Zenith XBS344, DT-66550M Service Manual

1

SERVICE MANUAL

Product Type: Combo Home Theater System Chassis: D35 (DECK), DP-7C (MD) Manual Series: XBS344(DT-66550M) Manual Part #: 3829RGN002Q Model Line: F Product Year: 2003

Summary 1 Cabinet & Main Chassis 2 Electrical 3 VCR Mechanism 4 DVD Mechanism 5 Parts List 6

Published August 2003

by Technical Publications

Zenith Electronics Corporation

201 James Record Road

Huntsville, Alabama 35824-1513

Model Series:

CONTENTS

XBS344 (DT-66550M)

....................................................

.............................

.....................................................

........................................

....................................................

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 ............. 1-2

SERVICING PRECAUTIONS .................................................................................................. 1-3

• General Servicing Precautions

• Insulation Checking Prodedure

• Electrostatically Sensitive Devices

SPECIFICATIONS ...................................................................................................................... 1-4

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.

A.C. Voltmeter

1500 OHM

10 WATT

Place this probe on each exposed metal part.

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

0.15uF

PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS

1-4

SERVICING PRECAUTIONS

CAUTION: Before servicing the COMBO HOME THEATER SYSTEM covered by this service data and its supplements and addends, read and follow the

SAFETY PRECAUTIONS.

NOTE:

if unforeseen circumstances create conflict between the following servicing precautions and any of the safety precautions in this publications, always follow the safety precautions.

Remember Safety First:

General Servicing Precautions

1. Always unplug the COMBO HOME THEATER SYSTEM

AC power cord from the AC power source before: (1) Removing or reinstalling any component, circuit board,

module, or any other assembly.

(2) Disconnecting or reconnecting any internal electrical

plug or other electrical connection.

(3) Connecting a test substitute in parallel with an elec-

trolytic capacitor. Caution: A wrong part substitution or incorrect polarity installation of electrolytic capacitors may result in an explosion hazard.

2. Do not spray chemicals on or near this COMBO HOME

THEATER SYSTEM 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 COMBO HOME THEATER

SYSTEM and/or any of its electrical assemblies unless all solid-state device heat sinks are correctly installed.

6. Always connect the test instrument ground lead to an

appropriate ground before connecting the test instrument positive lead. Always remove the test instrument ground lead last.

Insulation Checking Procedure

Disconnect the attachment plug from the AC outlet and turn the power on. Connect an insulation resistance meter (500V) to the blades of the attachment plug. The insulation resistance between each blade of the attachment plug and accessible conductive parts (Note 1) should be more than 1Mohm. Note 1: Accessible Conductive Parts include Metal panels, Input terminals, Earphone jacks,etc.

Electrostatically Sensitive (ES) Devices

Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some field effect transistors and semiconductor chip components. The following techniques should be used to help reduce the incidence of component damage caused by static electricity.

1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off any electrostatic charge on your body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging wrist strap device, which should be removed for potential shock reasons prior to applying power to the unit under test.

2. After removing an electrical assembly equipped with ES devices, place the assembly on a conductive surface such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly.

3. Use only a grounded-tip soldering iron to solder or unsolder ES devices.

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

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

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

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

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

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

1-5

SPECIFICATIONS

GENERAL

Power requirements AC 120V, 60 Hz Power consumption 74 Dimensions (approx.) 430 X 97.5 X 360 mm (w x h x d)

(16.9 x 3.9 x 14.2 inches) Mass (approx.) 7 kg (15.4 lbs) Operating temperature 5°C to 35°C (41°F to 95°F) Operating humidity 5 % to 90 % Signal system NTSC

INPUTS

ANTENNA IN Antenna or CATV input, 75 ohms VCR VIDEO IN 1 Vp-p 75 ohms, sync negative,

RCA jack x 1 VCR AUDIO IN -6.0 dBm more than 47 kohms,

RCA jack (L, R) x 1 FM ANTENNA IN FM antenna input, 300 ohms AM ANTENNA IN AM antenna input, 300 ohms DIGITAL AUDIO IN 5 V (p-p), 75 Ω,

Optical connector x 1

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 (analog audio) 1.1 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, EP: 11.12 mm/sec Tape width 12.7 mm Maximum recording time SP: 2 HOURS (T-120), EP: 6

HOURS (T-120)/8 HOURS (T-160) Rewind time About 150 seconds (T-120) Antenna 75 ohms (VHF/UHF)

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 85 dB

(AUDIO OUT jacks) Channel separation More than 55 dB

(AUDIO OUT jacks)

DVD SPECIFICATIONS

Laser system Semiconductor laser,

wavelength 650 nm Frequency response DVD (PCM 48 kHz): 8 Hz to 22 kHz,

CD: 8 Hz to 20 kHz Signal-to-noise ratio More than 80 dB (AUDIO OUT jacks) Harmonic distortion Less than 0.4% Dynamic range More than 85 dB (AUDIO OUT jacks)

FM Tuner

Tuning Range 87.5 - 108 MHz Intermediate Frequency 10.7 MHz

AM Tuner

Tuning Range 530 - 1,720 kHz Intermediate Frequency 450 kHz

Amplifier

Stereo mode 35W + 35W

(8 Ω at 1 kHz, THD 10 %)

Surround mode Front: 35W + 35W

(THD 10 %) Center*: 35W Surround*: 35W + 35W

(8at 1 kHz, THD 10 %)

Subwoofer*: 50W

(8at 30 Hz, THD 10 %)

*Depending on the sound mode set-

tings and the source, there may be no sound output.

Inputs LINE 1, LINE 2, OPTICAL IN

Speakers

Satellite Speaker Passive Subwoofer

Type 2 Way 2 Speaker 1 Way 1 Speaker Impedance 8Ω 8 Ω Frequency Response 110 - 40,000 Hz 45 - 1,500 Hz Sound Pressure Level 83 dB/W (1m) 82 dB/W (1m) Rated Input Power 50W 50 W Max. Input Power 100 W 100 W Net Dimensions (W x H x D) 100 x 147 x 127.5 mm 200 x 425 x 381 mm

(3.9 x 5.8 x 5.0 inches) (7.9 x 16.7 x 15 inches)

Net Weight 0.92 kg (2.0 lbs) 7.06kg (15.6 lbs)

FRONT VIEW (XBS344)

2-1

SECTION 2

CABINET & MAIN CHASSIS

CONTENTS

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

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

2. Woofer Speaker Section (DTE-5105WE)................................................................................2-3

3. Speaker Section (DTE-550TE) ................................................................................................2-4

4. Packing Accessory Section....................................................................................................2-5

2-2

EXPLODED VIEWS

1. Cabinet and Main Frame Section

465

330

452

457

261A

330

A00

A42

A26

A46

A46A

276

277

260

285

300

467

322

323

467

457

467

250

467

457

A43

DG601

A49

A50

A44

284

280

283

276B

A48

266

263

A48A

264

265

457

467

468

A

5

4

3

2

1

BCD

2-3

951

954

960

961

953

957

959

955

956

963

A90

2. Woofer Speaker Section (DTE-5105WE)

2-4

850

852

851A

851

853

854

857

858

A80

3. Speaker Section (DTE-550TE)

2-5

4. Packing Accessory Section

BATTERY

808

CABLE, COAXIAL

806

CABLE SET ASS'Y, RF

810

OPTIONAL PARTS

803A

803B

803C

820 PLUG ASS'Y 1WAY(BLACK)

OWNER'S MANUAL

BOX

801

802

REMOCON

SHEET

PACKING, CASING

900

803

804

CABLE, DIN

822

811

812

PLUG ASS'Y 1WAY(YELLOW)

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..........................................3-6

3. SERVO CIRCUIT ....................................................3-7

4. OSD CIRCUIT .........................................................3-9

5. Y/C CIRCUIT.........................................................3-10

6. TUNER/IF CIRCUIT ..............................................3-14

7. Hi-Fi CIRCUIT.......................................................3-16

BLOCK DIAGRAMS ...............................................3-18

1. POWER(SMPS) BLOCK DIAGRAM 1 .................3-18

2. POWER(SMPS) BLOCK DIAGRAM 2 .................3-20

3. JACK & TUNER BLOCK DIAGRAM ...................3-22

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

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

6. Hi-Fi BLOCK DIAGRAM ......................................3-28

8. SYSTEM BLOCK DIAGRAM ...............................3-30

CIRCUIT DIAGRAMS .............................................3-32

1. POWER(SMPS) CIRCUIT DIAGRAM 1 ...............3-32

2. POWER(SMPS) CIRCUIT DIAGRAM 2 ...............3-34

3. JACK/TUNER CIRCUIT DIAGRAM .....................3-36

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

5. Hi-Fi, DIGEST CIRCUIT DIAGRAM .....................3-40

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

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

• WAVEFORMS.........................................................3-46

• CIRCUIT VOLTAGE CHART ..................................3-48

PRINTED CIRCUIT DIAGRAMS ........................3-50

1. MAIN P.C.BOARD ................................................3-50

2. TUNER P.C.BOARD .............................................3-52

3. POWER P.C.BOARD............................................3-53

4. KEY 1(LEFT) P.C.BOARD ....................................3-54

5. KEY 2(RIGHT) P.C.BOARD..................................3-54

DVD & AMP PART

ELECTRICAL TROUBLESHOOTING

GUIDE ..........................................................................3-56

1. SYSTEM OPERATION FLOW..............................3-56

2. TEST & DEBUG FLOW........................................3-57

3. AUDIO µ-COM CIRCUIT(DVD & AMP)................3-63

DETAILS AND WAVEFORMS ON

SYSTEM TEST AND DEBUGGING ..................3-64

1. SYSTEM 27MHZ CLOCK,

RESET, FLASH R/W SIGNAL..............................3-64

2. SDRAM CLOCK ...................................................3-66

3. TRAY OPEN/CLOSE SIGNAL..............................3-66

4. SLED CONTROL RELATED SIGNAL

(NO DISC CONDITION)........................................3-68

5. LENS CONTROL RELATED SIGNAL

(NO DISC CONDITION)........................................3-68

6. LASER POWER CONTROL RELATED

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

7. DISC TYPE JUDGEMENT WAVEFORMS ...........3-69

8. FOCUS ON WAVEFORMS...................................3-71

9. SPINDLE CONTROL WAVEFORMS

(NO DISC CONDITION)........................................3-72

10. TRACKING CONTROL RELATED

SIGNAL(SYSTEM CHECKING) .........................3-73

11. RF WAVEFORM..................................................3-74

12. MT1379 VIDEO OUTPUT WAVEFORMS...........3-74

13. AUDIO OUTPUT FROM AUDIO DAC ................3-76

14. DVD & AMP WAVEFORMS................................3-77

BLOCK DIAGRAMS ...............................................3-78

1. OVERALL BLOCK DIAGRAM .............................3-78

2. SERVO BLOCK DIAGRAM..................................3-79

3. MPEG & MEMORY BLOCK DIAGRAM...............3-80

4. VIDEO & AUDIO BLOCK DIAGRAM...................3-81

5. DVD & AMP BLOCK DIAGRAM..........................3-82

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

1. MPEG CIRCUIT DIAGRAM..................................3-83

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

3. AUDIO, µ_COM

CIRCUIT DIAGRAM(DVD & AMP).......................3-87

4. DIGITAL AMP CIRCUIT

DIAGRAM (DVD & AMP)......................................3-79

5. PWM & CODEIC

CIRCUIT DIAGRAM (DVD & AMP)......................3-91

6. INTERFACE

CIRCUIT DIAGRAM (DVD & AMP)......................3-93

• CIRCUIT VOLTAGE CHART..................................3-95

PRINTED CIRCUIT DIAGRAMS ........................3-99

1. DVD & AMP P.C.BOARD .....................................3-99

3-2

OVERALL WIRING DIAGRAM

PMC01

CFG

CAP Vcc

5.2VA

CAP REV'H'

