 upward.

2) Hold the gear assembly P3 upward.

CAUTIONS

For the assembly, check the holes of both the gear assembly P2 and the P3 are adjusted straightly, and then correspond the gear section groove (A) to the plate slider hole (B).

32. Base Assembly P2 (Fig. A-8-3)/ Base Assembly P3 (Fig. A-8-4)

1) Disassemble the base assembly P2 downward while mov-

ing it toward the arrow (A) direction along with the guide hole of chassis.

2) Disassemble the base assembly P2 downward while mov-

ing it toward the arrow (B) direction along with the guide hole of chassis.

33. Base Loading (Fig. A-8-5)

1) Release 3 hooks (H12, 13, 14) of the base loading, and

then disassemble them upward.

- Reverse the mechanism.

(Fig. A-8-1)

(Fig. A-8-2)

(Fig. A-8-5)

(Fig. A-8-4)

(Fig. A-8-3)

Page 91

DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM

4-11

(A)

(B) (C)

Arm Assembly Idler Jog

Base Tension

Chassis

(D)

Fig. A-9

34. Base Tension (Fig. A-9-1)

1) Release the (A) part of the base tension from the embossing of chassis.

2) Hold the base tension upward while turning it anti-clockwise.

35. Arm assembly Idler Jog (Fig. A-9-2)

1) Push both (B), (C) parts in Fig. A-9-2 toward the arrow direction.

2) Disassemble the arm assembly idler upward.

CAUTIONS

Take care to ensure that the (D) part in the drawing is not hung to chassis in disassembly.

(Fig. A-9-1)

(Fig. A-9-2)

Page 92

DECK MECHANISM ADJUSTMENT

4-12

• Fixtures and Tools for Service

1. Cassette Torque Meter SRK-VHT-303(Not SVC part) Part No:D00-D006

4. Torque gauge adaptor Part No:D09-R001

5. Post height adjusting driver Part No:DTL-0005

6. + Type driver (ø5)

2. Alignment tape Part No NTSC:DTN-0001 PAL:DTN-0002

3. Torque gauge 600g.Cm ATG Part No:D00-D002

SRK

VIDEO

CASSETTE

TORQUE

METER

VHT-303

300

250

200

150

300

250

200

150

100

Page 93

Purpose of adjustment : To make tools normally operate by positioning tools accurately.

DECK MECHANISM ADJUSTMENT

4-13

1) Turn the VCR on and take the tape out by pressing the eject button.

2) Separate both top cover and plate top, and check both the hole (A) of gear cam and the hole (A’) of chassis correspond (Fig. C-2).

3) If it is done as in the paragraph 2): Turn the gear cam as in No.2) after mantling the motor assembly L/D.

4) Undo the screw fixing the deck and the main frame, and separate the deck assembly. Check both the hole (A) of gear cam and the hole (A’) of chassis correspond (Fig. C-1).

5) Check the mode S/W on the main P.C. board locates at a proper position as in (B) of the Fig. (C-1).

6) Connect the deck to the main P.C. board and perform all types of test.

Gear Cam

Gear Drive

(C)

Mode S/W

(B)

Motor Assembly L/D

Gear Cam

Chassis Hole

Gear Cam Hole

(A)

(A')

Fixtures and tools used VCR (VCP) status Checking Position

• Blank Tape (empty tape)

• Eject Mode (with cassette withdrawn)

• Mechanism and Mode Switch

Fig. C-1

Fig. C-2

CHECK DIAGRAM

BOTTOM VIEW

TOP VIEW

Correspondence of the gear cam hole (O)

and the gear drive hole (O)

1. Mechanism Assembly Mode Check

Page 94

Purpose of Measuring : To measure and check the reel torque on the take-up part and the

supply part that performs basic operation of the VCR (VCP) for smoothly forwarding the tape. Measure and check followings when the tape is not smoothly wound or the tape velocity is abnormally proceeded:

4-14

• Torque Gauge (600 g.cm ATG)

• Torque Gauge Adaptor

• Cassette Torque Meter SRK-VHT-303

• Play (FF) or Review (REW) Mode

• Try to operate the VCR (VCP) per mode with the tape not inserted (See ‘2. Prior Preparation for Deck Adjustment).

