Zenith GBV441 Schematic

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CONTENTS

SECTION 1 . . . . SUMMARY

SECTION 2 . . . . CABINET & MAIN CHASSIS

SECTION 3 . . . . ELECTRICAL

SECTION 4 . . . . MECHANISM OF VCR PART

SECTION 5 . . . . MECHANISM OF DVD PART

SECTION 6 . . . . REPLACEMENT PARTS LIST

1-2

SECTION 1

SUMMARY

CONTENTS

PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS ............. 1-3

SERVICING PRECAUTIONS .................................................................................................. 1-4

• General Servicing Precautions

• Insulation Checking Prodedure

• Electrostatically Sensitive Devices

SERVICE INFORMATION FOR EEPROM (DVD).............................................................. 1-5

SPECIFICATIONS ...................................................................................................................... 1-6

1-3

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 Zenith 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 Zenith Electronics Corporation.

Circuit diagrams may occasionally differ from the actual circuit used. This way, implementation of the latest safety and performance improvement changes into the set is not delayed until the new service literature is printed.

CAUTION: Do not attempt to modify this product in any way. Never perform customized installations without manufacturer’s approval. Unauthorized modifications will not only void the warranty, but may lead to property damage or user injury.

Service work should be performed only after you are thoroughly familiar with these safety checks and servicing guidelines.

GRAPHIC SYMBOLS

The exclamation point within an equilateral triangle is intended to alert the service personnel to important safety information in the service literature.

The lightning flash with arrowhead symbol within an equilateral triangle is intended to alert the service personnel to the presence of noninsulated “dangerous voltage” that may be of sufficient magnitude to constitute a risk of electric shock.

The pictorial representation of a fuse and its rating within an equilateral triangle is intended to convey to the service personnel the following fuse replacement caution notice:

CAUTION: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ALL FUSES WITH THE SAME TYPE AND RATING AS MARKED NEAR EACH FUSE.

SERVICE INFORMATION

While servicing, use an isolation transformer for protection from AC line shock. After the original service problem has been corrected, make a check of the following:

FIRE AND SHOCK HAZARD

1. Be sure that all components are positioned to avoid a possibility of adjacent component shorts. This is especially important on items trans-ported to and from the repair shop.

2. Verify that all protective devices such as insulators, barriers, covers, shields, strain reliefs, power supply cords, and other hardware have been reinstalled per the original design. Be sure that the safety purpose of the polarized line plug has not been defeated.

3. Soldering must be inspected to discover possible cold solder joints, solder splashes, or sharp solder points. Be certain to remove all loose foreign particles.

4. Check for physical evidence of damage or deterioration to parts and components, for frayed leads or damaged insulation (including the AC cord), and replace if necessary.

5. No lead or component should touch a high current device or a resistor rated at 1 watt or more. Lead tension around protruding metal surfaces must be avoided.

6. After reassembly of the set, always perform an AC leakage test on all exposed metallic parts of the cabinet (the channel selector knobs, antenna terminals, handle and screws) to be sure that set is safe to operate without danger of electrical shock. DO NOT USE A LINE ISOLATION TRANSFORMER DURING THIS TEST. Use an AC voltmeter having 5000 ohms per volt or more sensitivity in the following manner: Connect a 1500 ohm, 10 watt resistor, paralleled by a .15 mfd 150V AC type capacitor between a known good earth ground water pipe, conduit, etc.) and the exposed metallic parts, one at a time. Measure the AC voltage across the combination of 1500 ohm resistor and .15 mfd capacitor. Reverse the AC plug by using a non-polarized adaptor and repeat AC voltage measurements for each exposed metallic part. Voltage measured must not exceed 0.75 volts RMS. This corresponds to 0.5 milliamp AC. Any value exceeding this limit constitutes a potential shock hazard and must be corrected immediately.

TIPS ON PROPER INSTALLATION

1. Never install any receiver in a closed-in recess, cubbyhole, or closely fitting shelf space over, or close to, a heat duct, or in the path of heated air flow.

2. Avoid conditions of high humidity such as: outdoor patio installations where dew is a factor, near steam radiators where steam leakage is a factor, etc.

3. Avoid placement where draperies may obstruct venting. The customer should also avoid the use of decorative scarves or other coverings that might obstruct ventilation.

4. Wall- and shelf-mounted installations using a commercial mounting kit must follow the factory-approved mounting instructions. A product mounted to a shelf or platform must retain its original feet (or the equivalent thickness in spacers) to provide adequate air flow across the bottom. Bolts or screws used for fasteners must not touch any parts or wiring. Perform leakage tests on customized installations.

5. Caution customers against mounting a product on a sloping shelf or in a tilted position, unless the receiver is properly secured.

6. A product on a roll-about cart should be stable in its mounting to the cart. Caution the customer on the hazards of trying to roll a cart with small casters across thresholds or deep pile carpets.

7. Caution customers against using extension cords. Explain that a forest of extensions, sprouting from a single outlet, can lead to disastrous consequences to home and family.

PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS

A.C. Voltmeter

Good Earth Ground such as the Water Pipe, Conduit, etc.

0.15uF

1500 OHM

10 WATT

Place this probe on each exposed metal part.

1-4

SERVICING PRECAUTIONS

CAUTION : Before servicing the VCR+DVD 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.

Remembers Safety First:

General Servicing Precautions

1. Always unplug the VCR+DVD AC power cord from the AC

power source before: (1) Removing or reinstalling any component, circuit board,

module, or any other assembly.

(2) Disconnection 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 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 and/or any of its

electrical assemblies unless all solid-state device heat sinks are cerrectly installed.

6. Always connect test instrument ground lead to the

appropriate ground before connection 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 including 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 grouned-tip soldering iron to solder or unsolder ES devices.

4. Use only an anti-static solder removal device. Some solder removal devices not classified a “anti-static” can generate electrical charges sufficient to damage ES devices.

5. Do not use freon-propelled chemicals. These can generate electrical charge sufficient to damage ES devices.

6. Do not remove a replacement ES device from its protec tive package until immediately before you are ready to install it. (Most replacement ES devices are packaged with leads electrically shorted together by conductive foam, aluminum foil, or comparable conductive material).

7. Immediately before removing the protective material from the leads of a replacement ES device, touch the protective material to the chassis or circuit assembly into which the device will be installed.

Caution : Be sure no power is applied to the chassis or circuit, and observe all other safety precautions.

8. Minimize bodily motions when handling unpackaged replacement ES devices. (Normally harmless motion such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity sufficient to damage an ES device.)

1-5

SERVICE INFORMATION FOR EEPROM (DVD)

POWER ON

DVD LOGO Status (NO Disk status)

Remotecontrol Pause key-->1-->4-->7-->2 in order.

Press number 0~9, Press charater A~F (1~6 for a while)

Use arrow key (

F D G E

) to move to approprite position and make changes

Press pause key once

Change will be applied when power

OFF-->ON.

* OPTION

• NTSC model doesn’t have VCR option and use DVD option B~F as VCR option. (only DVD exist)

• PAL model has another separate VCR option. (Both VCR and DVD exist)

NAME HEX OPT 1 55 OPT 2 53 OPT 3 00 OPT 4 45 OPT 5 12 OPT 6 05 OPT 7 64 OPT 8 00 OPT9 00 OPT A 00 OPT B C0 OPT C 40 OPT D 20 OPT E 00 OPT F 03 OPT G 3D

DETECT NEW EEPROM (OPTION EDIT SCREEN)

1-6

SPECIFICATIONS

• GENERAL

Power requirements AC 120V , 60 Hz Power consumption 19W Dimensions (approx.) 430 X 78.5 X 275 mm (16.9 X 3.1 X 10.8 inches) (w x h x d) Mass (approx.) 8.8 lbs (4.0 kg) Operating temperature 5˚C to 40˚C (41˚F to 104˚F) Operating humidity 5 % to 90 % Signal system NTSC

• INPUTS

ANTENNA IN 75 ohms (VHF/UHF/CATV) VHS VIDEO IN (LINE1, 2) 1 Vp-p 75 ohms, sync negative, RCA jack x 2 VHS AUDIO IN (LINE1, 2) -6.0 dBm more than 47 kohms, RCA jack (L, R) x 2

• OUTPUTS

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

(C) 0.286 V (p-p) 75 ohms COMPONENT VIDEO OUT (Y) 1.0 V (p-p), 75 ohms, negative sync, RCA jack x 1 (Progressive Scan) (Pb)/(Pr) 0.7 V (p-p), 75 ohms, RCA jack x 2 Audio output (digital audio) 0.5 V (p-p), 75 ohms, RCA jack x 1 Audio output (optical audio) 5 V (p-p), 75 Ω, Optical connector x 1 Audio output (analog audio) 2.0 Vrms (1 KHz, 0 dB), 330 ohms, RCA jack (L, R) x 1 RF OUT Channel 3 or 4 (Switchable)

• VCR Specifications

Head system Four head helical scan azimuth system Timer 12-hour display type with AM, PM Tape speed SP: 33.35 mm/sec, LP: 16.67 mm/sec, SLP: 11.12 mm/sec Tape width 12.7 mm Maximum recording time SP: 2 HOURS (T-120), SLP: 6 HOURS (T-120)/8 HOURS (T-160) Rewind time About 3 minutes (T-120) Antenna 75 ohms (VHF/UHF) VHF output signal Channel 3 or 4 (Switchable) Channel coverage VHF: 2-13, UHF: 14-69, CATV: 1-125 (4A, A-W, W+1 - W+84, A-5 A-1) Frequency range 20Hz to 20kHz Signal-to-noise ratio More than 43dB Dynamic range More than 88 dB Channel separation More than 60 dB

• DVD Specifications

Laser system Semiconductor laser, wavelength 650 nm Frequency response DVD (PCM 96 kHz): 8 Hz to 44 kHz,

DVD (PCM 48 kHz): 8 Hz to 22 kHz

CD: 8 Hz to 20 kHz

Signal-to-noise ratio More than 100dB (ANALOG OUT jacks only) Harmonic distortion Less than 0.008% Dynamic range More than 95 dB (DVD/CD)

• Accessories:

