Zenith DVT654 Manuel utilisateur

SERVICE MANUAL

Product Type: 5 DISC DVD HOME THEATER

Chassis: CMR-0538

Manual Series: DVT654

Manual Part #: 3829RGN005H

Model Line: C

Product Year: 2006

GENERAL

ELECTRICAL

EXPLODED VIEWS

SPEAKER PART

REPLACEMENT PARTS LIST

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

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

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

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

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

Published March 2006

by Technical Publications

Zenith Electronics Corporation

201 James Record Road

Huntsville, Alabama 35824-1513

Printed in U.S.A

Model Series:

CONTENTS

DVT654

- 1-1 -

[CONTENTS]

SECTION 1.GENERAL

• SERVICING PRECAUTIONS ................................................................................................ 1-2

• ESD PRECAUTIONS............................................................................................................. 1-4

• SPECIFICATIONS...................................................................................................................1-5

SECTION 2. ELECTRICAL

• AUDIO TROUBLESHOOTING GUIDE .................................................................................. 2-1

• DVD TROUBLESHOOTING GUIDE...................................................................................... 2-5

• DVD DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING..................... 2-13

• WIRING DIAGRAM.............................................................................................................. 2-25

• BLOCK DIAGRAMS............................................................................................................. 2-26

• AUDIO PART SCHEMATIC DIAGRAMS ............................................................................. 2-31

• DVD PART SCHEMATIC DIAGRAMS................................................................................. 2-47

• PRINTED CIRCUIT DIAGRAMS ......................................................................................... 2-53

• CIRCUIT VOLTAGE CHART................................................................................................ 2-63

SECTION 3. EXPLODED VIEWS

• CABINET AND MAIN FRAME SECTION .............................................................................. 3-1

• DECK MECHANISM EXPLODED VIEW .............................................................................. 3-3

• PACKING ACCESSORY SECTION ...................................................................................... 3-5

SECTION 4. SPEAKER PART.................................................................................. 4-1

SECTION 5. REPLACEMENT PARTS LIST ............................................................. 5-1

- 1-2 -

SECTION 1. GENERAL

SERVICING PRECAUTIONS

NOTES REGARDING HANDLING OF THE PICK-UP

1. Notes for transport and storage

1) The pick-up should always be left in its conductive bag until immediately prior to use.

2) The pick-up should never be subjected to external pressure or impact.

2. Repair notes

1) The pick-up incorporates a strong magnet, and so should never be brought close to magnetic materials.

2) The pick-up should always be handled correctly and carefully, taking care to avoid external pressure and

impact. If it is subjected to strong pressure or impact, the result may be an operational malfunction and/or

damage to the printed-circuit board.

3) Each and every pick-up is already individually adjusted to a high degree of precision, and for that reason

the adjustment point and installation screws should absolutely never be touched.

4) Laser beams may damage the eyes!

Absolutely never permit laser beams to enter the eyes!

Also NEVER switch ON the power to the laser output part (lens, etc.) of the pick-up if it is damaged.

5) Cleaning the lens surface

If there is dust on the lens surface, the dust should be cleaned away by using an air bush (such as used

for camera lens). The lens is held by a delicate spring. When cleaning the lens surface, therefore, a cot-

ton swab should be used, taking care not to distort this.

6) Never attempt to disassemble the pick-up.

Spring by excess pressure. If the lens is extremely dirty, apply isopropyl alcohol to the cotton swab.

(Do not use any other liquid cleaners, because they will damage the lens.) Take care not to use too much

of this alcohol on the swab, and do not allow the alcohol to get inside the pick-up.

Storage in conductive bag Drop impact

NEVER look directly at the laser beam, and don’t let

contact fingers or other exposed skin.

Magnet

How to hold the pick-up

Conductive Sheet

Cotton swab

Pressure

- 1-3 -

NOTES REGARDING COMPACT DISC PLAYER REPAIRS

1. Preparations

1) Compact disc players incorporate a great many ICs as well as the pick-up (laser diode). These components

are sensitive to, and easily affected by, static electricity. If such static electricity is high voltage, components

can be damaged, and for that reason components should be handled with care.