• Measure after adhering and fixing the torque gauge adaptor to the torque gauge (Fig. C-3-1)

• Read scale of the supply or take-up part of the cassette torque meter (Fig. C-3-2).

DECK MECHANISM ADJUSTMENT

1) Take the power cord from the consent.

2) Separate the top cover and the plate assembly top.

3) Insert the power cord into again.

4) Turn the VCR (VCP) on and load the cassette while pushing the lever stopper of the holder assembly CST backward. In this case, clog both holes on the housing rail part of chassis to prevent detection of the end sensor.

If doing so, proceeding to the stop mode is done. In this status, input signals of all modes can be received. However, operation of the Rewind and the Review is impossible since the take-up reel remains at stop status and so cannot detect the reel pulse (however, possible for several seconds).

2. Previous Preparation for Deck Adjustment

(Preparation to load the VCR (VCP) with cassette tape not inserted)

3. Torque Measuring

NOTE

Adhere the torque gauge adaptor to the torque gauge for measuring the value.

SRK

-3 0

0 2

Fig. C-3-2Fig. C-3-1

Torque Gauge

Torque Gauge Adaptor

Reel Table

Item

Fast forward Torque

Rewind Torque

Play Take-Up Torque

Review Torque

Fast Forward

Rewind

Play

Review

Torque Gauge

VHT-303

Take-Up Reel

Supply Reel

Take-Up Reel

Supply Reel

More than 400g°cm

40~100g°cm

120~210g°cm

Mode Instruments Reel Measured Measuring Value

• Cassette Torque Meter (SRK-VHT-303)• Torque Gauge (600g.cm ATG)

VCR (VCP) status Measuring methodFixtures and tools used

Page 95

Adjustment Procedure

1) Travel the tape and check the bottom surface of the tape travels along with the guide line of the lower drum.

2) If the tape travels toward the lower part of guide line on the lower drum, turn the guide roller height adjusting screw to the left

3) If it travels to the upper part, turn it to the right.

4) Adjust the height of the guide roller to ensure that the tape is guided on the guide line of the lower drum at the inlet/outlet of the drum. (Fig. C-4-1)

DECK MECHANISM ADJUSTMENT

4-15

Fig. C-4-1

GUIDE ROLLER HEIGHT ADJUSTMENT SCREW

ADJUSTMENT DIAGRAM

Purpose of adjustment : To ensure that the bottom surface of the tape can travel along with

the tape lead line of the lower drum by constantly and adjusting and maintaining the height of the tape.

4. Guide Roller Height Adjustment

Fixtures and tools used VCR (VCP) status Adjustment position

• Post Height Adjusting Driver

• Play or Review Mode

• The guide roller height adjusting screw on the supply guide roller and the take-up guide roller

4-1. Prior Adjustment

1) Play the standard test tape after connecting the probe of oscilloscope to the RF envelope output point and the head switching output point.

2) Tracking control (playback) : Locate it at the center (Set the RF output to the maximum value via the tracking control when such adjustment is completed after the drum assembly is replaced.)

3) Height adjusting screw: Flatten the RF waveform. (Fig. C-4-2)

4) Move the tracking control (playback) to the right/left. (Fig. C-4-3)

5) Check the start and the end of the RF output reduction width are constant.

CAUTIONS

There must exist no crumpling and folding of the tape due to excess adjustment or insufficient adjustment.

Fig. C-4-2

P2 POST ADJUSTMENT

P3 POST ADJUSTMENT

CH-1 CH-2

RF ENVELOPE OUTPUT POINT

HEAD RF SWITCHING OUTPUT POINT

Flatten the waveform by lightly turning the guide roller height adjustment screw.

When turning the tracking control to both sides.

OSCILLOSCOPE

When the tracking control locates at the center.