Video cable x 1, Audio cable x 1, RF 75-ohm Coaxial Cable x 1, Remote control x 1, Batteries(AAA) x 2

2-1

SECTION 2

CABINET & MAIN CHASSIS

CONTENTS

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

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

2. Packing Accessory Section ....................................................................................................2-3

2-2

EXPLODED VIEWS

1. Cabinet and Main Frame Section

280

A43

260

A44

A26

A00

250

300

462

467

457

467

A46

A47

468

323

265

467

465

330

452

261A

285

274

283

284

286

BCD

2-3

2. Packing Accessory Section

BATTERY

808

BAG

804

PACKING, CASING

803

806

INSTRUCTION ASSEMBLY

CABLE(COAXIAL)

810

CABLE ASS'Y RF

801

REMOTE CONTROLLER ASSEMBLY

900

BOX

802

PACKING, CASING

803

811

812

PLUG ASS'Y 1WAY

PLUG ASS'Y 2WAY

3-1

SECTION 3

ELECTRICAL

CONTENTS

OVERALL WIRING DIAGRAM.....................3-2

VCR PART

ELECTRICAL ADJUSTMENT

PROCEDURES ..................................................3-3

ELECTRICAL TROUBLESHOOTING GUIDE

......................3-4

1. POWER(SMPS) CIRCUIT .............................3-4

2. SYSTEM/KEY CIRCUIT ................................3-7

3. SERVO CIRCUIT ...........................................3-8

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

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

6. HI-FI CIRCUIT..............................................3-15

7. TUNER/IF CIRCUIT .....................................3-18

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

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

2. TU/IF BLOCK DIAGRAM ............................3-22

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

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

5. HI-FI BLOCK DIAGRAM .............................3-28

6. SYSTEM 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. JACK CIRCUIT DIAGRAM..........................3-40

6. SYSTEM CIRCUIT DIAGRAM.....................3-42

7. KEY CIRCUIT DIAGRAM ............................3-44

8. TIMER CIRCUIT DIAGRAM ........................3-46

• WAVEFORMS................................................3-48

• CIRCUIT VOLTAGE CHART.........................3-50

PRINTED CIRCUIT DIAGRAMS................3-52

1. MAIN P.C.BOARD .......................................3-52

2. MAIN P.C.BOARD .......................................3-54

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

DVD PART

ELECTRICAL TROUBLESHOOTING GUIDE & WAVEFORMS

...............................3-58

1. SYSTEM OPERATION FLOW.....................3-58

2. TEST & DEBUG FLOW...............................3-59

DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING

..........3-65

1. SYSTEM 27MHZ CLOCK,

RESET, FLASH R/W SIGNAL .....................3-65

2. SDRAM CLOCK ..........................................3-67

3. TRAY OPEN/CLOSE SIGNAL.....................3-67

4. SLED CONTROL RELATED SIGNAL

(NO DISC CONDITION)...............................3-69

5. LENS CONTROL RELATED SIGNAL

(NO DISC CONDITION)...............................3-69

6. LASER POWER CONTROL RELATED

SIGNAL(NO DISC CONDITION) .................3-70

7. DISC TYPE JUDGEMENT WAVEFORM ....3-70

8. FOCUS ON WAVEFORM ............................3-72

9. SPINDLE CONTROL WAVEFORM

(NO DISC CONDITION)...............................3-73

10. TRACKING CONTROL RELATED

SIGNAL(SYSTEM CHECKING) ................3-74

11. RF WAVEFORM.........................................3-75

12. MT1379 AUDIO OPTICAL AND

COAXIAL OUTPUT (ASPDIF)...................3-75

13. MT1379 VIDEO OUTPUT WAVEFORM....3-76

14. AUDIO OUTPUT FROM AUDIO DAC .......3-77

BLOCK DIAGRAMS ......................................3-79

1. OVERALL BLOCK DIAGRAM ....................3-79

2. SERVO BLOCK DIAGRAM.........................3-80

3. MPEG & MEMORY BLOCK DIAGRAM......3-81

4. VIDEO & AUDIO BLOCK DIAGRAM..........3-82

CIRCUIT DIAGRAMS ....................................3-83

1. SYSTEM CIRCUIT DIAGRAM.....................3-83

2. RF & DSP SERVO CIRCUIT DIAGRAM .....3-85

4. AV/JACK CIRCUIT DIAGRAM ....................3-87

• CIRCUIT VOLTAGE CHART.........................3-89

3-2

OVERALL WIRING DIAGRAM

PMC01

CFG

12VA(CAP)

5.2VA

CAP REV'H'

I-limit

MOTOR GND

GND

12VA(DRUM)

CAP CTL

LD IN

DFG/FG

DRUM CTL

P3D01

SP PB A

SP REC

SP PB B

EP PB B

EP REC

EP PBA

Hi-Fi PB A

Hi-Fi REC

Hi-Fi PB B

PPM01 PMP01

24VA

GND

14VA

GND

5.3VA

33VA

GND

4VA

PMD01 PMD02

Vcc(HF)

DVD_LD

DVD_PD

VOL(DVD)

GND

VC_INPUT

Vcc(HF)

F(+)

T(-)

T(+)

F(-)

Vcc

GND

CD_LD

CD_PD

VOL(CD)

123456789

10111213141516171819202122

123456789

10111213141516171819202122

PMD03

SPM +

SPM -

FM +

FM -

LM -

LM +

SW(OPEN)

SW(CLOSE)

GND

SW(LEAD IN)

GND

123456789

P3D02

CTL(+)

CTL(-)

A/E(+)

A/E(-)

A.REC

A.PB

GND

FULL ERASE

P3D03

DECK MD

ONE

BOARD

SMPS

BOARD

ONE

BOARD

3-3

ELECTRICAL ADJUSTMENT PROCEDURES

1. Servo Adjustment

1) PG Adjustment

• Test Equipment

• Adjustment And Specification

a) OSCILLOSCOPE b) NTSC MODEL : NTSC SP TEST TAPE

MODE

PLAY

• Adjustment Procedure

a) Insert the SP Test Tape and play.

Note - Adjust the distance of X, pressing the Tracking(+) or Tracking(-) when the “ATR” is blink after the

SP Test Tape is inserted. b) Connect the CH1 of the oscilloscope to the H/SW(TP) and CH2 to the Video Out for the VCR. c) Trigger the mixed Combo Video Signal of CH2 to the CH1 H/SW(TP) and then check the distance (time

difference), which is from the selected A(B) Head point of the H/SW(TP) signal to the starting point of the vertical synchronized signal, to 6.5H ± 0.5H (412µs, 1H=63µs).

• PG Adjustment Method

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

time, then it goes in to Tracking initial mode. c-3) Repeat the above step(No.b-2), then it finishes the PG adjusting automatically. d-4) Stop the playback, then it goes out to 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

V.Out

H/SW

(TP)

OSCILLOSCOPE

CH1 CH2

V.outH/SW

R/C KEY

(TP)

H/SW

Composite

VIDEO

6.5H(412µs)

VCR PART

3-4

ELECTRICAL TROUBLESHOOTING GUIDE

Check or Replace the D102.

Replace the D111.

Replace the D110.

Replace the D113.

YES

Is the D113 normal?

Power Line of Main PCB is short.

1. Power(SMPS) CIRCUIT

NO 5.3VA.

Replace the F101.

(Use the same Fuse)

Is the F101 normal?

Is the R101 normal?

Is the BD101 normal?

Replace the BD101.

Replace the R101.

Is the D102 normal?

Replace the D118 (MTK)/D112(ST).

Replace the IC103.

YES

Is Vcc(9V~18V) supplied to IC101 Pin2?

Are the

D118 (MTK)

/D112(ST) normal?

Are the about 2.5V at the IC103 Pin1?

Is the D111 normal?

Is the D110 normal?

(1) No 5.3VA (SYS/Hi-Fi/TUNER)

3-5

NO 33V.

Is the Vcc(33V) supplied to Q161 Emitter?

Check or Replace the D113.

Is the Q162 Base “H”?

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

Check or Replace the Q161

YES

(5) No 33V

NO 5V.

Check or Replace the D118.

Is the Vcc(5.3V) supplied to Q160 Emitter?

Check or Replace the Q160

Is the Q162 Base “H”?

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

YES

(2) No 5V

No 3.3V.

Check or Replace the D111

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

Is there about 3.7V at the IC152 pin1?

Is there about 3.3V~ 5V at the IC152 pin4?

Check the IC152 and Replace

YES

(3) No 3.3V

No SW5V

Check or Replace the D118.

Is the Vcc(5.3V) supplied to Q163 Emitter?

Is the Q164 Base “H”?

NO NO

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

NO NO

YES

Check or Replace the Q163

YES

(4) No SW5V

3-6

NO 13VA.

Check or Replace the D110.

Is the Vcc(13V) supplied to C123?

Check or Replace the cap/Drum

Is the D117/D115 Normal?

Replace the D117/D115.

YES

(6) No 13V(TO Cap, Drum Motor)

NO 8V.

Is there about 13V at the IC151 pn1?

YES

Is there about 3.3V~ 5V at the IC151 pin4?

YES

Check the IC151 and Replace

YES

(7) No 8V

Check or Replace the D110.

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

NO 33V.

Is the Vcc(12V) supplied to Q165 Collector?

Check or Replace the D110.

Is the Vcc(10V) supplied to Q165 Base

Check or Replace the ZD171.

Check or Replace the Q165

YES

(9) No 9V

No REG 12V

Check or Replace the D110.

Is the Vcc(13V) supplied to Q156 Collector?

Is the Vcc(13V) supplied to Q156 Base

NO NO

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

Check the 33V Line

NO NO

YES

Check or Replace the Q156

YES

(8) No REG 12V

3-7

2. SYSTEM/KEY CIRCUIT

(1) AUTO STOP

(2) The unstable loading of a Cassette tape

Auto Stop

Does the SW30 waveform appear at the IC501 Pin18?

Do the T-UP Reel Pulses appear at the IC501 Pin80?

Is 12V applied to the

PMC01 Pin8?

Check the Drum Motor signal.

Does 5V appear at the RS501?

Check the Q160 Power Circuit.

Refer to “SMPS DRUM 12 Volt Trouble Shooting”.