2) The pick-up is composed of many optical components and other high-precision components. Care must be

taken, therefore, to avoid repair or storage where the temperature of humidity is high, where strong magnet-

ism is present, or where there is excessive dust.

2. Notes for repair

1) Before replacing a component part, first disconnect the power supply lead wire from the unit

2) All equipment, measuring instruments and tools must be grounded.

3) The workbench should be covered with a conductive sheet and grounded.

When removing the laser pick-up from its conductive bag, do not place the pick-up on the bag. (This is

because there is the possibility of damage by static electricity.)

4) To prevent AC leakage, the metal part of the soldering iron should be grounded.

5) Workers should be grounded by an armband (1M Ω)

6) Care should be taken not to permit the laser pick-up to come in contact with clothing, in order to prevent

static electricity changes in the clothing to escape from the armband.

7) The laser beam from the pick-up should NEVER be directly facing the eyes or bare skin.

Resistor

(1 Mohm) Conductive

Sheet

Resistor

(1 Mohm)

Armband

- 1-4 -

ESD PRECAUTIONS

Electrostatically Sensitive Devices (ESD)

Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components

commonly are called Electrostatically Sensitive Devices (ESD). Examples of typical ESD 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 ESD devices, place the assembly on a conductive sur-

face 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 ESD 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 ESD devices.

5. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ESD

devices.

6. Do not remove a replacement ESD device from its protective package until immediately before you are

ready to install it. (Most replacement ESD devices are packaged with leads electrically shorted together by

conductive foam, aluminum foil or comparable conductive materials).

7. Immediately before removing the protective material from the leads of a replacement ESD device, touch the

protective material to the chassis or circuit assembly into which the device will by installed.

CAUTION : BE SURE NO POWER IS APPLIED TO THE CHASSIS OR CIRCUIT, AND OBSERVE ALL

OTHER SAFETY PRECAUTIONS.

8. Minimize bodily motions when handing unpackaged replacement ESD devices. (Otherwise harmless motion

such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can gener-

ate static electricity sufficient to damage an ESD device).

CAUTION. GRAPHIC SYMBOLS

THE LIGHTNING FLASH WITH APROWHEAD SYMBOL. WITHIN AN EQUILATERAL TRIANGLE, IS

INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF UNINSULATED “DAN-

GEROUS VOLTAGE” THAT MAY BE OF SUFFICIENT MAGNITUDE TO CONSTITUTE A RISK OF

ELECTRIC SHOCK.

THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE

SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE

LITERATURE.

- 1-5 -

SPECIFICATIONS

GENERAL

Power supply Refer to main label

Power consumption Refer to main label

Mass 5.5 kg

External dimensions (W x H x D) 435 x 54 x 350 mm

Operating conditions Temperature: 5°C to 35°C, Operation status: Horizontal

Operating humidity 5% to 85%

CD/DVD

Laser Semiconductor laser, wavelength 650 nm

Signal system NTSC 525/60

Frequency response (audio) 150 Hz to 18 kHz

Signal-to-noise ratio (audio) More than 75 dB (1 kHz, NOP -6 dB, 20 kHz LPF/A-Filter)

Dynamic range (audio) More than 70 dB

Harmonic distortion (audio) 0.5 % (1 kHz, at 1W position) (20 kHz LPF)

VIDEO

Video input 1.0 V (p-p), 75 Ω, negative sync., RCA jack x 2

Video output 1.0 V (p-p), 75 Ω, negative sync., RCA jack x 1

S-video output (Y) 1.0 V (p-p), 75 Ω, negative sync., Mini DIN 4-pin x 1

COMPONENT VIDEO OUT (Y) 1.0 V (p-p), 75 ohms, negative sync, RCA jack x 1

(Pb)/(Pr) 0.7 V (p-p), 75 ohms, RCA jack x 2

TUNER

Tuning Range 87.5 - 108.0 MHz or 65.0 - 74.0 MHz, 87.5 - 108.0 MHz

Intermediate Frequency 10.7 MHz

Signal-to Noise Ratio 60 dB (Mono)