Waveform

Connection Diagram

Fixtures and tools used

Measuring tools and

connection position

VCR (VCP) status Adjustment position

• Oscilloscope

• Standard test tape

• Post height adjusting

driver

• CH-1: PB RF Envelope

• CH-2: NTSC : SW 30Hz PAL : SW 25Hz

• Head switching output

point

• RF Envelope output

point

• Play the standard test tape.

• Guide roller height adjusting screw

4-2. Fine Adjustment

Page 96

4-16

DECK MECHANISM ADJUSTMENT

8.3

Fig. C-5-1

A/C Head Base

Fig. C-5-2

Height Adjustment

Screw(B)

Tilt Adjustment

Screw(C)

Azimuth Adjustment Screw(A)

X-Value Adjustment Hole

Fig. C-5-3

A/C Head

Tape

0.2~0.25mm

A/C Head Assembly

Purpose of adjustment : To ensure that audio and control signals can be recorded and

played according to the contract tract by constantly maintaining distance between tape and head, and tape tension between the P3 post and the P4 post.

5. Audio/Control (A/C) Head Adjustment

Adjustment Procedure/Adjustment Diagrams

1) Basically use the A/C head assembly adjusted as in SPEC.

2) Check there is crumpling and folding of the tape around the A/C head. If it is, Turn and adjust the tilt adjusting screw to ensure that the tape corresponds to the bottom guide of the P4, and recheck the tape path after proceeding play for 4-5 seconds.

3) Where the tape bottom is not equal to Fig. C-5-3, Adjust the height by using the height adjusting screw (B) and then readjust it by using the tilt adjusting screw (C).

CAUTIONS

Always check the height of the A/C head since most ideal height of A/C head can be obtained when the bottom part of the tape is away 0.2 ~ 0.25mm from the bottom part of the A/C head.

Fixtures and tools used VCR (VCP) status Adjustment position

• Blank Tape (Empty Tape)

• Driver (+) Type ø 5

• Play the blank tape (empty tape).

• Tilt adjusting screw (C)

• Height adjusting screw (B)

• Azimuth adjusting screw (A)

5-1. Prior Adjustment (performed only when no audio output appears in play of the standard test tape)

Fixed Screw

Page 97

Adjustment Procedure

1) After releasing the auto tracking, lightly turn the fixing screw. Turn the (+) type driver (Ø 3 ~ Ø 4) on the X-distance adjusting hole to the right or left. Adjust the RF envelope level to the maximum point and then fix the fixing screws.

2) For the 31mm head, adjust it with the SP tape recorded in the width of 31mm since the head travels on the tape track only for SP with the width of 58mm.

DECK MECHANISM ADJUSTMENT

4-17

5-2. Tape Path Check between Pinch Roller and

Take up Guide (Check in the Rev Mode)

1) Check the tape pass status between the pinch roller and the take-up guide.(Check there is crumpling of the tape pass and folding of the take-up guide.)

1) (1) When holding of the take-up guide bottom occurs

Turn the tilt adjusting screw (C) clockwise and travel it stably to ensure there is no crumbling or folding of the tape.

1) (2) When holding of the take-up guide top occurs

Turn the tilt adjusting screw (C) anti-clockwise and

travel it stably to ensure there is no crumbling or folding of the tape.

1) 2) Check there is folding of the tape at the bottom or top

of the take-up guide in cutting-off the REV mode

CAUTIONS

If the RF waveform is changed after adjusting the A/C head, perform fine adjustment to ensure the RF waveform is flattened.

Adjustment Procedure

1) Connect the probe of Oscilloscope to the audio output jack.

2) Ensure that Audio 1KHz, 7KHz output is flattened at the maximization point by adjusting the Azimuth adjusting screw (A).

Fig. C-5-4

Fixtures and tools used Connection position VCR (VCP) status Adjustment position

• Oscilloscope

• Standard test tape

(only for SP)

• Driver (+) Type Ø 4

• Audio Output Jack • Play the standard test

• Tape, 1KHz, 7KHz.