Is 5V applied to the R531 ?

Refer to SMPS 5.3VA troubleshooting.

Check the IC501 Pins22, 23, 24, 25.

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

Replace the T/UP Reel Sensor (RS501).

Check the CST SW and the peripheral circuitry.

Replace the IC501.

The unstable loading of a Cassette tape

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

Does the “L” signal appear at the IC501 Pin19 during inserting the CST?

Check the Deck Mechanism.

Caution :

Auto stop can occur because Grease or Oil is dried up

YES

NO NO

YES

YES YES

3-8

3. SERVO CIRCUIT

(1) Unstable Video in PB MODE

Unstable Video in PB Mode.

Does the Noise level of the screen change periodically?

Do the CTL pulses appear at the 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 the IC501 Pin9?

Replace the IC501.

YES

(2) When the Drum Motor

(2) doesn’t run.

Do the DFG Pulses appear at the PMC01 Pin11?

Replace the DRUM-M or CAP-M.

Aren’t the foil patterns and

the Components between IC501 Pin 90 and PMC01 Pin11 short?

Replace the IC501.

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

Do the Drum PWM Pulses appear at the IC501 Pin76?

Aren’t the foil patterns and the Components between IC501 Pin76 and PMC01 Pin12 short?

Do the DFG Pulses appear at the IC501 Pin90?

Do the Drum PWM Pulses appear at the IC501 Pin76?

Aren’t the connecting patterns and the Components between IC501 Pin76 and PMC01 Pin12 short?

When the Drum Motor doesn’t run,

Does 12V appear at the PMC01 Pin8?

Does 2.8V appear at the PMC01 Pin12?

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

YES

3-9

Does the CFG signal appear at the PMC01 Pin1?

Does the PWM signal appear at the IC501 Pin77?

Does 2.8V appear at the PMC01 Pin 9?

Check the PMC01 and the Capstan Motor Ass’y.

Does the Capstan PWM signal appear at the IC501 Pin77?

Aren’t the foil patterns and Components between IC501 Pin77 and PMC01 Pin9 short?

Does the CFG signal come into the 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 the 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 short?

Check the Capstan Motor Ass’y.

3-10

4. OSD CIRCUIT

(1) No OSD display.

(2) I

C BUS CHECK

KEY doesn’t working.

Is 5V applied to the IC501 Pin99?

Does LED or FLD change when a function button is pressed?

No OSD or F.OSD display.

Is 5.3V applied to the IC501 Pin53?

Does oscillation occur at the IC501 Pins44, 45?

Replace the IC501.

The I2C waves don’t come out.

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

Replace the IC501.

Refer to “SMPS 5.3VA Trouble Shooting”.

Replace the defective switches.

Refer to “SMPS 5.3VA Trouble Shooting”.

Check or Replace the pheripheral Circurity.(L511, R518, C596, C595)

Refer to “SMPS 5.3VA Trouble Shooting”.

YES

2. SERVO CIRCUIT

(4) KEY doesn’t working

3-11

5. Y/C CIRCUIT

(1) No Video in EE Mode,

No Video in EE Mode

Check the Tuner Pin16V

Check the SW 5V, 5.3VA Line.(Power Circuit)

Is I2C BUS signal applied to the IC301 Pins73, 74?

Does the Video signal appear at the IC301 Pin15?

Is 5.0V applied to the IC301Pins4, 22, 47, 60, 84?

Does the Video signal appear at the IC301 Pin29?

Does the Video signal appear at the IC501 Pin52?

Does the Video signal appear at the IC602 Pin7?

Check the path of the signal between the IC301 Pin 29 and IC501 Pins50.

Is there Vcc 5V on the IC602 Pin6

Does the Video signal appear at the IC602 Pin1(DVD MODE)

Replace the IC602.

Check the 5V. (Power Circuit)

Check the C327.(AGC)

Check the System Circuit.

YES

3-12

3. Y/C CIRCUIT

(2) When the Y(Luminance) signal doesn’t appear on the screen in PB Mode,

Is 5.2VT, 5.3VA applied to the IC301 Pins22, 47, 60, 84?

Is the Y/C Bus siganl applied to the IC301 Pins73, 74?

Does the normal RF signal appear at the IC301 Pin 6?

Check the SW 5V Line. (Power Circuit)

Check the System Circuit. (IC501 Pin18)

Check the V.H.S/W level. (Check R328)

Check the IC301

Refer to ‘SYSTEM I2C BUS CHECK Trouble Shooting’.

Is the V.H.S/W signal applied to the IC301 Pin70?

Is V.H.S/W “H” about 3.4V at the IC301 Pin 80?

Clean the Drum.

Check the path of the Y(Luminance) RF signal. (C337, C340)

Does the Y(Luminance) signal appear at the IC301 Pin9?

Is the Y(Luminance) Video waveform showed up at the IC301 Pin43?

Replace the IC301.

YES

3-13

3. Y/C CIRCUIT

(3) When the C(Color) signal doesn’t appear on the screen in PB Mode,

Is 5.2VT/5.3VA applied to the IC301 Pins 22, 47, 60, 84.

Is the Color signal applied

to the IC301 Pin 57?

Check the SW 5V, 5.3V Line. (Power Circuit)

Replace the X301.

Check the Color Pass.

Is normal the X301 (3.58MHZ) of oscillation Frequency?

Replace the IC301.

Does the Color signal appear at the IC301 Pin55?

Replace the IC301.

YES

3-14

3. Y/C CIRCUIT

(4) When the Video signal doesn’t appear on the screen in REC Mode,

Is the EE signal normal?

Is 5.2V/5.3VA applied to the IC301 Pins 4, 22, 47, 60, 84?

Does the REC RF signal appear at the IC301 Pin76?

Check EE Mode.

Check the system of REC”H”(IC501 pin74)

Replace the IC301.

Check the SW 5V/ 5.3VA Line.(Power Circuit)

Check PB Mode.

Does the REC “H”(4V~5V) signal appear at the Q303, Q307 Base?

Check the REC Luminance Pass and Color Pass.

Does PB Mdoe operate normally?

YES

Does the REC RF signal appear at the IC301 Pins86, 90?

Check the Drum & Drum Connector.

YES YES

YES

3-15

6. Hi-Fi CIRCUIT

(1) No Sound(EE Mode)

YES

No Sound.

Check the SIF.IN of IC801 Pins57.

Check the DVD Audio of IC801 Pins12, 74.

Check the AV1 Audio of IC801 Pins11, 73.

Check the AV2 Audio of IC801 Pins9, 71.

Check the Vcc of IC801 Pins3, 5, 15, 32, 36, 46, 54.

YES

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

YES

Check the Audio of IC801 Pins78, 80.

YES

Check the Audio of C804, C854.

YES

Check the JK601.

Check the TU701 SIF Pin13.

Check the DVD MODULE. (PMD02 Pins13, 15).

Check the Rear Jack. (JK601 Audio in).

Check the front Jack. Timer (JK602, JK603).

Check the Power 5.2V, 5.3VA, REG 9V. Q701, PMP01 Pins1, 2, 5, 6.

YES

Check the IC501 Pins71, 72.

Replace IC801.

Replace C804, C854.

3-16

3. Y/C CIRCUIT

(2) Hi-Fi Playback

YES

PB mode

No Sound.

Check the Vcc of IC801 (Pins3, 5, 15, 32, 36, 46, 54).

Check the Hi-Fi Selection switch. (IC801 Pin39) and the Tape quality.

Is the RF Envelope at IC801 Pin23 over 3Vp-p?

YES

Check IC801 Pin37(Data), Pin38(Clock)

YES

Do Audio Signals appear at IC801 Pin80(L-CH), 78(R-CH)?

YES

Do Audio Signals appear at JK601?

Check Power.

Check IC501 Pin19 (A.H/SW)

Check the parts of µ-COM (IC501 Pins71, 72)

Check the Connection at P3D01 Pins7, 9.

Check the Jack(JK801)

Check C801, C851, R801, R851.

YES

3-17

(3) Hi-Fi REC

Hi-Fi REC.

It is impossible to record Hi-Fi Audio signal.

Check Vcc of IC801. (Pins3, 5, 15, 32, 36, 46, 54)

YES

Check IC801 Pin37(Data), Pin38(CLOCK).

YES

Do Audio signals appear at IC801 Pin6?

YES

Do Audio signals appear at IC301 Pin76(Normal Audio)?

YES

Do OSC signals appear at P3D02 pins4,5 (50Vp-p)

YES

Check Power.

Check ports of µ-CPM. (IC501 Pins71, 72)

Check Audio input signal of IC801 Pin57(TU.A.), 7, 69(DVD.A.), 11, 73(AVI.A.), 9, 71(AV2.A.)

Check C825, C306, R311, R312, R346.

Check REC OSC BLOCK (FL301, Q301~Q305, Q308, Q309)

Is “High” IC501 Pin74 in REC mode.

3-18

7. Tuner/IF CIRCUIT

(1) No Picture on the TV screen

No picture on the TV screen

Does the Video signal at the TU701 Pin16.

YES

Is +33V applied to TU701 Pin14?

YES

Is +5V applied to TU701 Pin3?

Does the Video signal at the IC501 Pin 52.

Does the Video signal at the IC609 Pin 23.

YES

Check the signal flow from IC609 Pin23 to JK901 Pin Video out.

YES

Check 33V line.

Check 5V line.

YES

Does the Clock signal appear at TU701 Pin9?

Check the lIC Clock Signal of µ-COM Pin71.

YES

Does the data signal appear at TU701 Pin10?

Replace Tuner.

Check the signal from IC301 Pin29 to IC501 Pin50.

Check the signal from IC501 Pin52 to IC609 Pin4.

Check the lIC Data Signal of µ-COM Pin72.

3-19

(2) No Sound

No Sound.

Check the Vcc of TU701 Pins3, 14.

YES

Check 5.2V, 33V Line.

Check the Tuner SiF signal at IC801 Pin57.

YES

Check the Audio of IC801 Pins78, 80.

YES

Check the Signal flow from IC801 Pins78, 80 to JK901 Audio out(L), (R)

YES

Check the Tuner SIF of TU701 Pin13.