Frequency Response 150 - 8,000 Hz

AM[MW]

Tuning Range 520 - 1,720 kHz

Intermediate Frequency 450 kHz

AMPLIFIER

Stereo mode 150W + 150W (6Ωat 1 kHz, THD 10 %)

Surround mode Front: 150W + 150W (THD 10 %)

Center*: 150W

Surround*: 150W + 150W (6Ωat 1 kHz, THD 10 %)

Subwoofer*: 250W (4Ωat 30 Hz, THD 10 %)

SPEAKERS Front/Rear Speaker Center speaker Passive Subwoofer

(LHS-75SGS) (LHS-75SGC) (LHS-75SGW)

Type 2 Way 2 Speaker 2 Way 2 Speaker 1 Way 1 Speaker

Impedance 6 Ω6 Ω4 Ω

Frequency Response 145 - 20,000 Hz 120 - 20,000 Hz 50 - 1,500 Hz

Sound Pressure Level 85 dB/W (1m) 85 dB/W (1m) 83 dB/W (1m)

Rated Input Power 150 W 150 W 250 W

Max. Input Power 300 W 300 W 500 W

Net Dimensions (W x H x D) 104 x 235 x 120 mm 220 x 115 x 120 mm 195 x 398 x 419 mm

Net Weight 1.0kg 1.0kg 6.6kg

(* Depending on the sound mode

settings and the source, there may

be no sound output.)

- 2-1 -

AUDIO TROUBLESHOOTING GUIDE

INSERT

POWER CORD.

RED LED

ON?

IS POWER ON?

CHECK POWER PLUG

AND POWER SUPPLY CIRCUIT

DOES INITIAL

READ WORK?

DOES IT PLAY?

YES

CHECK POWER SUPPLY CIRCUIT.

CHECK LASER CIRCUIT

CHECK TRACKING SERVO CIRCUIT.

TURN POWER ON.

CHECK FOCUS CIRCUIT.

CHECK DISC.

DOES IT OUTPUT

AUDIO?

YES

NO CHECK AUDIOCIRCUIT.

1. POWER CHECK FLOW

SECTION 2. ELECTRICAL

- 2-2 -

2. AUDIO µ-COM CIRCUIT

POWER ON

Does DVD Error

appear at

FLD?

Does

AV 1/2 FM87.5

appear at FLD?

Check

Connector(PN902)

Check power part

of Main B/D.

Check oscillator

of x101.

Check if IC101

PIN80 is High.

Check if IC101

PIN92 is High.

Check if IC101 PIN

31, 32, 51, 88 are high

(5V).

Check if IC101

PIN96 is High.

Replace IC101.

Does CD/DVD

appear at FLD?

Reconnect PN902.

Refer to SMPS

OK.

Refer to oscillator

Circuit.

Check DVD Reset Waveform.

Check IC101 Reset Wavefrom.

Check 5V line.

Check Power section Circuit.

Does READING

appear at FLD?

Does no Disc or

Time appear at FLD?

Check if DVD an Audio

Micom Interface is OK.

Check power.

Check DVD Module.

Check SMPS.

- 2-3 -

3. FRONT CIRCUIT (1/2)

PIN104 Pins

PIN : -27V

PIN 6 : -18V

PIN7 : -22V

PIN : 5V

- 2-4 -

4. FRONT CIRCUIT (2/2)

CHECK

IF R029, R036~R040,

R046~R051

OK.

REPLACE R029,

R036~R040,

R046~R051

Check

if PN104 pins10, 11

Waveform OK.

Check

if the Remocon

Waveform of the

PN104 pin16

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