V-limit

MOTOR GND

S.GND

DRUM(L/M)Vcc

CAP CTL

L/M CONTROL

DFG/FG

DRUM CTL

1

2

3

4

5

6

7

8

9

10

11

12

1

2

3

4

5

6

7

8

9

10

11

12

PMC01

SP PB A

SP REC

SP PB B

EP PB B

EP REC

EP PB A

HiFi PB A

HiFi REC

HiFi PB B

1

2

3

4

5

6

7

8

9

1

2

3

4

5

6

7

8

9

PVS01 PSV01

GND

5.3VA

GND

3.8VA

GND

13VA

GND

33VA

GND

-29VA

FD(-)

FD(+)

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

PSW01

32VA

32VA GND

REG 5VA

GND

NC

PWB SENSE

123456789

10

123456789

10

PN101

MUTE

VCC_9V

L-OUT

GND

R-OUT

PLL_CE

PLL_DI

PLL_CLK

PLL_DO

D_GND

RDS_CLK

RDS_DATA

1

2

3

4

5

6

7

8

9

10

11

12

1

2

3

4

5

6

7

8

9

10

11

12

PDM01

H FM_VCC

RF_VCC

LD_DVD

MD_DVD

VR_DVD

GND_PD

VRBF

VC

F

B

A

D

C

B

FOCUS+

TRACKING-

TRACKING+

FOCUS-

SW_PDIC

GND_LCD

LD_CD

MD_CD

VR_CD

123456789

10111213141516171819202122

23

123456789

10111213141516171819202122

23

PV601 P6M01

KEY RETURN 1

KEY RETURN 2

5.3VA VIDEO IN

GND

AUDIO 'L' IN

GND

AUDIO 'R' IN

GND

FD(-)

-27VA

FD(+)

123456789

101112

123456789

101112

PV602 P6M02

REMOCON

GND

FLD CLOCK

FLD DATA

FLD ENA

VOLUME DOWN

VOLUME UP

1234567

PDM03

SPM -

SPM +

FM -

FM +

LM -

LM +

SW(OPEN)

SW(CLOSE)

GND

SW(LOADIN)

GND

123456789

10

11

123456789

10

11

P3D02

CTL(+)

CTL(-)

A/E(+)

A/E(-)

A.REC

A.PB

1

2

3

4

5

6

1

2

3

4

5

6

GND

FULL ERASE

P3D03

1

2

1

2

PTV01 PVT01

GND

V.IN

VCR 'H'

5.0V

MOD CTL

A.IN

GND

1

2

3

4

5

6

7

1

2

3

4

5

6

7

PTV02 PVT02

GND

V.OUT

TU 33V

SIF

GND

NC

AFT

DATA

CLOCK

GND

1

2

3

4

5

6

7

8

9

10

1

2

3

4

5

6

7

8

9

10

5.3VA

NC(-9V)

REG 8V(M)

GND(M)

REG 9V(+9V)

A. GND

REG 3.3V

5V

D. GND

REG 3.3V

A.GND

D.GND

PDV02PVD01

1

2

3

4

5

6

7

8

9

10

11

12

1

2

3

4

5

6

7

8

9

10

11

12

DVD V.IN

GND

DVD A.L IN

GND

DVD A.R IN

GND

VCR A.L OUT

VCR A.R OUT

GND

Pb/B

Y/G

Pr/R

PDV02PVD02

1

2

3

4

5

6

7

8

9

10

11

12

1

2

3

4

5

6

7

8

9

10

11

12

DVD ENA

GND

DVD DATA OUT

DVD DATA IN

DVD CLOCK

DVD RESET

AMP DATA IN

AMP CLOCK

GND

AMP ENA

AMP DATA OUT

AMP RESET

PDV02PVD02

1

2

3

4

5

6

7

8

9

10

11

12

1

2

3

4

5

6

7

8

9

10

11

12

F.A.R.IN

GND(A)

F.A.L.IN

GND(A)

K RTN 1

GDN(D)

F.V.IN

GND(D)

P6602P6603

1

2

3

4

5

6

7

8

1

2

3

4

5

6

7

8

DECK MD

MPEG/AMP

BOARD

RADIO

TUNER

SMPS

BOARD

TIMER

BOARD

KEY BOARD

VCR

TUNER

3-3

ELECTRICAL ADJUSTMENT PROCEDURES

1. Servo Adjustment

1) PG Adjustment

• Adjustment And Specification

• Test Equipment

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

MODE

PLAY

• Adjustment Procedure

a) Insert the SP Test Tape and play. b) Connect the CH1 of the oscilloscope to the H/SW(W373, W374) and CH2 to the Video Out for the VCR. c) Trigger the mixed Combo Video Signal of CH2 to the CH1 H/SW(W373, W374), and then check the dis-

tance (time difference), which is from the selected A(B) Head point of the H/SW(W373, W374) signal to the starting point of the vertical synchronized signal, to 6.5H ± 0.5H (412µs, 1H=63µs). Note - Press FRONT CH UP KEY and FRONT PLAY KEY on Deck playback, and it goes in to ATR PRE-

SET. after the SP Test Tape is inserted.

• PG Adjustment Method

a-1) Payback the SP standard tape b-2) Press the “O” key on the Remote controller and the “PLAY” 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(W373, W374)

R/C TRK JIG KEY 6.5 ± 0.5H

MEASUREMENT POINT ADJUSTMENT POINT SPECIFICATION

V.Out

H/SW(W373, W374)

OSCILLOSCOPE

CH1 CH2

V.outH/SW

R/C KEY

(W373, W374)

H/SW

Composite

VIDEO

6.5H(412µs)

VCR PART

3-4

ELECTRICAL TROUBLESHOOTING GUIDE

1. Power(SMPS) CIRCUIT

NO 5.3VA.

Replace the F101.

(Use the same Fuse)

Is the F101 normal?

Is the R101 normal?

Is the BD101 normal?

NO

Replace the BD101.

Replace the R101.

Is the D102 normal?

Check or Replace the D102.

Replace the D112.

Replace the IC103.

YES

Is Vcc(8.5~21V) supplied to IC101 Pin7?

NO

Is the D112 normal?

Is there about 2.5V at the IC103 Vref?

Check the Main PCB

5.3VA/5.0V Line short?

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

NO 12VA.

Check or Replace the D110.

Is the Vcc(13V) supplied to (+) terminal in D115?

Check or Replace the Motor Vcc.

Is the Vcc(12V) supplied to (-) terminal in D115?

NO

Replace the D115.

YES

(2) No 12VA (TO CAP, DRUM MOTOR)

NO 5.0VA.

5.3VA Line Check.

Is 5.3VA put into the Q160 Emitter?

Is about 5V put into the Q160 Base?

Is the Q162 Base “H”?

NO

Check the Power Control.

NO

Check or Replace the Q162, R157, R158, R159.

YES

Check or Replace the Q162/Q160.

YES

(3) No 5.0V (SYS/Hi-Fi/TUNER)

3-5

NO 5V.

5.3VA Line Check.

Is 5.3VA put into the Q160 Emitter?

Is about 5V put into the Q160 Base?

Is the Q162 Base “H”?

NO

Check the Power Control.

Check or Replace the Q162, R157, R158, R159.

YES

Check or Replace the Q162/Q160

(4) No 5V (TO DVD)

No 33V.

Check the Power Control.

Is Q163 Base “H”?

Check or Replace Q161, R154, R155.

NO

YES

(5) No 33V (TUNER)

No REG 12V.

Check or Replace D110.

Is 13V put into the Q156 Collector?

Is 13V put into the R153 Base?

NO

Check 33V Line.

NO

YES

Check or Replace the Q156, ZD103, R153, C151.

YES

(6) No REG 12V

NO 8V.

Check or Replace the D110.

Is Vcc(13V) supplied to (+) terminal in D114?

Is the Q162 Base “H”?

Is Vcc(12V) supplied to IC151 Pin1?

NO

Check or Replace the D114.

NO

Check the Power Control.

YES

Check or Replace IC151, R170, C154.

YES

(7) No 8V(TO DVD)

3-6

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

YES

NO

NO NO

YES

YES YES

3-7

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

NO

(2) When the Drum Motor

(2) doesn’t run.

Do the DFG Pulses appear at the PMC01 Pin11?

Replace the 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.

NO

YES

NO

YES

3-8

Does the CFG signal appear at the PMC01 Pin1?

Does the PWM signal appear at the IC501 Pin77?

Is “DRUM CTL” 2.8V appear at the PMC01?

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,

NO

YES

When the Capstan Motor doesn’t run,

Does 12VA appear at the PMC01?

YES

Replace the IC501.

YES

NO

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.

NO

3-9

4. OSD CIRCUIT

(1) No OSD display.

(2) I2C BUS CHECK

KEY doesn’t working.

Is 5V applied to the IC501 Pin79?

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

NO

2. SERVO CIRCUIT

(4) KEY doesn’t working

3-10

5. Y/C CIRCUIT

(1) No Video in EE Mode,

No Video in EE Mode

Does the Video signal appear at the IC302 Pins1, 5?

Is there 5V at the IC302 Pin6?

Replace the IC302.

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

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

Does the Video signal appear at the IC301 Pin26?

Does the Video signal appear at the IC501 Pin52?

Does the Video signal appear at the IC602 Pin7?

Check the REG 5V Line. (Power Circuit)

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

Replace the IC301.

Check the path of the signal between the IC301 Pin 26 and IC501 Pins50, 52.

Is there 5V on the plus terminal of the C614?

Check the REG 5V Line. (Power Circuit)

Replace the IC602.

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

YES

NO

YES

Check DVD Video Input (IC602, Pin4), Tuner Video Input (TU701 Pin16), Line Video Input (JK601), respectively.

NO

3-11

3. Y/C CIRCUIT

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

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

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

Does the normal RF signal appear at the IC301 Pin 14?

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

Check the System Circuit. (IC501 Pin18)

Check the V.H.S/W level.

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

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

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

Clean the Drum.

Check the C324.

Check the R328, R347, C322, C323.

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

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

Replace the IC301.

NO

YES

NO

3-12

3. Y/C CIRCUIT

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

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

Does the fsc signal appear at the IC301 Pins41, 50?

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

Replace the X301.

Check the C342, C341, R333.

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

Replace the IC301.

Does the Color signal appear at the IC301 Pin48?

Replace the IC301.

NO

YES

NO

3-13

3. Y/C CIRCUIT

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

YES

NO

YES

Check system part (V.H/SW)

Replace the IC301.

Check the drum

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

REC mode

Check the EE mode

NO

Is EE mode normal?

Is color

normal?

A

YES YES

Is brightness normal?

Does signal appear at IC301 Pins41, 50?

NO

Check X301 oscillation frequency.

YES

Is the brightness signal supplied to IC301 Pins18?

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

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

Check the 5V power

NO

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

Check the REG 5V power

Check system part

Do X301 and X-TAL oscillate?

Check X301.

Is V.H SW supplied to IC301 Pin57?

Does the FM signal appear at IC301 Pins73(SP)/ 66(EP)?

3-14

6. 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

YES YES

Is +33V applied to TU701 Pin14?

YES

Is +5V applied to TU701 Pin3?

NO

Does the video signal appear at IC302 Pin7.

NO

Does the Video signal at the IC501 Pin 52.

YES

NO

Does the Video signal at the IC602 Pin 7.

YES

NO

Check the signal flow from IC602 Pin7 to JK601 Pin Video out.

YES

Check 33V line.

NO

Check 5V line.

NO

YES

Does the Clock signal appear at TU701 Pin9?

Check the lIC Clock Signal of µ-COM Pin71.

NO

YES

Does the data signal appear at TU701 Pin10?

Replace Tuner.