1. Check the Vcc(5.3VA, 9V) of IC801 Pins3, 5, 36, 54.

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

3-20 3-21

BLOCK DIAGRAMS

1. POWER(SMPS) BLOCK DIAGRAM

BD101

T101

TRANS

R101

BR BL

(BK)(WH)

C103

FUSE

(F101)

NOISE FILTER

BLOCK

(C101,L102,

C102)

PHOTO COUPLER

(IC102)

ERROR

AMP

(IC103)

SNUBBER

BLOCK (D101,C105 C106,R104)

DRIVE & S/W BLOCK

(IC101, D102, R105,

C104, C109 , C135)

Y-CAP

C111

Y-CAP

C110

FEED-BACK

BLOCK R112,R113, C133,R114.

R115,R116

R117)

RECTIFIER &

SMOOTING BLOCK

(D110,C123,C163,

R133,L122,C126)

RECTIFIER &

SMOOTING BLOCK

(D118,D112,C129,

C131,L124,L125)

RECTIFIER &

SMOOTING BLOCK

(D111,C127,L123,

C128)

RECTIFIER &

SMOOTING BLOCK

(D113,C132,R119)

CAP VCC

D115

D117

DRUM VCC

12V

5.3VA 5V

3.3V

33V

12V REG BLOCK

(Q156,ZD103,C151,

R150,R153,C152)

8V REG BLOCK

(D114,IC151,R170,

C154,C159)

5V S/W BLOCK

(Q160,C155,D121,

R157,R158,R159,R160)

3.3V REG BLOCK

(IC152,C153,R156)

33V S/W BLOCK

(Q161,R154,R155,

R177)

5V S/W BLOCK

(Q163,C162,R173,

Q164)

PWR CTL'H'

SW5V

9V REG BLOCK

(Q165,ZD171,C171,

R174,R175,R176)

PWR CTL BLOCK

(Q162,C161,R164,

R163)

657 8

COMBI NTSC

3-22 3-23

2. TU/IF 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

999 GND

100AFT

732TU.V.OUT

875 MOD A.IN

61 MOD CTL

107 5V

26 VCR 'H'

971 MOD VEDIO

71 IIC CLK

72 IIC DATA

781 SIF OUT

COMBI NTSC

15833V

3-24 3-25

3. Y/C BLOCK DIAGRAM

73 6574

899190

IC301

HA118725

76 77

67 69

3640383733 34

57 45 43 42 46

EP CH1

EP CH2

V. OUT

(TO u-COM)

D-V SYNC

(FROM u-COM)

System

Y-CCD

C-CCD

CLOCK Drive

LPF

REC-AMP

SP CH2

REC-AMP

SP CH1

REC-AMP

EP CH2

REC-AMP

EP CH1

DATA

(FROM u-COM)

System

CLOCK

(FROM u-COM)

System

V.H/SW30

(FROM u-COM)

V.ENV

(TO u-COM)

System

SP CH1

SP CH2

Serial Cont

interface

X-tal

VCO/OSC

TRAP

629K

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

Main

De-Empf

DEMO

S LPF

2M LPF

ACC

CTL Trap

fh Trap

HIFI Trap

C LPF DEALY

MIX

AMP

6dB

AMP

C-

SQUELCH

SQUEL CH

CLEAR

SYNC

CLAMP

Sharpness

CONTROL

YNR NC

SYNC SEP

C-SYNC

(TO u-COM)

System

De-eMPH

VCA

C.K

LPF

BDBPF

CCD LPF

APC/ACC

DET

L- DET

Main

Conv2

Main

Conv1

FBC

Video ALC

(PB Mode)

++++

15 17 18 36 40 38 37 23 26 31 14 9 8 11

LINE 2 VIDEO IN

LINE 1 VIDEO IN

TV VIDEO IN

45 7365 74 6967

DVD VIDEO IN

ATT

-10dB VIDEO

AGC

CLEAR

SYNC

V. OUT

(TO u-COM)

D-V SYNC

(TO u-COM)

System

Y-CCD

C-CCD

CLOCK Drive

6dB

AMP

FBC

Video ALC

SQUEL CH

ATT

-10dB

C-SYNC

(TO u-COM)

ATT

-10dB

LPF

AGC DET

CLAMP

YNR

CLAMP

SYNC

SEP

D.E.

C-LPF 2

SPFACC

HPF

C-LPF 1

NL Emph

REC FILTER

LPF

VCA

629K

TRAP

FBC

ALC

Main

Conv2

Main

Conv2

APC/ACC

DET

Main

Emph

MOD

REC

Trap

REC-AMP

SP CH2

REC-AMP

SP CH1

REC-AMP

EP CH2

REC-AMP

EP CH1

MIX

ATT

B.E

C.K

CCD

LPF

L-DET

JCA

(-4dB)

f0=1.68M

f/0DEV

Adjst

X-tal

VCO/OSC

Serial Cont

interface

DATA

(FROM u-COM)

System

CLOCK

(FROM u-COM)

System

V.H/SW30

(FROM u-COM)

System

SP CH1

SP CH2

EP CH1

EP CH2

IC301

HA118725

COMBI NTSC

(REC Mode)

3-26 3-27

4. NORMAL AUDIO BLOCK DIAGRAM

IC301

HA118725NF

SIF

A_IN

RF_MOD

IC801

LA72670BM

TUNER

TU701

DET

NORMAL

AUDIO

OUT

LINE AUDIO(R) IN

LINE AUDIO(L) IN

REAR JACK

REAR Jack

A. OUT (L)

ALC

SIF

DE MOD

INPUT

SELECT

OUTPUT

SELECT

117312

A. OUT (R)

DVD AUDIO

(System)

IC801

LA72670BM

IC301

HA118725NF

AMP

410

A. OUT (R)

MOD. OUT

DATA

CLOCK

R/P HEAD

N.A.IN

ENA

55 54

From u-COM

A. OUT (L)

OUTPUT

SELECTOR

SIF

DE MOD

INPUT

SELECT

OUTPUT

SELECT

IC301

LA71206M

SIF

IC801

LA72670BM

TUNER

TU701

DET

NORMAL

AUDIO

OUT

LINE AUDIO(R) IN

LINE AUDIO(L) IN

REAR Jack

A. OUT (L)

REC

AMP

13 57

RF MOD.

A_IN

1 2

A. OUT (R)

COMBI NTSC

ALC

(EE Mode) (PB Mode) (REC Mode)

3-28 3-29

5. Hi-Fi BLOCK DIAGRAM

A B

Hi-Fi/

REC

IC801 LA72670BM

A.OUT

To JACK

MODULATOR

A.OUT (To T u)

Hi-Fi PB 'B'

Hi-Fi PB 'A'

Hi-Fi REC

12 74 11 73

6 4

26 27

A.OUT 'L'

A.OUT 'R'

AUDIO INPUT

BLOCK

NORMAL AUDIO

OUT(T o A VCP)

NORMAL AUDIO

IN(From AVCP)

SIF

DVD A.IN 'L'

DVD AUDIO

DVD A.IN 'R'

AV1 A.IN 'L'

AV1 A.IN 'R'

AV2 A.IN 'L'

AV2 A.IN 'R'

COMBI NTSC

REAR JACK

FRONT

FM MODU

DE MODU

DEMO

DULATE

INPUT

SELECT

OUTPUT

SELECT

3-30 3-31

6. SYSTEM BLOCK DIAGRAM

GND

MODE S1 MODE S2 MODE S3 MODE S4

MODE S/W

TO/FROM AVCP

T-UP REEL

T-UP END

SUP REEL

CST.SW/REC TAP

CS501

5.3VA

ES501

R550

LD501 DECK IR LED

R553

R555

RS501

RS502

R556

R558 C582

R538

R535

R537

R536

C534

R544

C552

R5C6

C500 C517

R541

R529

R583

L512

MS501

X502

14MHz

32.768KHz

OSC

X501

RESET

GND

Vcc

5.3VA

IC504

+ +

C592

C503

L501

R557

SUP END

ES502

C535

R564

R531

OSC

R/C

RC601

L511 R598 C595 C596

C561

TO/FROM DECK

Q503

Q501

CV IN

23 22

IC501

M37760

MODE S1

I-Limit

MODE S2 MODE S3

MODE S4

T-UP Sensor

T-UP Reel

SUP Reel

CST IN

Vss (AMP)

Vss (OSD)

Vss (SYSCON)

Vcc

(SYSCON)

Vcc

(SERVO)

CAP. PWM

CTL +

CTL -

CFG

CAP. REV 'H'

LD CTL

V. ENV

V.H.SW30

DPG

D.V.Sync

38 39

X out

Xc in Xc out

X in

OSC in 2

H.A.SW

SQPB

DRUM PWM

Vcc (OSD)

SUP Sensor

OSC out 2

Vcc (A/D)

TO/FROM AUDIO(Hi-Fi)

TO/FROM DVD

TO/ FROM TU/IF

100

26 61

VCR 'H'

MODU CTL

PLL DATA

PLL CLK

CV OUT

AFT

POWER FAIL

A. MUTE 'H'

A. ENV

A. H.SW

REC 'H'

71 72

CLK

DATA

COMP IN

REC 'H'

C.ROT

A.MUTE'H'

S clk

S in

S out

DVD DATA OUT

DVD DATA IN

DVD CLK

DVD RESET

DVD ENA

67 66 65

65 66 67 82 85

Hi-Fi ONLY

GND

Vcc

IC505

IC5F1

OSC

DISPLAY

COMBI NTSC

3-32 3-33

NOTES) Symbol denotes AC ground.

NOTES) Symbol denotes DC chassis ground.

NOTE) Warning

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

SR14370A

(DVW-7000 Without)

CIRCUIT DIAGRAMS

1. POWER(SMPS) CIRCUIT DIAGRAM 1

Switching Error. IC101 is defective.

Switching Error. IC103, 102 are defective.

2.5V, 3.3V no power. D111 is defective.

No Power. F101 is defective.

5.3VA no power. D112 is defective.

33V no power. D113 is defective.

No power. BD101, R101 are defective.

12VA no power. D110 is defective.

IMPORTANT SAFETY NOTICE

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

CUIT. SPECIAL COMPONENTS ARE SHADED ON THE SCHEMATIC FOR EASY IDENTIFICATION.

