THOMSON DTH175EL Manuale utente

THOMSON DTH175EL Service Manual

THOMSON DTH175EL

Service Manual

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THOMSON DTH175EL Service Manual

Table of Contents

General Section

Cautions/Warnings

Safe Warnings

Precautions

Software Upgrade

Exploded View

Circuit Diagram and Component Layout

MPEG IC Block Diagrams

Power supply Circuit Diagram and Component Layout

MPEG Circuit Diagram and Component Layout

Front panel Circuit Diagram and Component Layout

Servicing Procedures

Power Supply Trouble Service Flow Chart

Read Disc Trouble Service Flow Chart

Composite Video Trouble Service Flow Chart

Scart Video Trouble Service Flow Chart

S-Video Trouble Service Flow Chart

Composite Analogy Audio Trouble Service Flow Chart

Front Control Trouble Service Flow Chart

Remote Control Trouble Service Flow Chart

Parts List

Power parts list

MPEG parts list

Front panel parts list

AV Output parts list

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THOMSON DTH175EL Service Manual

General Section

Cautions/Warnings

Product Safety Notice

Parts marked with the symbol in the schematic diagram have

critical characteristics.

Use ONLY replacement pares recommended by the manufacturer.

It is recommended that the unit be operated from a suitable DC

supply or batteries during initial check out procedures.

Leakage Current Check/Resistance Check

Before returning the unit to the customer, make sure you make

either (1) a leakage current check or (2) a line to insulated

resistance check.

If the leakage current exceeds 0.5 milliamps, or if the resistance

from chassis to either side of the power cord is less than 240 K

ohms, the unit is defective.

WARNING: DO NOT return the unit to the customer until the

problem or located and corrected.

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THOMSON DTH175EL Service Manual

Safe Warnings

Protection of Eyes from Laser Beam

To protect eyes from invisible laser beam during servicing

DO NOT LOOK AT THE LASER BEAM

Laser Caution

CAUTION

Adjusting the knobs, switches, and controls, etc. or taking actions

not specified herein may result in a harmful emission of laser

beams. This CD Changer must be adjusted and repaired only by

qualified service personnel.

Laser symbol:

THIS IS COMPACT DISC PLAYER IS CLASSIFIED AS A CLASS 1 LASER

PRODUCT.

THE LASS 1 LASER PRODUCT LABEL IS LOCATED ON THE REAR EXTERIOR.

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THOMSON DTH175EL Service Manual

Precautions

ESD Precautions in Repairing

1. Do not apply excessive pressure on the mechanical parts

(moving pares), including the Pickup Block, as extremely high

mechanical precision or required in these parts.

2. When soldering the microprocessor and signal processing IC’s,

use a ceramic soldering iron or a soldering iron whose metal part is

grounded since they are not resistant to static electricity.

3. When removing the solder or soldering the laser shorting lands

for the Pickup Block, use a ceramic soldering iron or a soldering

iron whose metal part is grounded since the laser diode or not

resistant to static electricity.

DVD Loading Unit Precautions when handling the Mechanism Block

1. Do not loosen any screws in the Pickup Block.

2. Do not adjust any screws in the Mechanism Block except for

“Tilt Adjust Screws”, as they are adjusted precisely at the factory.

3. Replacement of the Pickup Block is impossible. Always replace

the Traverse Ass’y when the Pickup Block needed to be replaced.

Do not touch the lens or lens holder of the Pickup Block.

4. The Guide Rails of the Pickup Block are greased. Take care

when handing.

5. When you try to slide the Pickup Block, do not press or pull it

directly. Always turn the dive gears with your fingers.

6. Be sure that the anti-slipping rubber on the turntable or clean. If

there is dust or it is greasy, clean the part with the liquid that

contains 50% each of alcohol and water.

7. When removing the Mechanism P.C.B. Ass’y, you need to

short-circuit the laser diode shorting lands beforehand.

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THOMSON DTH175EL Service Manual

Software Upgrade

You can upgrade DVD Player using the software we provide as following step:

―Creating a software upgrade CD

―Use only a new CD-R/CD-RW(not an erased one).

―Give the CD a name of your choice(e.g. version and unit name).

―Burn the unpacked documents on the CD-R/CD-RW.

―The root directory(uppermost level) of the software upgrade CD

Attention: If a failure should occur during the software upgrade (e.g. a mains failure), it

may happen that the units function and a restart of the upgrade function are no longer

possible. If this should be the case, you must replace the intergraded FLASH ICs with

preprogrammed ICs (see corresponding spare parts list).

─Insert the upgrade CD (see corresponding spare parts list) and observe the hints on the

display and on the screen of the TV set.

─Carry out an initialization of the set.

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THOMSON DTH175EL Service Manual

Exploded View

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THOMSON DTH175EL Service Manual

Circuit Diagram and Component Layout

MPEG IC Block Diagrams

Fig. 2-1 MT1389

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THOMSON DTH175EL Service Manual

Fig. 2-2 Functional block diagram

Fig.2-3 DVD Player system Diagram

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THOMSON DTH175EL Service Manual

Table1. 1389C Pin Description

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