Check the signal flow from IC501 Pin27.(Pin27 is ‘L’ state in Tuner Mode)

Check the signal from IC301 Pin26 to IC501 Pin50.

Check the signal from IC501 Pin52 to IC602 Pin1 and IC602 Pin2. (IC602 Pin2 is ‘L’ state in VHS mode)

Check the lIC Data Signal of µ-COM Pin72.

NO

3-15

(2) No Sound

No Sound.

Check the Vcc of TU701 Pins3, 14.

YES

Check 5.2V, 33V Line.

NO

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 JK601 Audio out(L), (R)

YES

Check the Tuner SIF of TU701 Pin13.

NO

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

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

NO

3-16

Check power.

Check REC start “H” signal of µ-COM.

Check IC501 Pin 19.

(Audio Swich 30)

Check the Vcc of IC801. (Pins 3, 15, 32, 46)

Is Pin 30 of IC801 over

3.5V ?

Is the Head switching signal IC801 Pin 39 O.K?

Check the connection at P3D01 if good then Replace IC801.

Check Ports of µ-COM.

Check A.MUTE port of µ-COM (Pin High of IC501).

Replace IC801.

Hi-Fi Playback.

No sound

Check the Hi-Fi Selection Switch and the Tape quality.

Is the RF waveform at IC801 Pin 23 over 3V Vp-p?

Check the Contact point of Audio Output.

Do Audio signals appear at IC801 Pin 80(L-CH), 78 (R-CH)?

Is IC801 Pin 49(A.Mute) “High”?

Check IC801 Pin 37(Data), Pin 38(Clock).

A.

YES

NO

YES

NO

7. Hi-Fi Circuit

YES

NO

YES

3-17

Hi-Fi REC.

It is impossible to record and playback Hi-Fi Audio signal.

Check Vcc of IC801. (Pins 3, 15, 32, 46)

Check Power.

Check ports of µ-COM.

Check the Port of µ-COM.

Check Audio Input signal Line (9, 11, 12, 71, 73, 74), Tuner(57).

Replace IC801.

Check the Port of u-COM.

B.

Check IC801 Pin 37(Data),Pin 38(CLOCK).

Is IC501 Pin 84(A.Mute) “High”?

YES

Are Audio signals present at IC801

Pins 78, 80?

Do FM Audio signals appear at IC801 Pin 26?

YES

Is IC801 Pin 17(REC “H”) “High”?

Check the Contact Points of Drum

Connector if good then Replace the Drum.

YES

NO

3-18 3-19

BLOCK DIAGRAMS

1. POWER(SMPS) BLOCK DIAGRAM 1

BD101

PW101

BR

(BK)BL(WH)

V101

F101

!

IC105

F102

IC106

!

IC102

T102

IC103

!

T101

!

C103

5.0V REG BLOCK

( IC152, C172 )

C113C114

C122

!!

!

PSW01

32VA

5VA

12VA

PWR SENSE

PSV01

FD(+)

FD(-)

-29VA

33VA

13VA

3.8VA

5.3VA

LINE FILTER

BLOCK

( C101, C102,

L101, L102 )

RECTIFIER & SMOOTHING

BLOCK

( D129, C144, L124, C147 )

FEED-BACK

BLOCK

( R132, R133, C148,

R134, R135, R136,

R137 )

RECTIFIER & SMOOTHING

BLOCK

(D123, C130, ZD121, R127)

RECTIFIER & SMOOTHING

BLOCK

( D126, C140, L122, C141 )

RECTIFIER & SMOOTHING

BLOCK

( D125, R129, C138 )

FEED-BACK

BLOCK

( R122, R121, C136,

R123, R124, R125,

R126 )

12V REG

BLOCK

( IC153, C139 )

PWR SENSE

BLOCK

( R184, R185 )

RECTIFIER & SMOOTHING

BLOCK

( D124, C137, R128 )

DRIVE & S/W BLOCK

QUASI-RESONANT BLOCK

( IC101, R114, R115, C123, C107, BC101, D108, R101, D102, R102, D103, R106, ZD102, Z101, C108,

R104, C109, C110)

RECTIFER & SMOOTHING

BLOCK

( D122, C131, R131,

C132, C133, C135, L122 )

SNUBBER

BLOCK

( R110, C115, D104, C117 )

DRIVE & S/W BLOCK SOFT-START BLOCK

( R107, R108, C121, R105, C120, C119, ZD1103, D105,

R111, BC102 )

RECTIFIER & SMOOTHING

BLOCK

( D127, C142, L123, C146 )

DT-65780M's

3-20 3-21

2. POWER(SMPS) BLOCK DIAGRAM 2

FD(+)

FD(-)

-29VA

GND

33VA

GND

13VA

GND

3.8VA

GND

5.3VA

GND

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

TO SYS

FD(+)

TO SYS

FD(-)

TO SYS

-29VA

TO TU

33VT

TO TU

REG 12VT

TO SYS

5.3VA

TO TU/SYS/ Hi-Fi

5.2VA

TO AVCP

REG 5V

FROM µ-COM

PWR CTL 'H'

PVS01

5.3VA

8V

GND

REG 12VT

3.3V

5V

GND

2.5V

GND

1

2

3

4

5

6

7

8

9

10

11

12

PVD01

33VT BLOCK

(Q163, R168, R169, R170)

12VT BLOCK

(IC164, C162, R171)

8V BLOCK

(IC160, D163,

C163, R161)

3.3V BLOCK

(IC161, D164, C173)

2.5V BLOCK

(IC162, D165, C172)

REG 5V

(Q166, C166, C167,

R174, ZD161)

5.2V BLOCK

(Q167, C168, R175,

R176, R177)

PWR CTL BLOCK

(Q169, C170, R181,

R182, R183)

5V BLOCK

(Q168, R178, R179,

R180, C169)

DT-65780M's

3-22 3-23

3. JACK & TUNER BLOCK DIAGRAM

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

A.IN

TU701

GND A.IN

MOD CTL

5.0V

VCR'H'

V.IN GND

7 6 5 4 3 2 1

PVT01 PVT01

7 6 5 4 3 2 1

CH S/W

REG 5V

CONTROL

V.IN

RF AGC

NC

ENABLE

CLOCK

DATA

AFT

A.OUT

SIF

TU 30V

NC

V.OUT

GND

NC

CLOCK

DATA

AFT GND

SIF

TU 33V

V.OUT

GND

PVT02 PVT02

10

9 8 7 6 5 4 3 2 1

10

9 8 7 6 5 4 3 2 1

C731 10µ/16V

C878 56p

R703

3.9K

C701

4.7µ/50V

C701 15PF

C704

0.1µ

C707 15PF

R708 680

R707 680

C702

220µ/6.3V

C871

4.7µ/50V

C711

R710

C712 1500p

C708

0.1µ

C703

10.1µF

R708 33K

R706 10µM

R711

1.0K

R702

1.0K

57

158

732

IC801

TU 33V

TU VIDEO

71

72

100

CLOCK

671MOD VIDEO

26VCR'H'

1065.0V

81MOD CTL

2IC801

DATA

AFT

DT-65780M's

3-24 3-25

4. Y/C BLOCK DIAGRAM

EP PB 'A'

EP PB 'B'

SP PB 'B'

SP PB 'A'

64

59 58 57 55 54 53

65

67

72

74

ACC DET

ENV DET

C-ROT RF-SW IN

Y/C ENA

Y/C DATA

Y/C CLOCK

V.OUT

AUDIO MUTE HA SW

P

C-LPF

MAIN

CONV

3.58M BPF2

ACC AMP

ACC

DET

CLAMP

Y

LPF

CLAMP

IN

OUT

VCA

CCD

3.58M BPF1

Y/C MIX

6dB

DOUBLE

LIMFMDEM

SUB LPF

MAIN

DE-EM

PB

FM-EQ

FM

AGC

CNC

YNR

COMB

4.21M BPF

SUB

CONV

39

37

36

34

26

22

21

P

B

(PB Mode)

EP REC

SP REC

57

V. H/SW55Y/C ENA54Y/C DATA

53 51 50 49 48 47

39

38

37

36

34

32

30

28

22

21

20

73

70

69

66

Y/C CLOCK

X-TAL

3.58MHZ

C-LPF

MAIN

CONV

4.21M BPF

SUB

CONV

DETAIL

ENH

MAIN

EMPHA

REC

FM-EQ

4.7K

FM

MOD

Y

LPF

YNR

COMB

3.58M BPF1

LINE2

26

V.OUT

DVD

TU/LINE1

VIDEO

AGC

CLAMP

CLAMPINCCD

OUT

VCA

SW

BLOCK

IC302

NL

EMPHA

B-UP AMP

ACC AMP

ACC DET

BGA

REC APC

REC AFC

320FH

VCO

SLDVX01

SERIAL

DECODER

R

B

DT-65780M's

(REC Mode)

3-26 3-27

5. NORMAL AUDIO BLOCK DIAGRAM

IC301

LA71206M

SIF

A_IN

RF_MOD

IC801

LA72670M

TUNER

TU701

10

76

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

4

6

13

1

57

9

2

7111731274

80

78

A. OUT (R)

DVD AUDIO

(System)

IC801

LA72670M

IC301

LA71206M

AMP

EQ

AMP

78

410

A. OUT (R)

MOD. OUT

DATA

CLOCK

R/P HEAD

N.A.IN

53

ENA

55 54

546

From u-COM

80

A. OUT (L)

2

OUTPUT

SELECTOR

EQ

3

2

SIF

DE MOD

INPUT

SELECT

OUTPUT

SELECT

IC301

LA71206M

SIF

IC801

LA72670M

TUNER

TU701

10

76

DET

NORMAL

AUDIO

OUT

LINE AUDIO(R) IN

LINE AUDIO(L) IN

REAR Jack

A. OUT (L)

REC

AMP

4

6

13 57

RF MOD.

A_IN

1 2

9

71

80

78

A. OUT (R)

DT-65780M's

ALC

9

1) EE Mode 2) PB Mode 3) REC Mode

3-28 3-29

6. Hi-Fi BLOCK DIAGRAM

A

B

Hi-Fi/ REC

IC801 LA72670M

A.OUT

To JACK

MODULATOR

A.OUT (To Tu)

24

Hi-Fi PB 'B'

Hi-Fi PB 'A'

Hi-Fi REC

57

12

74

11

73

9

71

6 4

26 27

80

A.OUT 'L'

A.OUT 'R'

78

3

AUDIO INPUT

BLOCK

NORMAL AUDIO

OUT(To AVCP)

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'

DT-65780M's

REAR JACK

FRONT

FM MODU DE MODU

DEMO

DULATE

INPUT

SELECT

OUTPUT SELECT

3-30 3-31

7. SYSTEM BLOCK DIAGRAM

GND MODE S1 MODE S2 MODE S3 MODE S4

MODE S/W

TO/FROM AVCP

T-UP REEL

TAPE TOP

SUP REEL

CST.SW/REC TAP

5V

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

R541

R529

R583

L512

MS501

X502

14MHz

32.768KHz

OSC

X501

1

2

RESET

GND

Vcc

3

5.3VA

5V

IC504

+

C592

+

C503

L501

R557

TAPE END

ES502

C535

R564

R531

OSC

L511 R598 C595 C596

+

C561

TO/FROM DECK

Q503

Q501

CV IN

25

24

23

22

21

79

58

80

88

49

40

37

98

34

IC501

M37760

MODE S1

I-Limit

MODE S2

MODE S3

MODE S4

TOP Sensor

T/U 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

35

36

44

OSC in 2

95

94

87

12

60

9

18

76

90

13

H.A.SW

SQPB

16

59

77

11

DRUM PWM

53

Vcc (OSD)

20

END Sensor

45

OSC out 2

99

Vcc (A/D)

TO/FROM AUDIO(Hi-Fi)

TO/ FROM TU/IF

TO DIGEST

72

100

26

VCR 'H'

PLL DATA

64

63

PLL CLK

CV OUT

AFT

71

52

POWER FAIL

78

A. MUTE 'H'

A. ENV

A. H.SW

REC 'H'

74

68

71

72

CLKI C

2

I C

2

DATA

74

50

COMP IN

17

REC 'H'

15

C.ROT

84

A.MUTE'H'

S clk

S in

S out

8

19

67

66

65

R/C

14

TO Hi-Fi ONLY

2

GND

Vcc

3

IC505

1

DT-65780M's

(X2) DATA

CVIN FROM A/V

50

(X2) DATA

(X2) CLK

PM6001

IC601

FLD DRIVE IC

FLD

P6M01

OSD

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.