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

NOTE :

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

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

3-34 3-35

2. POWER(SMPS) CIRCUIT DIAGRAM 2

3-36 3-37

3. TU/IF CIRCUIT DIAGRAM

PB REC

3-38 3-39

4. A/V CIRCUIT DIAGRAM

WAVEFORM

Y. (REC) C. (REC) Y(PB)

Y/PB

C/PB

Y+C (PB)

C(PB)

Y+C (REC)

R333, C350, C349 are defective.

No Color.

H/SW Level is defective.

Video Noise.

L307,C349 are defective.

No Color.

C323 is defective.

Video output level unstable

R322, R323, R324, C320 are defective.

VIDEO Distortion

3-40 3-41

5. Hi-Fi CIRCUIT DIAGRAM

REC

23 Pin is defective. Hi-Fi Audio is not appear.

IC801 Pins37, 38 aredefective. All Audio is not appear.

3-42 3-43

6. JACK CIRCUIT DIAGRAM

3-44 3-45

7. SYSTEM CIRCUIT DIAGRAM

48 5 6

WAVEFORM

3854R14302B

Q501, Q503 are defective.

µ-COM is unstable.

IC505 is defective.

VCR will not operate.

X501 is defective.

CLOCK SETTING will not operate.

X502 is defective.

µ-COM will not operate.

ES501, ES502, LD501 are defective.

Auto Rew will not working.

RS501,RS502 are defective.

Auto stop occures.

R575, R576, R577, R578 are defective.

Deck will not operate.

3-46 3-47

8. TIMER CIRCUIT DIAGRAM

3-48 3-49

* IC501 Waveform

Tek Stop : 10.0 KS/s

280 Acqs

M5.00ms Ch1Ch1 3.04 V1.00 V

Tek Stop : 250KS/s

299 Acqs

M 200µs Ch1Ch1 3.04 V1.00 V

Tek Stop : 10.0KS/s

18 Acqs

M 5.00ms

Ch1

3.04 V

Trigger Position: 12%

1.00 V

Tek Stop : 10.0 KS/s

27 Acqs

M5.00ms Ch1Ch1 3.04 V1.00 V

Tek Stop : 10.0 KS/s

35 Acqs

M5.00ms Ch1

Ch1

3.04 V1.00 V

Tek Stop : 50.0 KS/s

120 Acqs

M1.00ms Ch1Ch1 3.04 V1.00 V

Tek Stop : 5.00KS/s

2 Acqs

M 10.00ms

Ch1

340V

Trigger Level: 340mv

500mV

IC501 Pin 18 REC/PB

IC501 Pin 13 QUE/REV

IC501 Pin 95 REC

IC501 Pin 87 REC/PB

IC501 Pin 90 REC/PB (DPG/DFG)

(DPG)

(DFG)

IC501 Pin 97 PB (CTL OUT)

IC501 Pin 94 REC

• WAVEFORMS

* IC301 Waveform

IC301 Pin 9 100mV/10msec DIV VV/EE (Main De-Emphasis out)

IC301 Pin 12 100mV/10msec DIV PB (Main De-Emphais

Peacking)

IC301 Pins 33, 36, 37 100mV/10msec DIV VV/EE Clamp Drive IN Pin 33 Y-out(to 1H CCD) Pin 36 Y-out(from 1H CCD) Pin 37

IC301 Pin 15 200mV/10msec DIV EE (VIDEO IN)

IC301 53 Pin 100mV/0.2msec DIV REC/PB (2fsc)

IC301 31 Pin

1.0V/20msec DIV VV/EE (C-SYNC OUT)

IC301 29 Pin 500mV/10msecDIV VV/EE (VIDEO OUT)

IC301 Pin 43 200mV/20msec DIV PB (C.OUT)

IC301 Pins 46, 57 200mV/20msec DIV VV/EE from 1H CCD Pin 46 to 1H CCD Pin 57

IC301 Pin 67 100mV/0.2msec DIV PB/REC (3.58MHz X-TAL IN)

IC301 Pin 77 100mV/5msec DIV PB (PB RF out)

IC301 Pin 86 500mV/2msec DIV SP REC (REC RF)

IC301 Pin 90 500mV/2msec DIV EP REC (REC RF)

3-50 3-51

• CIRCUIT VOLTAGE CHART

EE PLAY

MODE

PIN NO.

0.06

0.02

5.10

2.10

0.00

2.84

1.85

2.39

2.64

1.69

0.01

2.78

0.01

0.31

2.80

1.95

2.80

0.02

2.80

5.10

2.32

0.52

2.13

3.01

0.51

0.03

2.47

2.79

0.37

2.39

2.10

1.83

3.05

2.31

3.04

0.00

2.49

2.09

2.49

2.13

0.01

3.12

5.05

4.92

3.28

5.05

2.03

5.05

2.61

0.01

0.00

0.06

0.01

5.15

2.61

2.54

2.84

1.35

1.34

1.90

3.04

0.01

2.40

0.01

1.92

2.80

1.89

2.80

0.01

2.80

5.14

2.34

0.88

2.13

2.81

0.92

0.03

2.38

2.89

0.23

2.82

2.15

3.14

2.54

2.39

3.13

2.18

1.45

2.12

2.66

2.14

0.01

3.15

0.00

4.97

3.33

5.10

2.11

5.10

2.63

0.01

EE PLAY

MODE

PIN NO.

1.99

0.01

2.18

2.30

4.95

0.03

1.19

2.35

2.61

2.26

2.61

1.39

1.28

1.98

2.30

1.60

2.50

5.25

2.17

2.84

0.03

0.01

2.50

5.05

2.29

2.47

0.01

5.02

0.03

5.06

2.05

2.55

2.53

0.02

2.27

0.01

2.57

0.97

5.17

0.5

0.4

0.19

2.02

0.01

2.18

1.91

4.99

5.00

0.03

1.19

2.35

2.61

2.26

2.61

1.39

1.28

1.98

2.30

1.60

2.50

5.25

2.17

0.03

0.01

2.50

5.05

2.29

0.01

2.28

5.11

2.54

2.52

2.50

0.01

2.55

0.01

2.54

5.17

5.16

0.54

0.42

4.06

IC501

EE PLAY

MODE

PIN NO.

0.29

0.68

4.78

0.68

2.56

2.57

0.11

5.17

]5.17

5.17

5.13

5.15

1.52

1.43

5.15

2.19

2.28

0.51

0.26

2.35

2.41

1.29

1.88

0.53

1.88

4.96

2.03

2.6

1.96

2.57

3.91

0.99

3.42

4.78

2.57

0.43

2.57

0.11

5.17

5.13

5.17

5.13

5.15

1.51

1.44

5.15

2.18

2.27

0.55

2.34

2.41

1.99

0.57

1.98

4.95

2.03

1.92

2.05

2.58

4.28

EE PLAY

MODE

PIN NO.

0.97

2.38

5.07

4.7

5.02

4.75

5.17

4.94

5.03

2.69

0.58

0.17

0.54

0.1

2.53

2.54

0.21

2.5

2.52

5.08

5.17

2.64

5.19

5.14

5.19

4.7

2.56

9.21

2.48

5.19

1.91

0.29

0.86

5.07

4.45

4.97

4.61

5.17

1.79

2.72

4.76

4.94

4.98

2.67

0.68

2.36

1.36

2.54

2.53

2.49

2.52

5.08

5.17

1.95

5.19

5.14

5.19

4.7

2.54

9.18

2.48

5.19

2.07

1.31

IC504

IC505

IC801

EE PLAY

MODE

PIN NO.

2.5

1.91

2.49

5.06

2.51

2.52

2.51

0.19

2.25

2.24

2.25

2.48

2.51

5.02

2.64

5.06

5.17

0.19

2.52

2.51

2.52

5.06

2.49

1.9

2.05

1.22

3.86

9.2

6.26

1.96

2.2

4.56

2.52

3.86

3.15

4.02

3.83

2.45

2.5

2.44

2.49

5.05

2.51

0.86

2.44

2.45

2.43

2.42

3.66

2.3

0.11

1.34

3.79

5.01

2.65

2.64

5.05

5.17

2.57

2.45

2.43

2.45

0.25

5.05

2.49

2.42

2.06

0.25

9.19

0.28

0.29

2.15

2.35

0.23

0.24

EE PLAY

MODE

PIN NO.

3.87

4.09

3.88

3.94

3.86

2.5

3.87

3.17

4.42

4.4

0.32

0.31

2.5

0.4

0.22

4.3

IC301

100

EE PB EE PB

Base Emitter Collector

PB EE

Location

No.

Q301

Q302

Q303

Q304

Q305

Q306

Q307

Q309

Q501

Q503

Q504

Q505

Q506

Q507

Q805

Q701

Q702

0.25

4.4

0.01

4.7

-28

4.7

0.68

5.17

2.82

1.58

5.07

2.8

2.56

9.02

4.98

0.01

5.1

0.01

pulse

0 0

pulse

2.2

4.48

2.27

2.24

3.23

2.08

9.81

5.7

0.25

5.1

0.02

-28

-0.015

4.6

5.15

4.95

4.96

5.06

12.58

5.19

0.2

0.3

pulse

5.15

4.95

4.96

3.29

5.05

12.99

5.19

0.2

5.2

0.025

4.4

0.7

0.025

1.5

0.68

5.17

2.94

1.58

2.6

2.56

9.24

4.97

-0.01

5.1

4.7

-24

5.1

4.48

2.18

1.03

2.08

9.82

5.7

3-52 3-53

PRINTED CIRCUIT DIAGRAMS

1. MAIN P.C.BOARD

LOCATION GUIDE

2. MAIN P.C.BOARD

LOCATION GUIDE

3-54 3-55

3-56 3-57

3. POWER P.C.BOARD

LOCATION GUIDE

NOTES) Warning

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

3-58

ELECTRICAL TROUBLESHOOTING GUIDE

1. System operation flow

Power On

Yes

Show LOGO

Tray Closed?

Tray Close to Closed position

SLED Moves to Inner Position

Recieve

OPEN/ CLOSE

Key?

Receive

CLOSE Key?

1. Stop Playback & Open Tray

2. Display tray open message & LOGO

1. Execute Pressed Key & IR Key

2. Systemoperati on Routi ne Loop

1. Judge whether have disc and disc type

2. Jump to related disc reading procedure

SLED at Inner

Side?

1. 8032 initializes SERVO, DSP & RISC registers

2. Write RISC code to SDRAM

3. Reset RISC

DVD PART

3-59

2. Test & debug flow

TEST

Check the POWER PART

Yes

Check the POWER PART

Check the regulators or diode(D111).

1. Check 27MHz system clock.

2. Check systemreset circuit.

3. Check FLASH R/Wenable signal PRD, RWR.

4. Check RS232 SIGNALS.

5. Check FLASH Memory related circui t.

Check the

AC Voltage

Power PCBA (110V

or 220V)

Switch on the Power PCBA

the DC Vol tage

outputs OK?

(5V, 3.3V, 8V, 12V)

Is 3.3V and 2.5V DC

outputs normal on main

PCBA?

Update

FLASH(IC6A1)

successfully?

Replace FLASH( IC6A1)

Connect to PC RS232 Cable and update the FLASH memory code.

Make sure the main PCBA don't

3-60

RESET or Power On.

Show LOGO?

Flash

Memory operates

properly?

Check connecti on lines between FLASH & MT1379 and the FLASH access time whether is suitable or not.

SDRAM

works properl y?

MT1379

VIDEO outputs

properly?

Have

TV signal output?

Check AV cable connection to TV set .

Check the load OPEN & CLOSE switch

Check the Tray control IO pins on MT1376 & MT1379.

Check the Tray control amplifying circuit on Motor driver.(IC202)

Does

Tray move inside

when it is not at closed position?

Normal

TROUT & TRIN

signals?

Normal

TRCLOSE &

TROPEN signal?

Normal

LOAD+ & LOAD-

signal ?

Check the cable connection between main PCBA and loader. (MECHA)

Check connection lines between SDRAM(IC602,IC603) & MT1379 and the SDRAM is damaged.

Check the related circui t of MT1379. (IC601 PIN 161,166, 168 check)

Check the filteri ng and amp circuit of TV signal.

3-61

YesYes

Yes

Does

the SLED move

to inner side when it is at

outter position?

Motor Driver STBY

Pin is High?

Motor Driver STBY

Pin is High?

SL+ and SL- output

properl y?

Optical

Lens has movements

for searching

Focus?

Proper F+

& F- outputs?

Check cable connect on with pick-up head.

Proper FOSO outputs

to motor driver?

Check FOSO connection on MT1379 and motor driver.

Check the amp circuit on motor driver.

Check the cable connection with MECHA.

Do not put in disc and tray close.

Check the connection line of STBY signal .

Check the rel ated circuit of FMSO.

Check the amp circuit on motor driver.

3-62

Yes

Laser turns on when

reading disc?

LD01 or LD02 output

properly?

MT1336 (IC201)

Check therel ated ci rcuit on laser power transi stor

Check the related circuit on MT1336 RFL signal .

Collector voltage of power transistor is OK?

( Q204, Q205)

Check cable connection between transistor couput and pick-up head.

Laser off

Proper RFL signal

on MT1336?

Proper

DMSO signal on

MT1379

Check DMSO related circuit on MT1379.

Check the spindle control amp circuit of motor driver.

SP+ & SP- output

properly?

Check the cable connection between spindle and main PCBA.

Check the RFL connection between MT1336 and MT1379.

Put disc in?

Disc ID is correct?

Does spindle rotate?

3-63

Yes

No No

Yes

Focus ON OK?

Track On OK?

Disc is play?

Proper

signals on A, B, C,

D of MT1336

Check connections between MT1336 and pick-up head.

Proper FEO signal

on MT1336?

Proper FEO signal

on MT1336?

Check the related circuit on MT1336 FEO sugnal .

Check the related circuit on MT1336

Properly TRSO signal

on MT1379?

T+ & T- output

properly?

Check the TRSO connection on MT1379 and motor dirver.

Check the tracking control amp circuit on motor driver.

Check cable connection on pick-up head.

Check RF signal waveform.

Check FEO connection between MT1336 and MT1379

3-64

Normal

Audio output

when disc playback?

TEST END

Audio

DAC received

correct data stream?

Normal

Audio DAC

out? (IC401)

Check Audio filter, amplify, mute circuit. (IC402 Application circuit)?

Check connection between MT1379 & Audio DAC. (Check VRST#, ACLK, ABCK, ASDAT3)

Check the related circuit of Audio DAC. (Check Audio out Pin 14, 15,18,19)

3-65

DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING

1. SYSTEM 27MHz CLOCK,RESET,FLASH R/W SIGNAL

1) MT1379 main clock is at 27MHz(X501)

3.8V, 27MHz

FIG 1-1

2) MT1379 & MT1336 reset is high active.

PWR_CTL(CN505 PIN 7)

5.2VA

Power Cord in

M_RESET(CN505 PIN 9)

URST(IC501 PIN 188)

FIG 1-2

3-66

3) RS232 waveform during procedure(Downloading)

TXD(J6 PIN3)

RXD(J6 PIN 2)

FIG 1-3

4) Flash R/W enable signal during download(Downloading)

FRD(IC5A1 PIN 28)

FWR(IC5A1 PIN 11)

FIG 1-4

3-67

2. SDRAM CLOCK

1) MT1379 main clock is at 27MHz(X501)

(IC502,IC503 PIN 35)

DCLK = 93MHz, Vp-p=2.2, Vmax=2.7V

FIG 2-1

3. TRAY OPEN/CLOSE SIGNAL

1) Tray open/close waveform

OPEN((CN203 PIN 3)

CLOSE(CN203 PIN 2)

TROPEN(IC202 PIN 1)

TRCLOSE(IC202 PIN 2)

FIG 3-1

3-68

2) Tray close waveform

OPEN((CN203 PIN 3)

CLOSE(CN203 PIN 2)

TROPEN(IC202 PIN 1)

TRCLOSE(IC202 PIN 2)

FIG 3-2

3) Tray open waveform

OPEN((CN203 PIN 3)

CLOSE(CN203 PIN 2)

TROPEN(IC202 PIN 1)

TRCLOSE(IC202 PIN 2)

FIG 3-3

3-69

4. SLED CONTROL RELATED SIGNAL (NO DISC CONDITION)

FMSO(2.0V/1.4V/1.0V) (IC501 PIN 19)

STBY(5V) – (IC201 PIN 50)

SL+(4.7V/3.6V/1.9V) (IC202 PIN 12)

SL-(5.3V/3.7V/2.5V) (IC202 PIN 13)

FIG 4-1

5. LENS CONTROL RELATED SIGNAL(NO DISC CONDITION)

FOSO(1.5V/1.4V/1.3V) (IC501 PIN 12)

F+(4.0V/3.6V/3.2V) (IC202 PIN 9)

F-(4.0V/3.6V/3.2V) (IC202 PIN 8)

FIG 5-1

3-70

6. LASER POWER CONTROL RELATED SIGNAL(NO DISC CONDITION)

MDI1(0V/180mV) (IC201 PIN 124)

LD01(5.0V//3.5V) IC201 PIN 125)

LD02(5.0V/3.6V) (IC201 PIN 126)

FIG 6-1

7. DISC TYPE JUDGEMENT WAVEFORM

F+(IC202 PIN 9)

FE(IC201 PIN 18)

RFL(IC201 PIN 19)

FIG 7-1 (DVD)

3-71

F+(IC202 PIN 9)

FE(IC201 PIN 18)

RFL(IC201 PIN 19)

FIG 7-2 (DVD)

F+(IC202 PIN 9)

FE(IC201 PIN 18)

RFL(IC201 PIN 19)

FIG 7-3 (CD)

3-72

F+(IC202 PIN 9)

FE(IC201 PIN 18)

RFL(IC201 PIN 19)

FIG 7-4 (CD)

8. FOCUS ON WAVEFORM

FE(IC201 PIN 18)

FOSO(IC501 PIN12)

F+(IC202 PIN 9)

F-(IC202 PIN 8)

FIG 8-1 (DVD)

3-73

FE(IC201 PIN 18)

FOSO(IC501 PIN12)

F+(IC202 PIN 9)

F-(IC202 PIN 8)

FIG 8-2 (CD)

9. SPINDLE CONTROL WAVEFORM (NO DISC CONDITION)

DMSO(1.4V/1.8V) (IC501 PIN 18)

SP-(3.6V/2.4V) (IC202 PIN 10)

SP+(3.6V/4.8V) (IC202 PIN 11)

FIG 9-1

3-74

10. TRACKING CONTROL RELATED SIGNAL(System checking)

TE(IC201 PIN 21)

TRSO(IC501 PIN 13)

T-(IC202 PIN 7)

T+(IC202 PIN 6)

FIG 10-1(DVD)

TE(IC201 PIN 21)

TRSO(IC501 PIN 13)

T-(IC202 PIN 7)

T+(IC202 PIN 6)

FIG 10-2(CD)

3-75

11. RF WAVEFORM

RFOP(2.3V/1.1V) (IC201 PIN 6)

RFON(0.8V/2.0V) (IC201 PIN 7)

FIG 11-1

12. MT1379 AUDIO OPTICAL AND COAXIAL OUTPUT (ASPDIF)

(IC501 PIN 153)

FIG 12-1

3-76

13. MT1379 VIDEO OUTPUT WAVEFORM

1) Full colorbar signal(CVBS)

(IC604 PIN 23)

FIG 13-1

2) Y

(IC604 PIN 21)

FIG 13-2

3-77

3) C

(IC604 PIN 26)

FIG 13-3

14. AUDIO OUTPUT FROM AUDIO DAC

1) Audio L/R

FIG 14-1

(JK601 PIN 4,5)

3-78

2) Audio related Signal

ASDAT3(IC501 PIN 157)

ABCK(IC501 PIN 148)

ALRCK(IC501 PIN 149)