• Azimuth Adjusting Screw (A)

• Height Adjusting Screw (B)

5-3. Fine Adjustment (Azimuth Adjustment)

1KHz

A: Maximum

7KHz

B: Minimum

Fig. C-6

Fixtures and tools used Connection position VCR (VCP) status Adjustment position

• Oscilloscope

• Standard test tape (only for SP)

• Driver (+) Type Ø 4

• CH-1: PB RF Envelope

• CH-2: NTSC ; SW 30Hz PAL:SW 25Hz

• Head switching output

point

• RF Envelope output

point

• Play the standard test tape.

6. X-distance Adjustment

Left

X-distance Adjusting Hole

Tilt Adjusting Screw (C)

Fixing Screw

Height Adjusting Screw (B)

Right

Grove of Base A/C

Purpose of adjustment : To maintain compatibility with other VCR (VCP).

RF ENVELOPE OUTPUT POINT

HEAD RF SWITCHING OUTPUT POINT

OSCILLOSCOPE

Connection Diagram

CH-2CH-1

Azimuth

Adjustment

Screw(A)

Page 98

Checking/Adjustment Procedure

1) Play the blank tape (empty tape) and check whether the guide roller crumbles or wrinkles the tape and adjust it if necessary.

2) Check that the RF envelope output waveform is flat, and adjust the height of the guide roller while playing the standard test tape.

3) Adjust the switching point.

4) Check the RF envelope output is the maximum when the tracking control locates at the center. If not maximum, set up to ensure that RF envelope output becomes the maximum by turning the (+) type driver (Ø 3 ~ Ø 4) on the base A/C groove.

4-18

DECK MECHANISM ADJUSTMENT

8-2. Check of Tape Curl and Jam Status

Fixtures and tools used Connection position VCR (VCP) status Adjustment position

• Oscilloscope

• Standard test tape (only for SP)

• Post Height Adjusting Driver

• Driver (+) Type Ø 5

• CH-1: PB RF Envelope

• CH-2: NTSC : SW 30Hz PAL:SW 25Hz

• Head switching output

point

• RF Envelope output

point

• Play the blank tape.

• Play the standard test tape.

• Fine adjustment of guide roller

• Switching Point

• Tracking Preset

• X-distance

7. Adjustment after Drum Assembly (Video Heads)

Purpose of adjustment : To adjust and stabilize the height change, X-distance change, etc

depending on the guide roller after assembling the drum.

RF ENVELOPE OUTPUT POINT

V2V1V1

V1/V MAX = 0.7 V1/V MAX = 0.8 RF ENVELOPE OUTPUT

HEAD RF SWITCHING OUTPUT POINT

OSCILLOSCOPE

Connection Diagram

Waveform

CH-2CH-1

Checking Procedure

1) Check that locking time of the RF and Audio waveform is fallen within the measuring standard in conversion of the play mode from the CUE or the REV mode.

2) Readjust the paragraph 5 and 6 if it deviates from the standard.

Fixtures and tools used Measuring standard Connection position VCR (VCP) status

• Oscilloscope

• 6H 3KHz Color Bar Standard Test tape

• Stop Watch

• RF Locking Time: Within 5 seconds

• Audio Locking Time : Within 10 seconds

• CH-1: PB RF Envelope

• CH-2: Audio output

• RF Envelope output point

• Audio output jack

• Play the 6H 3KHz Color Bar Standard Test tape.

8. Check of Traveling Device after Deck Assembly

8-1. Audio, RF Normalization Time (Locking Time) Check in Play after CUE or REV

Checking Procedure

1) Check there is no abnormality of every traveling post status.

2) There must be no abnormal operation of the counter in

occurrence of folding of the bottom tape. There must be not abnormality of audio signal in damage of the top tape.

3) If there is abnormality, readjust the adjustment paragraph 4 and 5.

Fixtures and tools used Fixtures and tools used Fixtures and tools used

• T-160 Tape

• T-120 Tape

• There must be no jam or curl at the first, middle and end position of tape.

• Travel the tape at the position of its first and end.