OPTIONAL TABLE

03. 07. 15 SR13600A

CIRCUIT DIAGRAMS

1. POWER(SMPS) CIRCUIT DIAGRAM 1

IMPORTANT SAFETYNOTICE

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

NAL CIRCUIT. SPECIALCOMPONENTS ARE SHADED ON THE SCHEMATIC FOR EASYIDENTIFICATION.

THIS CIRCUIT DIAGRAM MAY OCCASIONALLYDIFFER FROM THE ACTUAL CIRCUIT USED. THIS WAY, IMPLEMENTATION OF THE LATEST SAFETY AND PERFORMANCE IMPROVEMENT CHANGES INTO THE SET IS NOTDELAYED 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.

Switching Error. IC101 is defective.

Switching Error. IC104 is defective.

Switching Error. IC105, 106 are defective.

No Power. F101 is defective.

No 5.3VA. D127 is defective.

No 3.8VA. D127 is defective.

No 13VA. D126 is defective.

No 33VA. D125 is defective.

No 32VA. D122 is defective.

Digitron Error. D123, F102, ZD121, D124 are defective.

No power. BD101, TH101 are defective.

3-34 3-35

2. POWER(SMPS) CIRCUIT DIAGRAM 2

SR13601A

R171

4.7K

3-36 3-37

3. JACK, TUNER CIRCUIT DIAGRAM

03. 08. 15 SR13605A

3-38 3-39

4. A/V CIRCUIT DIAGRAM

3

1

7

8

9

1

4

5

2

6

PB Y+C

REC Y+C

WAVEFORM

Auto Tracking is failed.

IC301 Pin 59 is defective.

PB COLOR Signal disappear.

IC301 Pin 57 is defective.

IC301 doesn’t operate.

IC301 Pins 53, 54, 55 are defective.

PB COLOR Signal disappear.

X301 is defective.

EE, PB Screen doesn’t appear.

Q306, Q307 are defective.

Normal Audio Signal is not recorded.

FL301, Q304, Q305 are defective.

3-40 3-41

5. Hi-Fi CIRCUIT DIAGRAM

PB

REC

100

T/W

KTC3875

'02. 12. 04 R13604A

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

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

3-42 3-43

6. SYSTEM CIRCUIT DIAGRAM

1

3

485 6

7

2

WAVEFORM

R597, C590, C589 are defective.

OSD is unstable.

Q501, Q503 are defective.

µ-COM is unstable.

X501, X502 are defective.

µ-COM will not operate.

L511, R598, C595,

C596 are defective.

OSD will not operate.

Just clock

ES501, ES502, LD501 are defective.

Tape mode not working. (Tape remaining on reels) Auto Rew will not working.

RS501, RS502 are defective.

Auto stop occures.

R575, R576, R577, R578 are defective.

Deck will not operate.

3-44 3-45

7. KEY CIRCUIT DIAGRAM

SR13610A

3-46 3-47

• WAVEFORMS

* IC301 Waveform

IC301 Pins 20, 21, 22 100mV/10msec DIV VV/EE

20 Main DE Emphasis Filter 21 Main DE Emphasis out 22 Clamp in

IC301 Pin 32 200mV/10msec DIV EE (VIDEO IN)

IC301 Pin 41 100mV/0.2msec DIV REC/PB (2fsc)

IC301 Pin 25

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

IC301 Pin 49 100mV/0.2msec DIV PB/REC (3.58MHz X-TAL IN)

IC301 Pin 14 100mV/5msec DIV PB (PB RF out)

IC301 Pin 73 500mV/2msec DIV SP REC (REC RF)

IC301 Pin 26 500mV/10msec DIV EE (VIDEO OUT)

IC301 Pin 66 500mV/2msec DIV EP REC (REC RF)

* IC501 Waveform

TekStop : 10.0KS/s

280 Acqs

M5.00ms Ch1Ch1 3.04 V1.00 V

T

1

TekStop : 250KS/s

299 Acqs

M 200µs Ch1Ch1 3.04 V1.00 V

T

1

Tek Stop : 10.0KS/s

18 Acqs

M 5.00ms

Ch1

3.04 V

Trigger Position: 12%

1.00 V

T

1

T

TekStop : 10.0KS/s

27 Acqs

M5.00ms Ch1Ch1 3.04 V1.00 V

T

1

TekStop : 10.0KS/s

35 Acqs

M5.00ms Ch1

Ch1

3.04 V1.00 V

T

1

TekStop : 50.0KS/s

120 Acqs

M1.00ms Ch1Ch1 3.04 V1.00 V

T

1

T

Tek Stop : 5.00KS/s

2 Acqs

M 10.00ms

Ch1

340V

Trigger Level: 340mv

500mV

T

1

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

3-48 3-49

• CIRCUIT VOLTAGE CHART

EE PLAY

MODE

PIN NO.

2.3

2.29

2.31

2.3

0

2.31

2.25

4.93

1

0.97

1.92

1.55

0

2.37

2.39

0

2.46

1.73

3.07

4.96

0

0.36

1.83

1.47

2.25

2.32

2.25

4.08

2.25

3.62

2.97

3.13

2.37

2.35

0

1.82

0

0.83

2.34

0

4.92

4.95

2.27

3.31

3.32

3.94

2.54

2.12

4.95

4.75

4.7

2.31

2.28

2.29

2.31

2.32

2.31

2.27

4.93

1

0.97

1.89

1.53

0

2.55

1.45

0

2.49

1.79

2.29

4.95

0

0.35

1.87

1.6

2.56

2.31

2.26

4.08

2.26

2.8

2.93

3.14

2.37

2.29

0

1.87

0

0.83

2.37

0

4.92

4.95

3.17

3.31

3.32

3.94

2.55

2.09

4.95

4.62

4.52

EE PLAY

MODE

PIN NO.

0.68

0

4.91

2.92

0

3.96

1.76

1.84

4.93

0.18

0.15

0

1.82

0

2.3

4.96

2.3

0

2.3

2.96

0

3.01

5.12

2.95

4.97

2.2

0

0.97

5.17

0

0.5

0

0.4

0.19

0.29

0.68

0

4.78

0

0.68

2.56

2.57

0.93

0

2.56

1.61

2.9

0.94

1.94

0

3.98

1.72

1.85

1.86

4.93

0

0.71

0

2.3

4.96

2.3

0

2.3

2.96

0

3

5.12

2.95

4.97

2.2

0

5.17

5.16

0

0.54

0

0.42

4.06

3.91

0.99

3.42

0

4.78

2.57

0

0.43

2.57

IC302

IC501

EE PLAY

MODE

PIN NO.

0

0.11

5.17

]5.17

5.17

0

5.13

0

5.15

1.52

1.43

5.15

2.19

2.28

0

0.51

0.26

2.35

2.41

0

1.29

0

1.88

0.53

1.88

4.96

2.03

2.6

1.96

0

2.57

0

0.97

2.38

5.07

4.7

5.02

4.75

5.17

0

0.11

5.17

0

5.13

5.17

5.13

0

5.15

1.51

1.44

5.15

2.18

2.27

0

0.55

0

2.34

2.41

0

1.99

0.57

1.98

4.95

2.03

1.92

2.05

0

2.58

4.28

0

0.86

0

5.07

4.45

4.97

4.61

5.17

0

EE PLAY

MODE

PIN NO.

0

4.94

5.03

0

2.69

0.58

0.17

0

0.54

0.1

2.53

2.54

0.21

2.5

2.52

5.08

5.17

2.64

5.19

0

5.14

5.19

0

4.7

1.93

2.01

5.05

1.7

0

5.05

2.51

0

2.27

0

5.06

2.53

0

2.56

9.21

2.48

0

1.79

2.72

4.76

0

4.94

4.98

0

2.67

0.68

2.36

0

1.36

2.54

2.53

0

2.49

2.52

5.08

5.17

1.95

5.19

0

5.14

5.19

0

4.7

1.93

2.01

5.05

1.7

0

5.05

2

0

2.35

0

5.06

2.04

0

2.54

9.18

2.48

IC504

IC505

IC601

IC602

IC801

EE PLAY

MODE

PIN NO.

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

5.19

1.91

0

0.29

0

2.5

1.91

2.49

5.06

2.51

0

2.51

2.52

2.51

0.19

2.25

0

2.24

2.25

0

2.48

0

2.51

5.02

2.64

0

5.06

5.17

0

0.19

2.52

2.51

2.52

0

5.06

2.49

1.9

0

2.05

1.22

3.86

9.2

6.26

1.96

2.2

4.56

2.52

5.19

2.07

0

1.31

0

2.5

2.44

2.49

5.05

2.51

0

0.86

2.44

2.45

2.43

2.42

3.66

2.3

0

2.3

0

0.11

1.34

3.79

5.01

2.65

2.64

0

5.05

5.17

2.57

0

2.45

2.43

2.45

0.25

5.05

2.49

2.42

0

2.06

0

0.25

9.19

0.28

0.29

2.15

0

2.35

EE PLAY

MODE

PIN NO.

3.86

3.15

4.02

3.83

2.45

3.87

4.09

3.88

3.94

0

3.86

0

2.5

3.87

3.17

0

4.42

0

4.4

5.06

0

0.1

0.13

0

0.76

0

0.23

0.24

0

0.32

0.31

0

0.31

0

2.5

0.4

0.22

0

4.3

0

4.3

5.07

0

0.73

0

0.26

0.77

0.76

0

SW601

IC301

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

75

76

77

78

79

80

1

2

3

4

5

6

7

8

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

75

76

77

78

79

80

81

82

83

84

85

86

87

88

89

90

91

92

93

94

95

96

97

98

99

100

1

2

3

1

2

3

1

2

3

4

5

6

1

2

3

4

5

6

7

8

1

2

3

4

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

75

76

77

78

79

80

1

2

3

4

5

6

7

8

9

10

11

12

EE PB EE PB

Base Emitter Collector

PB EE

Location

No.

Q301

Q302

Q303

Q304

Q305

Q306

Q307

Q308

Q309

Q501

Q503

Q504

Q505

Q506

Q507

Q805

Q701

Q702

Q601

Q602

4.26

0.758

0.734

0

4.92

1.828

1.843

5.19

0

0.68

5.17

2.82

1.58

5.07

2.8

2.56

9.02

4.98

0.75

4.96

0

4.93

2.5

2.62

4.91

0

4.48

2.27

2.24

0

3.23

2.08

9.81

5.7

0

4.907

0

4.93

4.91

0

5.15

4.95

4.96

0

5.06

12.58

5.19

0

4.91

0

4.92

4.97

0

5.15

4.95

4.96

3.29

0

5.05

12.99

5.19

0

4.26

1.74

0.72

0

4.92

1.86

2.05

5.19

0

0.68

5.17

2.94

1.58

0

2.6

2.56

9.24

4.97

0.75

4.97

0

4.94

2.45

2.51

4.87

0

4.48

2.18

1.03

0

2.08

9.82

5.7

0

3-50 3-51

PRINTED CIRCUIT DIAGRAMS

1. MAIN P.C.BOARD

LOCATION GUIDE

3-52 3-53

2. TUNER P.C.BOARD

LOCATION GUIDE

3. POWER P.C.BOARD

3-54 3-55

4. KEY 1(LEFT) P.C.BOARD

LOCATION GUIDE

5. KEY 2(RIGHT) P.C.BOARD

LOCATION GUIDE

3-56

ELECTRICAL TROUBLESHOOTING GUIDE

1. System operation flow

Power On

No

Yes

No

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 & AMP PART

3-57

2. Test & debug flow

TEST

Check the POWER PART

No

Yes

No

Yes

No

Yes

Check the POWER PART

Check the regulators or diode(D501).