ASDATA3

FIG 14-2

3-79

BLOCK DIAGRAMS

1. Overall Block Diagram

DISC

SPINDLE

MOTOR

DECK MECHANISM

DVD:RF0,A,B,C,D

CD:RF0,A,B,C,D,E,F

PICK

KEY Input

B/Pb

IC6A1

29LV800TA-70

8BIT

FLASH ROM

URST

A[00:19]

PCE#

PRD#

PWR#

DQ[00:15]

RFON,RFOP,FEO,RFL,CSO

TEO,BDO,RFRP,HTRC,V2P8

L/R

CVBS

R/Pr G/Y

Y[1:6]

L/R

AC 90V~240V

50HZ/60Hz

STBY,TRCLOSE

27MHz

X-TAL

PWRCTL

IC604

KS24C021CS

EEPROM

IC401

CS4392(2DAC)

IC401

NJM4580

OP-AMP

RC901

REMOCON

RECEIVER

IC903

RESET IC

LOAD+,LOAD-

F+,F-,T+,T-

SP+,SP-

IC201

MT1336E

SLED

(FEEDING)

MOTOR

SL+,SL-

IC202

LA6560

MOTOR

DRIVER

V33

DV33

AV33/DV33/V25

VCC/DV33/3V3M

ACLK

ABCLK

ALRCK

IC6A2

MM1623XFBE

VIDEO BUFFER

MIC_DETC

ASPDIF

COAX OPTICAL

ASPECT

LD01,LD02, IOA, V2.0

VCC/+8V

RVCC

LIMIT

TROUT,TRIN

TROPEN,TRSO,FOSO,DMSO,FMSO

°‹

SCLK,SDEN,SDATA

PWMOUT2

AD[0:7]

VCC

VCR

VFD_SCK

VFD_TXD

M_REQ

POWER

BOARD

V1P4

MDI1

APC

VFD_RXD

S_REQ

MUTE

J601

RS232

TXD

RXD

SCL

IC602

M12L16161A

512K

2Banks

16BIT

SDRAM

SD33

IC603

M12L16161A

512K

2Banks

16BIT

SDRAM

SD33

MA[00:10]

BA0

DCLK

DCKE

CS#

RAS#

CAS#

WE#

DQM[0:1]

DQ[16:31]

SDA

VRST#

ASDAT[0:3]

VSCK

VSDA

ASTB

IC601

MT1379E

DSP/MPEG

+12VVCC

DV33

IC606

BUFFER IC

74HCT244

VCC

ADIN

COMBI SCART

V8806/VC8806P1K'S

3-80

IC202

LA6560

Motor Driver

DVD: A,B,C,D, RFO

CD: A,B,C,D, E, F,RFO

SP+, SP-

M/D

PICK

X601

IC601

MT1379

DVDPLAYER

COMBO

CHIP

IC201

MT1336E

RF Signal

Processor

FOSO,TRSO,FMSO

DMSO,,TROPEN

FEO,TEO,RFL,RFRP

BDO,CSO,HTRC,V2P8

ADIN

F+, F-, T+, T-

SL+, SL-

LOAD+, LOAD-

27MHz

X-TAL

RFOP,RFON

LD0 1, LDO 2, IOA

MDI 1

ALPC

V20

SDEN, SDATA,

SCLK,PWMOUT2

LIMIT,TRIN,TROUT

TRCLOSE

STBY,V1P4

IC602

GM72V161621

1M x 16bit

SDRAM

IC603

GM72V161621

1M x 16bit

SDRAM

MA[0:10]

DQM0 ,DQM1

WE#,CAS#,RAS#

CS#,BA0,

DCLK

DCKE

DQ[0:15]

DQ[16:31]

MA[0:10]

DQM0 ,DQM1

WE#,CAS#,RAS#

CS#,BA0,

DCLK

DCKE

FLASH

ROM

PRD#, PWR#

PCE#

AD[0:7]

A[0:19]

EEP

ROM

SCL, SDA

RS232C(MTK)

RXD, TXD

COMBI SCART

V8806/VC8806P1K'S

2. SERVO Block Diagram

3-81

3. MPEG & MEMORY Block Diagram

IC603

SDRAM

16M

IC604

EEPROM

IIC601 (MPEG + DSP )

MT1379

IC6A1

FLASH MEMORY

(8 M )

IC606

(74HCT244)

Voltage level shift

VIDEO

Interface

AUDIO

Interface

RF IC

Interface

FRONT MICOM

Interface

(FRONT BOA R D)

IC602

SDRAM

16M

RFOP,RFON,HTRC,RFRP,RFL

DCLK,WE,CAS,RAS

CS,DCKE,MA[0:10]

DQM0,DQM1

DQ[0:15]

DQM2,DQM3

DQ[16:31]

X601

27MHz

SCL,SDA

Y2(Y),Y3(Color)

Y4(Y),Y5(Cb),Y6(Cr)

ASPECT(16:9)

FEO,CSO,TEO,ADIN,BDO

SDATA,SDEN,SCLK,URST

FMSO,DMSO

V1P4,V2P8

TROPEN,TRSO,FOSO

ACLK,ALRCK,ABCK

MUTE,VSCK,VSDA

ASDTA[0:3]

ASTB,SCL,SDA

ASPDIF

PWR,PCE,PRD

A[0:19]

AD[0:7]

VFD_SCK

VFD_TXD

M_REQ

SCKO,TXDO,M-REQ

URST,S_REQ

VFD_RXD

COMBI SCART

V8806/VC8806P1K'S

3-82

4. VIDEO & AUDIO Block Diagram

IC6A2

VIDEO 6dB

Amp

IC401

AUDIO DAC

(2CH)

IC402

(OP Amp)

LPF&Buffer

CVBS

COMPONENT (R.G.B) / (Y.Pb.Pr )

SUPER VIDEO (Y/C)

(R.G.B) / (Y.Pb.Pr )

(Y/C)

DAC RESET

ACLK

SCL

SDA

TO JACK

MPEG

AUDIO ‘R’

ADATA3

COMBI SCART

V8806/VC8806P1K'S

3-83 3-84

Video signal Y

Video signal Color

Digitron all not display System not working

Program download fail

System not working or screen is abnormal

Video signal not appeared

No Power on

CIRCUIT DIAGRAMS

1. SYSTEM CIRCUIT DIAGRAM

3-85 3-86

2. RF & DSP SERVO CIRCUIT DIAGRAM

CD/DVD LD will not on

3-87 3-88

3. AV/JACK CIRCUIT DIAGRAM

• CIRCUIT VOLTAGE CHART

3-89 3-90

PIN STOP PLAY STOP PLAY STOP PLAY STOP PLAY STOP PLAY STOP PLAY

1 1.03 2.99 0 0 1.22 1.22 3.27 3.28 0 0 0 0 2 5.11 5.08 0 0 0 0 1.18 1.26 0 0 2.59 2.55 3 0 0 8.04 8.01 0.96 0.9 1.1 1.52 0 0 0 0 4 0 0 0.12 0.06 2 2.06 0 0 0 0 2.59 2.56 5 5.11 5.07 0 0.06 0 1.51 0.66 1.07 3.28 3.29 0 0 6 0 1.95 3.64 3.69 1.48 1.47 0.85 1.12 3.28 3.29 3.24 3.23 7 0 0 3.62 3.61 0 1.56 3.27 3.28 0 0 0 0 8 0 0 3.64 3.53 3.2 1.52 0.51 0.97 3.28 3.29 0.14 0.08

9 5.11 0 3.6 3.76 0.12 0.06 3.06 0 0 0 10 5.11 5.08 3.62 2.43 0.12 0.06 0 0 0 0 11 5.11 5.08 3.63 4.85 3.25 3.25 0.06 0.98 0.15 0.09 12 0 0 3.62 3.72 1.41 1.49 3.18 0.87 0 0 13 5.11 0 3.64 3.57 1.41 1.41 3.27 3.28 0.15 0.08 14 5.11 5.08 8.04 8.01 0 0 2.94 2.56 5.19 5.19 15 2.84 2.81 1.45 1.48 1.42 1.42 0.47 0.42 0.14 0.09 16 1.45 1.43 0.27 1.39 3.3 0 2.93 3.01 5.25 5.24 17 2.08 2.07 0.29 1.32 2.53 2.53 3.21 3.22 0.15 0.08 18 1.37 1.42 1.45 1.43 1.42 2.27 2.87 2.95 5.23 5.23 19 0.69 2.3 1.45 1.43 1.42 1.39 0.15 1.32 0 0 20 2.4 0 1.45 0.82 0 0 0 0.05 5.25 5.25 21 2.35 0 1.45 1.43 2.61 2.58 3.09 1.32 22 5.11 5.08 1.45 1.43 0.75 1.46 3.09 1.32 23 0 0 1.47 1.37 2.83 1 3.09 1.32 24 2.59 3.2 1.45 1.43 1.9 0.89 3.09 1.33 25 0.19 1.88 1.45 1.43 1.72 0.39 3.27 3.29 26 1.58 0 0.95 0.91 0.68 0.31 0 0 27 2.56 3.13 0 0 2.84 3.16 0.15 1.36 28 2 2.01 1.45 1.43 0 0 1.84 2.36 29 2 2.06 5.15 5.11 2.85 0.66 1 2.32 30 2.96 1.52 1.45 1.43 1.83 0.49 0.54 1.75 31 0 0 1.45 1.43 0.91 1.39 0.06 0.06 32 0.06 2.07 1.45 1.43 1.43 1.2 0.05 0.06 33 0.07 2.07 1.46 1.45 1.51 1.57 0 0 34 0 0 5.08 5.06 1.51 1.43 0.73 1.26 35 0 0 5.15 5.11 3.3 3.29 1.48 1.55 36 0 0 0 0 0.81 1.26 2.91 2.53 37 5.13 0 1.45 1.02 0.07 0 38 0 0 1.82 1.6 3.27 3.28 39 0 0 1.2 1.5 1.06 1.05 40 0 0 2 2.06 0.47 0.98 41 0 0 2.17 1.95 0 0 42 5.12 5.09 2.53 2.52 0 0.6 43 5.12 5.09 1.96 1.9 1.12 1.24 44 5.12 5.09 1.79 1.9 3.27 3.28 45 5.12 5.09 0.8 1.72 1.21 0.99 46 5.12 5.09 0.8 1.96 1.31 1.34 47 0 0 0.8 1.84 0 0 48 5.12 5.09 3.3 2.63 1.43 1.44 49 5.12 0 0 0.13 0.88 1.01 50 5.08 5.06 0 0.07 0 0 51 5.09 5.07 0 0 52 5.1 0 0 0 53 0 0 0 0 54 5.13 0 0 0 55 0.09 0.2 3.25 3.27 56 1.61 0 1.21 1.18 57 0 0 0 0 58 0 0 3.29 3.29 59 0 0 0 0 60 0 0 0 0 61 3.28 0 2.59 2.57 62 0 0 2.58 2.58 63 0 0 0 0 64 0 0 2.59 2.56 65 0 0 3.29 3.29 66 0.26 0 3.3 3.29 67 5.12 5.08 3.29 3.29 68 0 0 2.57 2.56 69 5.12 0 5.19 5.18 70 3.21 2.03 2.59 2.57 71 3.46 2.2 0.12 0.08 72 2.81 0 2.53 2.52 73 0 0 2.59 2.57 74 0.21 0.09 3.29 3.29 75 0.22 0 2.61 2.61 76 0 0.1 3.27 3.24 77 0.21 0.09 0 0 78 0.23 0.09 0.94 1.04 79 0.21 0.08 0.78 1.06 80 0.23 0.08 0.89 1.15