Page 99

PROTECTION, MAINTENANCE AND CHECK OF VIDEO FUNCTION

4-19

(3) F/E Head

(5) Drum Assembly

(Video Head)

(4) Base Assembly P2

(2) Tension Post

(1) Supply Reel

(6) Base Assembly

Phenomena

Replace-

ment

Checking Points and Cause

Color beat Pollution of Full-Erase Head o

S/N, Color Faded Pollution of Video Head o

Horizontal, Vertical Jitte o

CAUTIONS

If operation of the position with (O) mark is abnormal even after removing cause, replace it with substitute product since it shows damage or wearing.

(7) A/C Head

(8) P4 Post

(10) Pinch Roller

(11) Take-up Guide

Post

(9) Capstan Shaft

(12) Take-up Reel

* No. (1) ~ (12) shows sequence that the tape moves from the supply reel to the take-up reel.)

Fig. C-9-1 TOP VIEW

Fig. C-9-2 BOTTOM VIEW

F/E Head

Video Head

A/C Head

Pinch Roller

Belt Capston

Clutch

Assembly A37

Fig. C-9-3 Tape Transport System

Pollution of Video Head or Tape Transport System

Poor Sound, Low Sound o

Pollution of Audio/Control Head

Pollution of Pinch Roller or Belt Capstan Belt

No tape wound or tape wound loosely. FF or REW impossible, or slow turning

Deterioration of Clutch Assembly D37 Torque

Pollution of Drum and Traveling Device

Tape loosely wound in REV or Unloading

Fig. C-9-3

1. Checking Points prior to Repair

Following abnormal phenomena may be repaired by removal of foreign materials and oil supply. Check oiling is required at the checking set or cleaning status is complete. Determine that necessity of checking and repair the set exists after checking the using period of the set together with the user. In this case, followings must be checked:

Page 100

PROTECTION, MAINTENANCE AND CHECK OF VIDEO FUNCTION

4-20

2. Essential Check and Repair

Recording density of the video is far higher than the audio. Therefore video parts are very precise so as to allow only error of 1/1000mm or so in order to maintain compatibility with other videos. If one of these parts is polluted or old, same phenomena will appear as they are damaged. To maintain clear screen, regular check, replacement of old and damaged parts and oil supply, etc are essential.

3. Regular Check and Repair

Check and repair schedule is not constant since they vary depending on method that the consumer uses video and environment where the video is installed at. However, for the video used by common household, good screen will be maintained if regular check and repair per 1,000 hour is performed. The following chart shows relationship between using time and checking time:

4. Tools for Check and Repair

(1) Grease: Floil G-3114 (KANTO) or equivalent grease

(Green) (2) Grease: Kanto G-754, PL-433 (Yellow) (3) Alcohol (Isopropyl Alcohol) (4) Cleaning Patch (cloth)

5. Maintenance Process

5-1) Removal of Foreign Material

(1) Removal of foreign material from video head (Fig. C-9-4)

Firstly try to use a cleaning tape.

(1) Use a cleaning patch if foreign materials are not removed

with the cleaning tape due to severe dirty of the head.

Soak the cleaning patch in alcohol and put it to the head

tip. Smoothly turn the drum (turning cylinder) to the right

or left (In this case, the cleaning patch must not be

moved vertically).

(1) After completely drying the head, test the traveling status

of the tape.

(1) If alcohol (Isopropyl Alcohol) remains at the video head,

the tape may be damaged when this solution touches

with the head surface.

Never use a cloth bar (commercial sale)

(2) Wipe the tape transport system and the drive system

with the cleaning patch soaked in alcohol (Isopropyl

Alcohol) when removing foreign materials from them.

1) The part touched with the traveling tape is called as tape transport system. The drive system consists of parts to travel the tape.

(2) 2) Care must be exercised so that unreasonable force

to change the pattern will be applied to the tape transport system during removal of foreign materials.

About 1 year

One hour

Table 1

Two hours

Three hours

Time

Requiring

Checking

Average hours used per day

About

18 months

About

3 years

Fig. C-9-4

Drum (Turning Cylinder)

Head Tip

Soak alcohol (Isopropyl Alcohol).

Cleaning Patch

(Cloth)

Smoothly turn the drum (turning cylinder) touching the soft surface to the head tip surface.