Check the cable connection. (PDV03)

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 Vol tage

Power PCBA (110V

or 220V)

Switch on the Power PCBA

Is

the DC Voltage

outputs OK?

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

Is 3.3V and 2.5V DC

outputs normal on main

PCBA?

Update

FLASH(IC5A1)

successfully?

Replace FLASH( IC5A1)

A

Communication between VCR & DVD is normally?

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

3-58

A

B

RESET or Power On.

Show LOGO?

Flash

Memory operates

properly?

Check connection lines between FLASH & MT1379 and the FLASH access time whether is sui table 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.(IC402)

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(IC502,IC503) & MT1379 and the SDRAM is damaged.

Check the related circuit of MT1379. (IC501 PIN 161,166, 168 check)

Check the filtering and amp circuit of TV si gnal .(IC507)

NO NO

NO

YES

3-59

B

No

Yes

OKYes

Yes

No

Yes

No

Yes

No

NoNo

No

Does

the SLED move

to inner side when it is at

outer position?

Motor Driver STBY

Pin is High?

Motor Driver STBY

Pin is High?

SL+ and SL- output

properly?

Optical

Lens has movements

for searching

Focus?

Proper F+

& F- outputs?

Check cable connect of the pick-up head.

Proper FOSO outputs

to motor driver?

Check FOSO connection on MT1379 and motor driver.

Check the amp circuit on motor driver.

C

Check the cable connection with MECHA.

Do not put in disc and tray close.

Check the connection line of STBY signal .

Check the related circuit of FMSO.

Check the amp circuit on motor driver.

3-60

C

No

Yes

No

Laser turns on when

reading disc?

LD01 or LD02 output

properly?

Check the laser power circuit on MT1336 and connecting to power transistor. (Q404, Q405)

Check the related circuit on laser power transi stor

Check the related circuit on MT1336 RFL signal .

Collector voltage of power transistor is OK?

(Q404, Q405)

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

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.

Disc ID is correct?

Does spindle rotate?

D

3-61

D

Yes

No No

Yes

No

NoNo

No

Focus ON OK?

Track On OK?

Disc is play?

E

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

3-62

E

NO

YES YES

YES

NO

Normal

Audio output

when disc playback?

TEST END

Audio

DAC received

correct data stream?

Normal

Audio DAC

out? (IC206)

Check Audio filter, amplify, mute circuit. (IC205 Application circuit)?

Check connection between MT1379 & Audio DAC. (Check ARCK, ALRCK ACKL, ASDAT3)

Check the related circuit of Audio DAC. (Check Audio out Pins 8, 5)

3-63

3. AUDIO µ-COM Circuit(DVD & AMP)

YES

Does CD/DVD appear at FLT?

OK

Does Loading appear at FLD?

POWER ON

YES YES

YES

Does no Dise or Time appear at FLD?

NO NO

NO

Does it appear DVD Error at FLD?

Reconnet it.

Refer to SMPS.

Refer to oscillator Circuit.

Check DVD Reset Waveform.

Check IC101 Reset Waveform.

Check 3.3V line.

Check Power dection Circuit.

NO

Check Connector (DVV01) if is normally.

Check power part of Main B/D.

Check oscillator of X101.

Check if PN102 is high.

Check if IC101 Pin53 is high.

Check if IC101 Pin9, 36, 59 is high(5V).

Check if IC101 Pin49 is high.

Replace IC101.

NO

Check if DVD an Audio Micom Insert is OK.

Check Power.

YES

Check DVD Module.

YES

Check SMPS.

YES

3-64

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(SYSTEM µ-COM) IC501 PIN83)

5.2VA

Power Cord in

M_RESET(PDV03 PIN6)

URST(IC501 PIN 188)

FIG 1-2

3-65

3) RS232 waveform during procedure(Downloading)

TXD(J501 PIN3)

RXD(J501 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

3-66

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((PDM03 PIN7)

CLOSE(PDM03 PIN8)

TROPEN(IC402 PIN 1)

TRCLOSE(IC402 PIN 2)

FIG 3-1

3-67

2) Tray close waveform

OPEN((PDM03 PIN7)

CLOSE(PDM03 PIN8)

TROPEN(IC402 PIN 1)

TRCLOSE(IC402 PIN 2)

FIG 3-2

3) Tray open waveform

OPEN(PDM03 PIN7)

CLOSE(PDM03 PIN8)

TROPEN(IC402 PIN 1)

TRCLOSE(IC402 PIN 2)

FIG 3-3

3-68

4. SLED CONTROL RELATED SIGNAL (NO DISC CONDITION)

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

STBY(5V) – (IC401 PIN 50)

SL+(4.7V/3.6V/1.9V) (IC402 PIN 12)

SL-(5.3V/3.7V/2.5V) (IC402 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) (IC402 PIN 9)

F-(4.0V/3.6V/3.2V) (IC402 PIN 8)

FIG 5-1

3-69

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

MDI1(0V/180mV) (IC401 PIN 124)

LD01(5.0V//3.5V) IC401 PIN 125)

LD02(5.0V/3.6V) (IC401 PIN 126)

FIG 6-1

7. DISC TYPE JUDGEMENT WAVEFORMS

F+(IC402 PIN 9)

FE(IC401 PIN 18)

RFL(IC401 PIN 19)

FIG 7-1 (DVD)

3-70

F+(IC402 PIN 9)

FE(IC401 PIN 18)

RFL(IC401 PIN 19)

FIG 7-2 (DVD)

F+(IC402 PIN 9)

FE(IC401 PIN 18)

RFL(IC401 PIN 19)

FIG 7-3 (CD)

3-71

F+(IC402 PIN 9)

FE(IC401 PIN 18)

RFL(IC401 PIN 19)

FIG 7-4 (CD)

8. FOCUS ON WAVEFORMS

FE(IC401 PIN 18)

FOSO(IC501 PIN12)

F+(IC402 PIN 9)

F-(IC402 PIN 8)

FIG 8-1 (DVD)

3-72

FE(IC401 PIN 18)

FOSO(IC501 PIN12)

F+(IC402 PIN 9)

F-(IC402 PIN 8)

FIG 8-2 (CD)

9. SPINDLE CONTROL WAVEFORMS (NO DISC CONDITION)

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

SP-(3.6V/2.4V) (IC402 PIN 10)

SP+(3.6V/4.8V) (IC402 PIN 11)

FIG 9-1

3-73

10. TRACKING CONTROL RELATED SIGNAL(System checking)

TE(IC401 PIN 21)

TRSO(IC501 PIN 13)

T-(IC402 PIN 7)

T+(IC402 PIN 6)

FIG 10-1(DVD)

TE(IC401 PIN 21)

TRSO(IC501 PIN 13)

T-(IC402 PIN 7)

T+(IC402 PIN 6)

FIG 10-2(CD)

3-74

11. RF WAVEFORM

RFOP(2.3V/1.1V) (IC401 PIN 6)

RFON(0.8V/2.0V) (IC401 PIN 7)

FIG 11-1

12. MT1379 VIDEO OUTPUT WAVEFORMS

1) Full colorbar signal(CVBS)

(IC507 PIN 23)

FIG 12-1

3-75

3) C

(IC507 PIN 26)

FIG 12-3

2) Y

(IC507 PIN 21)

FIG 12-2

1) Audio L/R

FIG 13-1

3-76

13. AUDIO OUTPUT FROM AUDIO DAC

(IC206 PIN 8,5)

2) Audio related Signal

ASDAT3(IC501 PIN 157)

ABCK(IC501 PIN 148)

ALRCK(IC501 PIN 149)

ASDATA3

FIG 13-2

3-77

1)

• R311 → FRONT L

2)

• R303 → FRONT R

3)

• R309 → SURROUND L

4)

• R301 → SURROUND R

5)

• R307 → CENTER

6)

• R305 → WOOFER

14. DVD & AMP WAVEFORMS

3-78

BLOCK DIAGRAMS

1. Overall Block Diagram

M

DISC

SPINDLE

MOTOR

LOADING

MOTOR

DECK MECHANISM

DVD:RF0,A,B,C,D

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

PICK

UP

KEY Input

B/Pb

IC5A1

A29L800TA-70

1M

8BIT

FLASH ROM

DVD_ESET

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]

Y

C

L/R

VF+

AC 90V~240V

50HZ/60Hz

VF-

-27VA

5V

3V3M

12V

STBY,TRCLOSE

27MHz

X-TAL

PWRC

DVD_ENA

DVD_CLK

DVD_DATA_IN

TL

DV33

IC505

KS24C021CS

EEPROM

IC206

CS4334(2DAC)

IC205

NJM4580

OP-AMP

RC601

REMOCON

RECEIVER

IC505

RESET IC

LOAD+,LOAD-

F+,F-,T+,T-

SP+,SP-

IC401

MT1336E

RF

SLED

(FEEDING)

MOTOR

SL+,SL-

IC402

LA6560

MOTOR

DRIVER

M

DV33

AV33/DV33/V25

REG_5VA

ACLK

ABCLK

ALRCK

IC507

MM1623XFBE

VIDEO BUFFER

ASPECT

VCC

RVCC

AVCC

AV33

V25

LD01,LD02, IOA, V2.0

VCC/+8V

RVCC

LIMIT

TROUT,TRIN

TROPEN,TRSO,FOSO,DMSO,FMSO

°‹

SCLK,SDEN,SDATA

PWMOUT2

AD[0:7]

VCR

SYS

POWER

BOARD

V1P4

MDI1

APC

DVD_DATA_OUT

5V2A

+P8V

J501

RS232

TXD

RXD

SCL

IC502

IS42S16100-7T

512K

2Banks

16BIT

SDRAM

SD33

IC503

IS42S16100-7T

512K

2Banks

16BIT

SDRAM

SD33

IC506

M12L64164A

1M

4Banks

16BIT

SDRAM

MA[00:10]

BA0

DCLK

DCKE

CS#

RAS#

CAS#

WE#

DQM[0:1]

DQ[16:31]

DQM[2:3]

MA11,BA1

SDA

ASDAT3

IC501

MT1379E

DSP/MPEG

+12V

+9VVCC

DV33

ADIN

SD33

HOME MTK

SANYO

VCC

3-79

IC402

LA6560

Motor Driver

DVD: A,B,C,D, RFO

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

SP+, SP-

M/D

PICK

UP

X501

IC501

MT1379

DVDPLAYER

COMBO

CHIP

IC401

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

IC502

GM72V161621

1M x 16bit

SDRAM

IC503

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

HOME MTK

SANYO

2. SERVO Block Diagram

3-80

3. MPEG & MEMORY Block Diagram

IC503

SDRAM

16M

IC505

EEPROM

IIC501 (MPEG + DSP )

MT1379

IC5A1

FLASH MEMORY

(8 M )

VIDEO

Interface

AUDIO

Interface

RF IC

Interface

VCR SYSTEM

MICOM

ENTERFACE

IC502

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]

X501

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

ASDTA[0:3]

PWR,PCE,PRD

A[0:19]

AD[0:7]

DVD_RESET

DVD_DATA

DVD_ENA

DVD_CLK

DVD_DATA_IN

HOME MTK

SANYO

3-81

4. VIDEO & AUDIO Block Diagram

IC507

VIDEO 6dB

Amp

IC206

AUDIO DAC

(2CH)

IC205

(OP Amp)

LPF&Buffer

CVBS

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

SUPER VIDEO (Y/C)

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

(Y/C)

INTERFACE

MPEG

AUDIO ‘R’

HOME MTK

SANYO

ACLK

ABCK

ALRCK

ADATA3

3-82

5. DVD & AMP Block Diagram

FRONT R+-

SURROUND R+-

FRONT L+-

SURROUND L+-

CENTER

WOOFER

IC710

STA505

IC730

STA505

IC750

STA505

IC770

STA505

IC301

PS9702B

IC501

MT1379

IC101

LC875700B

SDA

SCL

RESET

ADATA 0, 1, 2

8BIT micom

100ns(min bus cycle time)

64K/48K-byte ROM

or 128K-byt e flash ROM

or 1536/4096-byte RAM

VFD driver

SIO

8- bit 4 ch AD C

Digital Audio Processor

6CH PCM PWM

(24Bit,192kHz)

internal system cl ock : 98.304MHz

external : 12.288MHz (8 PLL)

I/O control register (8bit) : SPI , I2C

data(16 or 24bit)

only AD Mode

AMP BLOCK DIAGRAM

max 80W

Speaker jack

505_PDN

505_TH_WAR

IC202

AK4586

Multi CH audio CODEC

ADC 2CH (Dual bit_wide dinam ic range)

DAC 6CH (Multy bit ..)