STOP PLAY STOP PLAY STOP PLAY STOP PLAY

0.08 0.16 3.28 3.29 5.52 5.49 5.09 5.08

1.82 0.45 3.28 3.28 5.52 5.48 2.43 2.42

2.84 0 0 1.65 5.51 5.47 5.09 5.08

2.83 3.12 1.63 1.64 0 0 1.45 0

0.69 0.26 1.64 1.65 5.51 5.48 0 0

1.72 0.25 1.59 1.61 5.51 5.48 1.45 1.69

1.92 0.9 0 0 5.52 5.47 0 0

1.7 1.45 3.28 0 12.03 12.03 2.47 2.46 0 0 3.28 3.29 0 0 0 0 0 0 1.14 1.76

3.27 3.29 5.01 5.01 0 0

3.56 3.55 2.31 2.31 2.42 2.42

3.29 3.29 4.96 0 5.09 5.08 0 0 1.42 2.41 2.43 2.42

0.23 0.06 2.4 2.39 0 0 0 0 0 0 2.49 2.47 0 0 5.11 5.09 0 0 0 0.87 2.41 2.41 2.48 2.47

1.98 2.64 2.43 2.43 0 0

2.28 2.18 0 0 1.18 2.3

2.13 1.96 1.76 2.17

1.67 2.01 0 0

1.99 1.72 1.76 2.24

1.93 2.19 0 0

2.05 1.94 0 0 00 00 0 0 0.06 0.05 0 0 5.09 0

1.49 2.03

0.16 1.07

1.96 1.25

0.16 1.1

0.99 2.2

1.17 1.07

0.79 1.82

0.15 1.07

3.29 3.3

1.93 3.09

0.16 1.07

1.5 2.2

0.16 1.07

1.21 2.64

0.16 1.08

1.64 1.48

2.05 2.06 00 00

0.07 0.13

IC201

(MT1336E)

IC202

(MOTOR)

IC501

(MT1379)

IC502

(SDRAM)

IC505

(EEPROM)

IC510

(BUFFER)

IC5A1

(FLASH)

IC401

(CS4391)

IC402

(AMP)

IC5C1

(MM1623XFBE)

PIN STOP PLAY STOP PLAY STOP PLAY STOP PLAY STOP PLAY STOP PLAY

81 0.22 0 0.99 1.34 82 0 0 2.52 2.52 83 0 0 3.09 1.33 84 0.07 0 0.37 1.16 85 0.07 2.27 3.08 1.1 86 1.97 0 3.07 1.08 87 1.96 1.9 0.59 1.04 88 1.54 1.71 1.57 2.53 89 0.19 2.22 3.2 3.13 90 0.21 0 2.77 2.53 91 0.22 0.06 0.22 1.68 92 0.22 0 0 0 93 0.23 0.06 3.32 1 94 0.23 0.06 0.16 1.58 95 2.28 0 3.31 1.62 96 2.28 2.25 3.3 1.08 97 2.27 1.23 3.3 3.29 98 2.27 2.23 3.32 1.62

99 2.27 2.23 0.16 1.09 100 2.26 2.23 3.32 1.27 101 2.08 2.17 3.3 1.32 102 2.07 2.17 0 0 103 2.07 2.18 1.56 1.55 104 2.08 0 0.94 1.25 105 0.14 0.15 0.41 0 106 0.14 0.16 0.05 0.06 107 0 0 0 0.06 108 1.28 1.28 3.27 3.26 109 5.18 5.05 0 0 110 0.14 0.16 0.19 1.74 111 0.15 0.15 3.3 3.29 112 0.13 0.16 0.18 1.62 113 0.14 0.15 2.98 2.38 114 5.1 5.05 3.02 1.48 115 2.07 2.09 0 0 116 2.06 2.09 2.86 3.01 117 0 0 2.86 2.54 118 0 0 0 0 119 0 0 0 2.5 120 5.1 5.05 2.55 2.51 121 0.13 0.15 3.03 1.4 122 0.14 0.15 3.03 1.4 123 0 0.18 0.22 1.39 124 0 0.18 0.22 0.34 125 5.08 5.03 0 0 126 5.08 3.16 3.31 0.98 127 0.06 2.08 0.26 1.64 128 0 0 3.31 1.53 129 3.3 1.15 130 3.3 3.29 131 3.31 1.49 132 0.16 0.89 133 3.3 0 134 3.3 1.07 135 0 0 136 2.86 2.53 137 2.86 2.53 138 0.07 0.86 139 0.09 0.99 140 0.07 2.51 141 0.07 0.94 142 0.09 1.13 143 0.07 1.19 144 0.09 1.07 145 0.09 0 146 0 1.51 147 0.09 1.25 148 0.07 1.64 149 0.06 0 150 0 1.65 151 0.07 3.29 152 0 1.6 153 0 1.64 154 0 1.44 155 0 0 156 0 0 157 0 1.63 158 0 3.29 159 0 3.27 160 0 1.27

STOP PLAY STOP PLAY STOP PLAY STOP PLAY

IC201

(MT1336E)

IC202

(MOTOR)

IC501

(MT1379)

IC502

(SDRAM)

IC505

(EEPROM)

IC510

(BUFFER)

IC5A1

(FLASH)

IC401

(CS4391)

IC402

(AMP)

IC5C1

(MM1623XFBE)

3-91 3-92

PIN STOP PLAY STOP PLAY STOP PLAY STOP PLAY STOP PLAY STOP PLAY

161 0 1.27 162 0 2.35 163 0 0 164 0 0.73 165 0 3.27 166 0 0.5 167 0 0 168 0 0.53 169 0 3.27 170 0 0.59 171 0 0 172 3.01 0.72 173 0 0.72 174 0 0 175 0 2.73 176 0 3.13 177 0 3.13 178 0 3.25 179 0 0 180 0 0 181 2.04 2.64 182 0 2.52 183 0 0 184 0 0.09 185 0 3.26 186 - 187 0 0.08 188 0 0 189 0 0 190 0 0 191 0.23 0 192 0 3.29 193 0 0 194 0 0 195 0 0 196 0 0 197 0 1.63 198 0 0 199 0 0 200 0 2.15 201 0 1.44 202 0 1.44 203 0 1.43 204 0 1.43 205 0 1.42 206 0 2.1 207 0 2.07 208 0 1.41 209 0 1.52 210 0 1.43

211 0 2.81 212 0 3.28 213 0 0.12 214 0 0.12 215 1.02 1.43 216 0 1.43

STOP PLAY STOP PLAY STOP PLAY STOP PLAY

IC201

(MT1336E)

IC202

(MOTOR)

IC501

(MT1379)

IC502

(SDRAM)

IC505

(EEPROM)

IC510

(BUFFER)

IC5A1

(FLASH)

IC401

(CS4391)

IC402

(AMP)

IC5C1

(MM1623XFBE)

Q201 Q202 Q203 Q204

STOP PLAY STOP PLAY STOP PLAY STOP PLAY

E 0 0 0 0 0 0 5.14 4.34 C 0 5.09 0 0 0 0.19 0 2.42 B 0.68 0 0 5.04 5.04 0 5.08 3.64

Q205 Q501 Q6401

STOP PLAY STOP PLAY STOP PLAY

E 5.14 5.10 0 5.17 0 C 0.5 0 0 0 0 0.13 B 5.08 5.05 0.83 0.83 5.11 0

POSITION DRAWING OF DECK MECHANISM PARTS

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

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

DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM

01.Assembly and disassembly of Drum.........4-2

02.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. Check of Mechanism Assembly Mode ....4-13

2. Previous Preparation for

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

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

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

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

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

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

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

5-2. Check of Tape Path 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 of 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

MAINTENANCE AND CHECK OF VIDEO FUNCTION

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

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

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

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

5. Maintenance Course ...............................4-20

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

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

GUIDE FOR TROUBLESHOOTING

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

POSITION DRAWING OF DECK MECHANISM PARTS

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

Parts firstly Disassembled

Order Of Dis-

assembled

Part Fixing Type

Ref.

Draw-

ings

Posi

tion

NOTE : Assembly order is a reverse of

disassembly order.

(1) For assembly, check the assembly mode is accurate. (2) Parts firstly disassembled indicate parts firstly disassem-

bled in disassembly of related parts.

T:Top, B:Bottom

33 14

8 12 18

16 17

13 15

4-2

DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM

Cap, FPC

Drum Assembly

Cable Flat

(S1)

Holder FPC

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

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

Motor.

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

and separate the drum assembly.

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

FPC and the Cap FPC (disassemble if necessary).

Fig. A-1

Cautions in assembly of FPC

Holder FPC

Drum FPC

Cap FPC

Assembly shape seen in the reverse direction

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)

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)

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)

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)

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)

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)

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

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)

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)

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

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

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

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

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

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)

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.

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:

Zenith GBV441 Schematic

Specifications and Main Features

Frequently Asked Questions

User Manual