96kHz,24bi t DIR

NON-PCM bit stream detect

control : serial interface

dinamic range : ADC_100dB , DAC_106dB

Volume control (AC-3)

40V 3.5A

DMOS output stage

50+50W :

THD=10%_30V(8ohm)

80W :

THD=10%_36V(8ohm)

927980

31/32

29/30

2,3/8,9

10,11/16,17

2,3/8,9

10,11/16,17

31/32

29/30

31/32

31,32/

29.30

2,3,8,9/

10,11,

16,17

2,3/8,9

56/57

53/54

70/71

67/68

60/61

63/64

DO

CS

CLK

DI

INT0

INT1

RST

262522

60

32 3443 42 41 2 3 5 2

19 1718 16 14 15 44

AMCLK

7

ALRCK

ABCK

ADATA

8

9

10

19

20

36

7

REAR R

FRONT R

FRONT L

REAR L

CENTER

S/WOOFER

31

30

Analog_L

Analog_R

S/W IC

SPDIF

3

12.288MHz

AMCLK

ALRCK

ABCK

3

Analog_L

Analog_R

SPDIF IN : AK4586 CS493264 PS9706 speaker

Analog L/R : MM1231 AK4586 NJM4560M DVD L/R

5V

32V

3.3V

2.5V

4.5~5.5V

IC203

MM1231

1231_CTRL

33

11 4 9 14

7

43

41

33

32

180

183

184

181

Tuner or radio tuner

HOME MTK

SANYO

SR13607A

Video signal Y

Video signal Color

System not working or screen is abnormal

No Power on

Video signal not appeared

Digitron all not display System not working

VZ-DV51V SANYO

3-83 3-84

CIRCUIT DIAGRAMS

1. MPEG CIRCUIT DIAGRAM

CD/DVD LD will not on

SR13608A

VZ-DV51V SANYO

3-85 3-86

2. RF & SERVO CIRCUIT DIAGRAM

VZ-DV51V SANYO

TUNER_L

TUNER_R

3-87 3-88

3. AUDIO, µ_COM CIRCUIT DIAGRAM(DVD & AMP)

VZ-DV51V SANYO

FRONT_R

FRONT_L

REAR_R

REAR_L

3-89 3-90

4. DIGITAL AMP CIRCUIT DIAGRAM (DVD & AMP)

5. PWM & CODEIC CIRCUIT DIAGRAM (DVD & AMP)

VZ-DV51V SANYO

12,288MHz

R

L

R

L

OPTICAL_IN

3-91 3-92

6. INTERFACE CIRCUIT DIAGRAM (DVD & AMP)

VZ-DV51V SANYO

3-93 3-94

3-95 3-96

• CIRCUIT VOLTAGE CHART

IC401(MT1336E)

STOP PLAY

MODE

PIN NO.

5.23

0

1.75

0

4.91

NC

0.54

4.91

0

4.77

0.12

4.72

0

3.24

0.91

1.65

0

1.99

3.12

3.26

3.12

4.65

NC

0

4.91

3.25

4.91

0

3.22

NC

4.91

2.08

2.07

4.91

NC

5.09

0

4.91

2.16

5.22

0

1.99

0

4.91

NC

1.88

4.91

0

4.77

0.12

4.72

0

3.22

0.91

1.65

0

1.93

3.12

3.25

3.12

4.65

NC

0

4.91

3.24

4.91

0

3.2

NC

4.9

2.03

2.07

4.9

NC

5.08

0

4.91

2.1

STOP PLAY

MODE

PIN NO.

2.04

0

2.36

2.42

4.9

2.4

1.8

4.9

0

5.23

4.93

0

4.93

3.72

0

4.93

6.04

0

6.04

12.09

2.46

0

2.46

0

2.46

0

2.46

0

2.46

0.04

2.46

0.14

2.46

0

1.6

1.63

1.335

1.96

0

2.36

2.42

4.91

2.4

1.9

4.9

0

5.22

4.93

0

4.93

3.71

0

4.93

6.04

0

6.04

12.08

2.44

0

0.92

2.44

0

2.44

0

2.44

0

2.44

0.04

2.44

0.19

2.44

0

1.58

1.62

1.34

IC102

IC103

IC104

IC201

STOP PLAY

MODE

PIN NO.

1.59

1.63

1.68

0

1.99

1.37

2.5

0

3.25

2.5

0

1.63

1.6

1.62

2.41

2.04

4.85

0

3.28

4.85

1.18

1.65

1.63

1.3

0

0.45

0

4.93

0

4.94

4.93

2.46

0

2.47

4.93

1.2

0

2.44

1.58

1.62

1.67

0

1.96

1.29

2.47

0

3.23

2.45

0.8

0.35

1.37

1.62

1.58

1.61

2.39

2.07

4.84

0.01

3.28

0.01

1.15

1.65

1.62

1.25

1.63

0.58

0.03

0.2

0.01

0.02

4.92

0.02

0.01

4.93

2.46

0.02

2.47

2.46

4.92

1.2

0.01

2.45

IC202(AK4586)

STOP PLAY

MODE

PIN NO.

0.01

2.45

0.02

2.45

0.01

4.23

4.93

0

3.18

4.91

3.18

2.92

1.7

0

3.18

0

0.9

0

0.9

1.6

1.62

3.18

0

0.9

0

NC

3.18

0

NC

0

1.59

NC

3.18

0

NC

0

NC

3.18

0

IC301

STOP PLAY

MODE

PIN NO.

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

75

76

77

78

79

80

81

82

83

84

85

86

87

88

89

90

91

92

93

94

95

96

97

98

99

100

NC

0

318

0

1.58

0

1.58

3.18

0

1.58

0

1.58

1.59

3.18

0

1.58

0

1.58

3.18

0

3.09

3.18

0

3.2

0

3.18

0

3.18

0

1.67

NC

0

3.18

0

3.24

0

NC

0

3.18

0

STOP PLAY

MODE

PIN NO.

IC402 (LA6560)

IC501(MT1379)

STOP PLAY

MODE

IC101

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

1

2

3

1

2

3

1

2

3

4

5

6

7

8

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

PIN NO.

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

75

76

77

78

79

80

81

82

83

84

85

86

87

88

89

90

91

92

93

94

95

96

97

98

99

100

101

102

103

104

105

106

107

108

109

110

2.99

5.08

0

5.07

1.95

0

5.08

0

5.08

2.81

1.43

2.07

1.42

2.3

0

5.08

0

3.2

1.88

0

3.13

2.01

2.06

1.52

0

2.07

0

5.09

0

5.09

0

5.06

5.07

0

1.03

5.11

0

5.11

0

5.11

0

5.11

2.84

1.45

2.08

1.37

0.69

2.4

2.35

5.11

0

2.59

0.19

1.58

2.56

2

2.96

0

0.06

0.07

0

5.13

0

5.12

0

5.12

5.08

5.09

5.1

0

5.13

0

2.44

0

2.44

0

4.24

4.93

0

3.21

4.91

3.21

2.95

1.72

0

3.21

0

1.59

1.63

3.22

0

NC

3.21

0

NC

0

1.6

NC

3.21

0

NC

0

NC

3.21

0

NC

0

3.21

0

1.59

0

1.59

3.21

0

1.59

0

1.59

3.21

0

1.59

0

1.59

3.21

0

3.1

3.21

0

3.22

0

3.21

0

3.21

0

1.67

NC

0

3.21

0

3.25

0

NC

0

3.21

0

1.61

0

3.28

0

0.026

5.12

0

5.12

3.21

3.46

2.81

0

0.21

0.22

0

0.21

0.23

0.21

0.23

0.22

0

0.07

1.97

1.96

1.54

0.19

0.21

0.22

0.23

2.28

2.27

2.16

2.08

2.07

2.08

0.13

0.14

0

1.28

5.18

0.14

0

5.08

0

2.03

2.2

0

0.09

0

0.1

0.09

0.08

0

2.27

0

1.9

1.71

2.22

0

0.06

0

0.06

0

2.25

1.23

2.23

2.17

2.18

0

0.15

0.16

0

1.28

5.05

0.16

STOP PLAY

MODE

PIN NO.

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

0.15

0.13

0.14

5.1

2.07

2.06

0

5.1

0.13

0.14

0

5.08

0.06

0

8.04

0.12

0

3.64

3.62

3.64

3.6

3.62

3.63

3.62

3.64

8.04

1.45

0.27

0.29

1.45

1.47

1.45

0.95

0

1.45

5.15

1.45

1.46

5.08

5.15

0

0.15

0.16

0.15

5.05

2.06

2.09

0

5.05

0.15

0.18

5.03

3.16

2.08

0

8.01

0.06

3.69

3.61

3.53

3.76

2.43

4.85

3.72

3.57

8.01

1.48

1.39

1.32

1.43

0.82

1.43

1.37

1.43

0.9

0

1.43

5.11

1.43

1.45

5.06

5.11

0

STOP PLAY

MODE

PIN NO.

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

1.22

0

0.96

2

0

1.48

0

3.2

0.12

3.25

1.41

0

1.42

3.3

2.53

1.42

0

2.61

0.75

2.83

1.9

1.72

0.68

2.84

0

2.85

1.83

0.91

1.43

1.51

3.3

0.81

1.45

1.82

1.2

2

2.17

2.53

1.96

1.79

0.8

3.3

0

1.22

0

0.9

2.06

1.51

1.47

1.56

1.52

0.06

3.25

1.49

1.41

0

1.42

0

2.53

2.27

1.39

0

2.58

1.46

1

0.89

0.39

0.31

3.16

0

0.66

0.49

1.39

1.2

1.57

1.43

3.29

1.26

1.02

1.6

1.5

2.06

1.95

2.52

1.9

1.72

1.96

1.84

2.63

0.13

0.07

0

STOP PLAY

MODE

PIN NO.

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

75

76

77

78

79

80

81

82

83

84

85

86

87

88

89

90

91

92

93

94

95

96

97

98

99

100

101

102

103

104

105

106

107

108

109

3.25

1.2

0

3.29

0

2.59

2.58

0

2.59

3.29

3.3

3.29

2.57

5.19

2.59

0.12

2.53

2.59

3.29

2.61

3.27

0

0.94

0.78

0.89

0.99

2.52

3.09

0.37

3.08

3.07

0.59

1.57

3.2

2.77

0.22

0

3.32

0.16

3.31

3.3

3.32

0.16

3.32

3.3

0

1.56

0.94

0.41

0.05

0

3.27

0

3.27

1.18

0

3.29

0

2.57

2.58

0

2.56

3.29

2.56

5.18

2.57

0.08

2.52

2.57

3.29

2.61

3.24

0

1.04

1.06

1.15

1.34

2.52

1.33

1.16

1.1

1.08

1.04

2.53

3.13

2.53

1.68

0

1

1.58

1.62

1.08

3.29

1.62

1.09

1.27

1.32

0

1.55

1.25

0

0.06

3.26

0

3-97 3-98

IC505(EEPROM)

IC502(SDRAM) IC5A1(FLASH)

STOP PLAY

MODE

PIN NO.

0.19

3.3

0.18

2.98

3.02

0

2.86

0

2.55

3.03

0.22

0

3.31

0.26

3.31

3.3

3.31

0.16

3.3

0

2.86

0.07

0.09

0.07

0.09

0.07

0.09

0

0.09

0.07

0.06

0

0.07

0

1.74

3.29

1.62

2.38

1.48

0

3.01

2.54

0

2.5

2.51

1.4

1.39

0.34

0

0.98

1.64

1.53

1.15

3.29

1.49

0.89

0

1.07

0

2.53

0.86

0.99

2.51

0.94

1.13

1.19

1.07

0

1.51

1.25

1.64

0

1.65

3.29

1.6

1.64

1.44

0

1.63

3.29

3.27

1.27

2.35

0

0.73

STOP PLAY

MODE

PIN NO.

0

3.01

0

2.04

0

_

0

0.23

0

1.02

0

3.27

1.18

3.27

0.5

0

0.53

3.27

0.59

0

0.72

0

2.73

3.13

3.25

0

2.64

2.52

0

0.09

3.26

_

0.08

0

3.29

0

1.63

0

2.15

1.44

1.43

1.42

2.1

2.07

1.41

1.52

1.43

2.81

3.28

0.12

1.43

3.28

1.26

STOP PLAY

MODE

PIN NO.

1.1

0

0.66

0.85

3.27

0.51

3.06

0

0.06

3.18

3.27

2.94

0.47

2.93

3.21

2.87

0.15

0

3.09

3.27

0

0.15

1.84

1

0.54

0.06

0.05

0

0.73

1.48

2.91

0.07

3.27

1.06

0.47

0

1.12

3.27

1.21

1.31

0

1.43

0.88

0

3.28

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

199

200

201

202

203

204

205

206

207

208

209

210

211

212

213

214

215

216

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

1

2

3

4

5

6

1.52

0

1.07

1.12

3.28

0.97

0

0.98

0.87

3.28

2.56

0.42

3.01

3.22

2.95

1.32

0.05

1.32

1.33

3.29

0

1.36

2.36

2.32

1.75

0.06

0

1.26

1.55

2.53

0

3.28

1.05

0.98

0

0.6

1.24

3.28

0.99

1.34

0

1.44

1.01

0

3.29

IC507(MM1623)

IC510(BUFFER)

STOP PLAY

MODE

PIN NO.

0

3.28

5.09

2.43

5.09

1.45

0

1.45

0

2.47

0

1.14

0

2.42

5.09

2.43

0

2.49

0

2.48

0

1.18

1.76

0

1.76

0

0.06

5.09

0

2.59

0

2.59

0

3.24

0

0.14

0

0.15

0

0.15

5.19

0.14

5.25

0.15

5.23

0

5.25

0.08

1.82

7

8

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

1

2

0

3.29

5.08

2.42

5.08

0

1.69

0

2.46

0

1.76

0

2.42

5.08

2.42

0

2.47

0

2.47

0

2.3

2.17

0

2.24

0

0.05

0

2.55

0

2.56

0

3.23

0

0.08

0

0.09

0

0.08

5.19

0.09

5.24

0.08

5.23

0

5.25

0.16

0.45

IC710

STOP PLAY

MODE

PIN NO.

2.84

2.83

0.69

1.72

1.92

1.7

0

3.27

3.56

3.29

0

0.23

0

1.98

2.28

2.13

1.67

1.99

1.93

2.05

0

1.49

0.16

1.96

0.16

0.99

1.17

0.79

0.15

3.29

1.93

0.16

1.5

0.16

1.21

0.16

1.64

2.05

0

0.07

0

15.6

3.59

0

31.59

15.62

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

1

2

3

4

5

6

7

8

0

3.12

0.26

0.25

0.9

1.45

0

3.29

3.55

3.29

0

0.06

0

0.87

2.64

2.18

1.96

2.01

1.72

2.19

1.94

0

2.03

1.07

1.25

1.1

2.2

1.07

1.82

1.07

3.3

3.09

1.07

2.2

1.07

2.64

1.08

1.48

2.06

0

0.13

0

15.6

31.58

0

31.58

15.62

IC730

STOP PLAY

MODE

PIN NO.

15.62

15.61

31.59

0

31.59

15.61

NC

0

0.02

5.02

3.25

0

3.15

3.24

1.58

26.32

31.58

0

15.6

31.59

0

31.59

15.62

15.61

31.59

0

31.59

15.61

NC

0

0.02

5.02

3.24

0

3.15

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

15.62

15.61

31.59

0

31.59

15.61

NC

0

0.02

5.02

3.24

0

3.15

3.23

1.57

26.31

31.57

0

15.6

31.58

0

31.58

15.62

15.61

31.59

0

31.59

15.61

NC

0

0.02

5.02

3.23

0

3.15

IC750

STOP PLAY

MODE

PIN NO.

3.15

3.24

1.58

26.3

31.58

0

15.6

31.59

0

31.59

15.62

15.61

31.59

0

31.59

15.61

NC

0

0.03

5.06

3.24

0

3.15

3.24

1.58

26.3

31.58

27

28

29

30

31

32

33

34

35

36

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

3.15

3.23

1.57

26.3

31.57

0

15.6

31.58

0

31.58

15.62

15.61

31.59

0

31.59

15.61

NC

0

0.03

5.06

3.23

0

3.15

3.23

1.57

26.3

31.57

Q401 5.2 5.19 0 5.2 5.19 0 Q402 0 0 0 0 0 0.22 Q403 5.08 0 0 4.93 0 0 Q404 5.01 5.08 0 4.96 5.02 0 Q405 5.01 5.08 0.44 3.32 4.01 1.9 Q407 0 0 5.2 0 0 0 Q408 2.85 0 0 2.83 0 0 Q410 5.2 5.2 0 0 5.2 0 Q411 0 0 5.2 0 0 5.19

SECTION

DVD&

NO

STOP

BEECC

PLAY

B

LOCATION GUIDE

3-99 3-100

PRINTED CIRCUIT DIAGRAMS

1. DVD & AMP P.C.BOARD

DECK MECHANISM PARTS LOCATIONS

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

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

DECK MECHANISM DISASSEMBLY

1. Drum Assembly.........................................4-2

2. Plate Top ...................................................4-4

3. Holder Assembly CST ...............................4-4

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

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

6. Gear Assembly Rack F/L ..........................4-4

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

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

9. Arm Assembly Cleaner..............................4-5

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

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

12.Brake Assembly T .....................................4-6

13.Brake Assembly RS ..................................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.Lever T/up / Arm T/up ...............................4-7

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

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

22.Clutch Assembly D35 ................................4-8

23. Brake Assembly Capstan .........................4-8

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

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

26.Plate Slider................................................4-9

27.Lever Tension............................................4-9

28.Lever Spring..............................................4-9

29.Gear Assembly P2/

Gear Assembly P3 ..................................4-10

30.Base Assembly P2/

Base Assembly P3 ..................................4-10

31.Base Loading ..........................................4-11

32.Base Tension...........................................4-11

33.Arm Assembly Idler .................................4-11

DECK MECHANISM ADJUSTMENT

• Tools and Fixtures for Service ...............4-12

1. Mechanism Alignment Position Check....4-13

2. Preparation for Adjustment......................4-14

3. Checking Torque .....................................4-14

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

4-1. Preliminary Adjustment....................4-15

4-2. Precise Adjustment..........................4-15

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

5-1. Preliminary Adjustment....................4-16

5-2. Confirmation of Tape Path between

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

5-3. Precise Adjustment(Azimuth Adjustment)

.........................................................4-17

6. X-Value Adjustment.................................4-17

7. Adjustment after Replacing Drum Assembly

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

8. Check the Tape Travel after Reassembling

Deck Mechanism.....................................4-18

8-1. Checking Audio and RF Locking Time

during Playback after CUE or REV

.........................................................4-18

8-2. Checking for Tape Curling or

Jamming ..........................................4-18

MAINTENANCE/INSPECTION PROCEDURE

1. Check before starting Repairs ................4-19

2. Required Maintenance............................4-20

3. Scheduled Maintenance..........................4-20

4. Supplies Required for Inspection and

Maintenance............................................4-20

5. Maintenance Procedure..........................4-20

5-1. Cleaning...........................................4-20

5-2. Greasing ..........................................4-21

MECHANISM TROUBLESHOOTING GUIDE

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

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

EXPLODED VIEWS

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

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

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

SECTION 4 MECHANISM OF VCR PART

CONTENTS

DECK MECHANISM PARTS LOCATIONS

4-1

• Top View

• Bottom View

20

24

23

20

24

22

21

29

30

29

30

25 32 27 26 28

NOTE : When reassembly perform the

procedure in the reverse order.

1 Drum Assembly 3 Screw A-1 T

2 Plate Top 2 Hook A-2 T

2 3 Holder Assembly CST Chassis Hole A-2 T

2 4 Opener Door Chassis Hole A-2 T

5 Bracket Assembly 3 Hook A-2 T

L/D Motor

2,3,4 6 Gear Assembly Rack F/L 1 Hook, Chassis Hole A-2 T

2,3,4,6 7 Arm Assembly F/L Chassis Hole A-2 T

8 Lever Assembly S/W 1 Hook A-2 T

9 Arm Assembly Cleaner Chassis Embossing A-3 T

10 Head F/E Chassis Embossing A-3 T

11 Base Assembly A/C Head 1 Screw A-3 T

2,3 12 Brake Assembly T 1 Hook A-4 T

2,3 13 Brake Assembly RS 1 Hook A-4 T

2,3 14 Arm Assembly Tension 2 Hook A-4 T

2,3,12,13, 15 Reel S/Reel T A-4 T

14

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 Lever T/Up / Arm T/Up 1 Hook A-5 T

17,18 20

Belt Capstan/Motor Capstan

3 Screw A-6 B

21 Lever F/R Locking Tab A-6 B

20, 21 22 Clutch Assembly D35 Washer A-6 B

23 Brake Assembly Capstan Locking Tab A-6 B

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

25 Gear Sector 1 Hook A-7 B

20,21,23, 26 Plate Slider Shaft Guide A-7 B

24,25

20,21,23, 27 Lever Tension 1 Hook A-7 B

24,25,26

2,3,14,20, 28 Lever Spring Locking Tab A7 B

21,25,23,

24,26

25 29

Gear Assembly P2/Gear Assembly P3

Boss A-8 B

2,3,14,25, 30

Base Assembly P2/Base Assembly P3

Chassis Slot A-8 B

29

2,3,14,25, 31 Base Loading 1 Screw A-9 T

29

2,3,14 32 Base Tension Chassis Embossing A-9 B

2,3,20,21, 33 Arm Assembly Idler Locking Tab A-9 T

22

Starting No.

Procedure

Part Fixing Type

Fig-

ure

View

1) When reassembling, confirm Mechanism and Mode Switch Alignment Position (Refer to Page 4-13)

2) When disassembling, the Parts for Starting No. Should be removed first.

T:Top, B:Bottom

2

7

10

1

31

14

15

8

6

3

4

9

5

11

18

16

17 19 19

12

33

13

15

4-2

DECK MECHANISM DISASSEMBLY

(S3)

(S2)

(S3)

(A)

Stator

Carbon Brush

Drum Motor

Rotor

Drum Sub Assembly

Drum FPC

(S1)

Holder FPC

H1

H2

1. Drum Assembly (Fig. A-1-1)

1) Unplug the Drum FPC Connector.

2) Remove three Screws(S1) on bottom side and separate the Drum assembly.

3) Unhook (H1), (H2) and separate the Holder FPC and Cap FPC.

1-1. Drum Motor

1) Remove two Screws(S2) and disassemble the Stator of the Drum Motor.

2) Remove two Screws(S3) and separate the Rotor of the Drum Motor from the Drum Sub assembly.

NOTE

When reassembling, confirm (A) portion of the Drum Sub assembly whether the Carbon Brush is in there or not.

Fig. A-1

(Fig. B-1)

Holder FPC

Drum FPC

Cap FPC

Figure in the opposite direction

(Fig. A-1-1)

DECK MECHANISM DISASSEMBLY

4-3

(B)

(E)

(C1)

(C)

Plate Top

Arm Assembly F/L

Spring Lever S/W

Gear Assembly Rack F/L

Chassis

Opener Door

Bracket Assembly L/D Motor

Holder Assembly CST

(B')

(C')

(D)

(E')

(H6)

(A)

(B)

Lever Assembly S/W

(H8)

Fig. A-2

(Fig. A-2-1)

(Fig. A-2-2)

(Fig. A-2-6)

(Fig. A-2-7)

(Fig. A-2-5)

(Fig. A-2-3)

(Fig. A-2-4)

4-4

DECK MECHANISM DISASSEMBLY

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

1) Pull the (B) portion of the Plate Top back in direction of arrow and separate the right side of it.

2) pull the (B’) portion of the Plate Top back in direction of arrow and separate the left side of it. (Used tools : (-) type driver, anything tool with sharp point or flat point.)

NOTE

(1) When reassembling, push the Plate Top after alignment

the two position(C), (C’) as below Fig.

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

1) Move the Holder Assembly CST in direction of arrow and separate the left side of it first through the (D) position of the Chassis.

2) Disassemble the right side of the Holder Assembly CST from each guided hole of the Chassis.

NOTE

When reassembling, insert the (E) part of the Holder Assembly CST in the (E’) hole of the Chassis first and assemble the left side of it.

4. Opener Door (Figure. A-2-3)

1) Turn the Opener Door clockwise and remove it through the guide hole of the Chassis.

5. Bracket Assembly L/D Motor (Fig. A-2-4)

1) Unplug the Connector(C1).

2) Unhook three Hooks(H3, H4, H5) on bottom side of the Chassis, lift up the Bracket Assembly L/M and disassemble the Bracket Assembly L/D Motor.

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

1) Move the Gear Assembly Rack F/L in direction of

arrow(A) and unhook the Hook(H6) pulling back in front.

2) Separate the Gear Rack F/L in direction of arrow(B).

NOTE

When reassembling, align the gear part of the Gear Assembly Rack F/L with the Gear Drive as below Fig.

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

1) Move the Arm Assembly F/L in direction of arrow and

separate the left side of it first.

2) Disassemble the Arm Assembly F/L from each guided

hole of the Chassis.

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

1) Unhook the Hook(H8) in the left side of the Chassis and

remove the Lever Assembly S/W.

(B')

(C')

(C)

(B)

(H4)

(H3)

(H5)

Bracket assembly L/M

Gear Rack F/L

Holder assembly CST

(D)

Chassis

Gear Drive

Chassis

(H8)

DECK MECHANISM DISASSEMBLY

4-5

9. Arm Assembly Cleaner (Fig. A-3-1)

1) Breakaway the (A) portion as Fig. A-3-1 from the embossing of the Chassis, turn the Arm assembly Cleaner to clockwise direction and lift it up.

10. Head F/E (Fig. A-3-2)

1) Breakaway the (A) portion of the Head F/E from the embossing of the Chassis, turn it to counterclockwise direction and lift it up.

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

1) Remove the Screw(S4) and lift the Base Assembly A/C Head up.

(A)

Arm Assembly

Cleaner

Base Assembly A/C Head

(S4)

Head F/E

(A)

Chassis

Fig. A-3

(Fig. A-3-1)

(Fig. A-3-3)

(Fig. A-3-2)

4-6

DECK MECHANISM DISASSEMBLY

Brake Assembly T

Spring TB

(H9)

Reel T

Brake Assembly RS

Spring RS

Arm Assembly Tension

Spring Tension

Reel S

Base Tension

(H11)

(H12)

Chassis

(H10)

Fig. A-4

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

1) Unhook the Spring TB from the Hook(H9) of the Chassis.

2) Lift the Brake Assembly T up.

13. Brake Assembly RS (Fig. A-4-2)

1) Unhook the Spring RS from the Hook(H10) of the Chassis.

2) Lift the Brake Assembly T up.

14. Arm Assembly Tension (Fig. A-4-3)

1) Unhook the Spring Tension from the Hook(H11) of the Arm Assembly Tension.

2) Unhook the Hook(H12) of the Base Tension and lift the Arm Assembly Tension up.

NOTE

Difference for Springs

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

1) Difference for Reel S / Reel T

Spring TB Spring RS Color (Black) Spring Tension

Reel S Reel T

(Fig. A-4-1)

(Fig. A-4-3)

(Fig. A-4-4)

(Fig. A-4-2)

DECK MECHANISM DISASSEMBLY

4-7

Opener Lid

Arm

Assembly

Pinch

Base Assembly P4

Arm T/up

Lever T/up

(A)

(B)

(C)

(H13)

(B)

(H13)

Chassis

Fig. A-5

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

1) Breakaway the (A) portion of the Base Assembly P4 from the embossing of the Chassis.

2) Turn the Base Assembly P4 to counterclockwise direction and lift it up.

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

1) Breakaway the (B) portion of the Opener Lid from the embossing of the Chassis.

2) Turn the Opener Lid to clockwise direction and lift it up.

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

1) Lift the Arm Assembly Pinch up.

NOTE

When reassembling, confirm the (C) portion of the Arm Assembly Pinch is inserted to the Chassis hole correctly as Fig.

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

1) Unhook the Hook(H13) of the bottom Chassis and lift the

Lever T/up up.

2) Lift the Arm T/up up.

(Fig. A-5-2)

(Fig. A-5-1)

(Fig. A-5-3)

(Fig. A-5-5)

(Fig. A-5-4)

4-8

DECK MECHANISM DISASSEMBLY

Chassis

(S5)

Belt Capstan

Motor Capstan

Washer(W1)

Lever F/R

Clutch Assembly D35

Brake Assembly Capstan

(L1)

(L2)

(L1)

Fig. A-6

20. Belt Capstan (Fig. A-6-1)/ Motor Capstan (Fig. A-6-2)

1) Remove the Belt Capstan.

2) Remove the three Screws(S5) on bottom Chassis and lift

the Motor Capstan up.

21. Lever F/R (Fig. A-6-3)

1) Unlock the Locking Tab(L1) as Fig. A-6-3 and lift the

Lever F/R up.

22. Clutch Assembly D35 (Fig. A-6-4)

1) Remove the Washer(W1) and lift the Clutch Assembly D35 up.

23. Brake Assembly Capstan

(Fig. A-6-5)

1) Pull the Locking Tab(L2) back in direction of arrow and lift it up.

(Fig. A-6-1)

(Fig. A-6-2)

(Fig. A-6-3)

(Fig. A-6-5)

(Fig. A-6-4)

DECK MECHANISM DISASSEMBLY

4-9

Gear Drive

Washer (W2)

Gear Cam

Plate Slider

Lever Tension

Lever spring

Base Loading

Gear Sector

(L3)

(H15)

(H16)

(H14)

(A)

Chassis

Gear Drive Hole(C)

Gear Cam Hole(B)

Gear Drive Hole(A)

Fig. A-7

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

1) Remove the Washer(W2) and lift the Gear Drive up.

2) Unhook the Hook(H14) of the Gear Cam and lift the Gear

Cam up.

NOTE

When reassembling, align the Gear Drive Hole(A) and the Gear Cam Hole(B) in a straight line after the Gear Drive Hole(C) is aligned with the Chassis Hole as Fig.

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

1) Unhook the Hook(H15) of the Base Loading on bottom

Chassis and lift the Gear Sector up.

26. Plate Slider (Fig. A-7-4)

1) Just lift the Plate Slider up.

27. Lever Tension (Fig. A-7-5)

1) Unhook the (A) portion of the Lever Tension from the Hook(H16) of the Chassis.

2) Turn the Lever Tension to counterclockwise direction and lift it up.

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

1) Unlock the Locking Tab(L3) of the bottom Chassis and lift the Lever Spring up.

(Fig. A-7-4)

(Fig. A-7-5)

(Fig. A-7-6)

(Fig. A-7-1)

(Fig. A-7-2)

(Fig. A-7-3)

4-10

DECK MECHANISM DISASSEMBLY

Gear Assembly P3

Gear Assembly P2

Base Assembly P2

Base Assembly P3

(A)

(B)

Chassis

Gear Assembly P2 Hole

Gear Sector Hole(A)

Plate Slider Hole(B)

Lever Spring Boss

Gear Assembly P3 Hole

Fig. A-8

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

1) Just lift the Gear Assembly P2 up.

2) Just lift the Gear Assembly P3 up.

NOTE

When reassembling, align the two holes of the Gear Assembly P2 and P3 in a straight line after confirmation whether the Gear Sector Hole(A) and the Plate Slider Hole(B) are aligned or not as Fig.

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

1) Move the Base Assembly P2 in direction of arrow(A)

along the guide hole of the Chassis and disassemble it on bottom side.

2) Move the Base Assembly P3 in direction of arrow(B)

along the guide hole of the Chassis and disassemble it on bottom side.

(Fig. A-8-1)

(Fig. A-8-2)

(Fig. A-8-3)

(Fig. A-8-4)

DECK MECHANISM DISASSEMBLY

4-11

(A)

(B) (C)

(S7)

Arm Assembly Idler

Base Loading

Base Tension

Chassis

(D)

Fig. A-9

31. Base Loading (Fig. A-9-1)

1) Remove the Screw(S7).

2) Lift the Base Loading up.

32. Base Tension (Fig. A-9-2)

1) Breakaway the (A) portion of the Base Tension from the embossing of the Chassis.

2) Turn the Base Tension to counterclockwise direction and lift it up.

33. Arm Assembly Idler (Fig. A-9-3)

1) Make narrower the two parts, (B) and (C), as Fig. A-9-3.

2) Lift the Arm assembly Idler up.

NOTE

When disassembling, be careful not to be caught the (D) part by the Chassis as Fig.

(Fig. A-9-1)

(Fig. A-9-2)

(Fig. A-9-3)

DECK MECHANISM ADJUSTMENT

4-12

• Tools and Fixfures for Service

1. Cassette Torque Meter

1. SRK-VHT-303(Not SVC part)

1. Parts No: D00-D006

4. Torque Gauge Adaptor Parts No:D09-R001

5. Post Height Adjusting Driver Parts No:DTL-0005

6. + Type Driver (ø 5)

2. Alignment Tape Parts No NTSC: DTN-001 PAL:DTN-0002

3. Torque Gauge

3. 600g.Cm ATG

3. Parts No:D00-D002

SRK

V

ID

E

O

C

A

S

E

T

E

T

O

R

Q

U

E

M

E

T

E

R

V

H

T

-30 3

S

R

K

-

V

H

T

-

S

R

K

-

V

H

T

300

2

50

2

00

150

50

0

300

250

2

00

150

5

0

1

00

Zenith XBS344, DT-66550M Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual