Thomson DTH-4500 Service manual

SERVICE MANUAL DOCUMENTATION TECHNIQUE TECHNISCHE DOKUMENTATION DOCUMENTAZIONE TECNICA DOCUMENTACION TECNICA

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WARNING : Before servicing this chassis read the safety recommendations.

ATTENTION : Avant toute intervention sur ce châssis, lire les recommandations de sécurité.

ACHTUNG : Vor jedem Eingriff auf diesem Chassis, die Sicherheitsvorschriften lesen.

ATTENZIONE : Prima di intervenire sullo chassis, leggere le norme di sicurezza.

IMPORTANTE : Antes de cualquier intervención, leer las recomendaciones de seguridad.

Code : 351 400 20 - 1200 / 4,6M - DVD DTH4500 Print.

VIDEO

DTH4500

DVD DTH4500

Addition to SM

Additif au SM

Ergänzung zum SM

Aggiornamento del SM

Suplemento al SM

351 272 00

Page Page

TECHNICAL SPECIFICATIONS .......................................... 4

SAFETY NOTICE AND PRECAUTIONS ............................... 5

ADJUSTMENT PROCEDURES

1. Handling the optical pickup ..................................... 6

2. Pickup disassembly and assembly .......................... 3

3. Disassembly and assembly

3.1 Cabinet and PCB ...........................................3

3.1.1 Removing the Top Cabinet ............................3

3.1.2 Removing the Door-Tray ............................... 3

3.1.3 Removing the Front-Panel Assembly

and Key PCB .................................................. 4

3.1.4 Removing the Deck Assembly ....................... 4

3.1.5 Removing Main PCB and Jack PCB................ 4

3.2 PCB location ................................................. 4

3.3 Deck .............................................................. 5

3.3.1 Removing PCB Deck Assembly, P/U Deck...... 5

3.3.2 Removing the Tray Disc................................. 5

3.3.3 Removing Slider Housing............................... 5

3.3.4 Removing Housing Assembly ........................ 5

3.3.5 Removing Sub Chassis .................................. 6

3.3.6 Removing Bracket Deck ................................. 6

3.4 Connector Diagram ..................................... 6

BLOCK DIAGRAMS

General Block Diagram .............................................. 7

SCHEMATIC CIRCUIT DIAGRAMS

Servo ...................................................................... 9

AV processing .........................................................13

System Control ....................................................... 17

Display and control ................................................ 21

Audio ...................................................................... 23

Keyboard.................................................................. 26

Headphone .............................................................. 26

Audio 5.1 channel ................................................... 27

Video decoder DTH4200 .......................................... 41

Power supply ........................................................... 43

CD Motor Control DTH4000-DTH4200..................... 46

PRINTED CIRCUIT BOARD LAYOUTS

Jack PCB..................................................................29

Main PCB................................................................. 33

Keyboard ................................................................. 35

CD Motor Control .................................................... 48

ABBREVIATION LIST ....................................................... 57

DVD DTH4500

2 First issue 12 / 00

: Please refer to DVD DTH4000/4200 Service Manual Part N° 351 272 00 : Se référer à la documentation technique DVD DTH4000/4200 code 351 272 00 : Bitte schlagen Sie im DVD DTH4000/4200 Service Manual 351 272 00 nach : Consultare la documentazione tecnica del telaio DVD DTH4000/4200, codice : 351 272 00 : Referirse a la documentación básica del DVD DTH4000/4200, código : 351 272 00

DVD DTH4000/DTH4200

4 First issue 08 / 00

TECHNICAL SPECIFICATIONS

Power Source : AC 110V - 240V +/- 10%, 50Hz/60Hz

Power Consumption : 18W (approx. 2,4W when power is OFF)

Weight : 3,3 Kg

Dimension : 430 (W) x 89 (H) x 280 (D) mm (excluding protrusions)

Operating Temperature Range : +5 to +35 degrees Celsius (+41° to +95° F)

Operating Humidity Range : 10 to 75% (no condensation)

Signal system : PAL 50 - 60Hz (PAL 625/50, PAL 525/60),

NTSC or PAL 60Hz capable TV set is required to play back NTSC discs.

Disc played :

(1) DVD-Video disc :

PAL and NTSC 12/8 cm single-sided, single-layer 12/8 cm single-sided, double-layer 12/8 cm double-sided, single-layer 12/8 cm double-sided, double-layer

(2) Audio CD :

12/8 cm disc

(3 Video CD :

PAL and NTSC, 12/8 cm side (4) S-Video CD (5) most CD-Rs and CD-RWs (DTH4200 only)

Audio signal output :

(1) Frequency response : DVD linear audio 48KHz sampling : 4Hz to 22KHz (EIAJ)

DVD linear audio 96KHz sampling : 4Hz to 44KHz (EIAJ)

CD Audio : 4Hz to 20KHz (EIAJ) (2) S/N ratio : 105dB (EIAJ) (3) Dynamic range : DVD linear audio : 100dB (EIAJ)

CD audio : 100dB (EIAJ) (4) Wow & flutter : below measurable limits (5) Total harmonic distortion : less than 0.005%

Pickup : Wave length : 655nm, Laser power : CLASS 2

2 Laser diodes (DTH4200 only)

DVD DTH4000/DTH4200

First issue 08 / 00 5

PREVENTION OF ELECTRO STATIC DISCHARGE (ESD) TO 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 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 ESD devices.

4. Use only an anti-static solder removal devices. 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 your 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 materials from the leads of a replacement ESD 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 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 generate static electricity sufficient to damage an

ESD device).

There are special components used in this equipment which are imporant for safety, these part are marked by symbol on the schematic circuit diagrams and replacement part list. It is essential that these safety critical components are replaced with the manufacture’s specified parts to prevent electric shock, fire, or other hazards. do not attempt to modify the original design without permission of the manufacturer.

DANGER : Invisible laser radiation when open and interlock failed

or defeated. Avoid direct exposure to beam.

ATTENTION : Le rayon laser est invisible. Eviter l'exposition directe

lors de la maintenance.

VORSICHT BEI Bei geöffneter Schublade und Defekt der Sicherheits -

REPARATUREN : vorrichtungen besteht die Gefahr unsichtbaren

Laserlichts. Niemals direkt in den Laserstrahl sehen.

ATTENZIONE : Il raggio laser è invisibile. Evitare l'esposizione diretta

durante la manutenzione.

IMPORTANTE : El rayo laser es invisible. Evitar la exposición directa

en el momento del mantenimiento.

CLASS 1 LASER PRODUCT APPAREIL A LASER DE CLASSE 1 LASER KLASSE 1 APARATO CON LASER DE CLASE 1 APPARECCHIO CON LASER DI CLASSE 1

IMPORTANT SAFETY NOTICE

DVD DTH4000/DTH4200

6 First issue 08 / 00

ADJUSTMENT PROCEDURES

1. Handling the optical pickup

The laser diode used in the optical pickup may break down due to potential differences caused by electricity produced by clothing or the human body, care should therefore be taken to prevent electrostatic discharge whilst repairing the optical pickup.

The following method is recommended. (1) Place a conductive sheet on the work bench (The black sheet

used for wrapping repair parts.)

(2) Place the set on the conductive sheet so that the chassis is

grounded to the sheet.

(3) Place your hands on the conductive sheet (doing this gives

them the same ground as the sheet.)

(4) Remove the optical pickup block

(5) Perform work on top of the conductive sheet. Be careful not to

let your clothes or any other static sources to touch the unit.

* Grounding the Human Body, use an antistatic wrist strap to discharge static electricity from your body.

* Grounding the work place, use either an antistatic matt or a

sheet of steel on the area where the optical pickup is to be placed and ground the matt/sheet.

Fig. 1-3

(6) Short the short terminal on the PCB, which is in-side the

Pickup Assembly, before replacing the Pickup. (The short terminal is shorted when the Pickup Assembly is being lifted or moved.)

(7) After replacing the Pickup, open the short terminal on the

PCB.

DVD

DTH4500

First issue 12 / 00 3

ADJUSTMENT PROCEDURES

2. Pickup Disassembly and Assembly

2-1 Disassembly

1) Remove the power cable.

2) Switch SW3 (on Deck PCB) to "OFF" before disconnecting the flat cable (DCN1 inserted into Main PCB see Fig. 1-4).

3) Remove the deck.

4) Remove the deck PCB.

2-2 Assembly

1) Replace the Pickup.

2) Refit the deck PCB.

3) Refit the deck.

4) Insert flat cable into DCN1 (Main PCB) and switch SW3 (on deck PCB) to "ON". (see Fig. 1-4)

Note : If the assembly and disassembly are not done in correct sequence, the Pickup may be damaged.

Fig. 1-4

3. Disassembly and Assembly

3-1 Cabinet and PCB

Note : Reassemble in reverse order.

3-1-1 Removing the Top Cabinet

1) Remove 3 screws 1 on the back of the Top Cabinet.

2) Remove the 2 screws 2 on the left side and 3 on the right

side.

3) Lift the Top Cabinet up in the direction of the arrow.

Fig. 3-1-1

3-1-2 Removing the Door-Tray

1) Switch the power on and open Tray 1.

2) Pull Door-Tray 2 in direction of arrow "A".

3) Close Tray 1 and Switch the power off.

Note : If Tray 1 cannot be opened, insert a Screw driver 4 into Emergency hole 3 (as shown in detailed drawing) and then turn it in the direction of arrow "B". Open the Tray manually.

Fig. 3-1-2

FLAT-CABLE

TO MAIN PCB

(DCN1)

SW3

OFF

1 3 SCREWS

2 1 SCREW

3 1 SCREW

"A"

TRAY

DOOR-TRAY

EMERGENCY HOLE

SCREW DRIVER

"B"

DVD DTH4500

4 First issue 12 / 00

3-1-3 Removing the Front-Panel Assembly and Key

PCB

1) Remove Knob-Volume 1 and Knob-Shuttle 2

2) Remove Front-Panel Assembly 3.

3) Remove 5 screws 4 and Ground Rear 5.

4) Remove Key PCB 6.

Fig. 3-1-3

3-1-4 Removing the Deck Assembly

1) Remove 4 Screws 1 from the Assembly Deck and lift it up.

CAUTION :

a) When disassembling, switch SW3 to "OFF" on the Deck PCB and remove the Flat-Cable connected to DCN1 on Main

PCB.

b) When assembling, insert the Flat-Cable into the DCN1 on

Main PCB and switch SW3 to "ON" on the Deck PCB.

Fig. 3-1-4

3-1-5 Removing Main PCB and Jack PCB

1) Remove 1 Screw 1.

2) Remove 2 screws 2 and lift Jack PCB 3 up.

3) Remove 3 screws 4 and lift Main PCB 5 up.

Fig. 3-1-5

3-2 PCB Location

Fig. 3-2

DECK-ASS'Y

1 3 SCREWS

DCN1

MAIN PCB

SW3

OFF

FLAT-CABLE

1 SCREW

MAIN PCB

3 SCREWS

2 SCREWS

JACK PCB

MAIN PCB

KEY PCB

JACK PCB

5 SCREWS

KEY PCB

GROUND REAR

ASS'Y FRONT-CABINET

KNOB-VOLUME

KNOB-SHUTTLE

3-3 Deck

3-3-1 Removing PCB Deck Assembly, P/U Deck

1) Remove the soldering of SLED+, SLED- 1 and TM+, TM- 2.

2) Disconnect CN3 3, CN2 4.

3) Remove 1 Screw 5 and lift the PCB Deck 6 up.

4) Remove 1 Screw 7.

5) Push the Hook 8 in the direction of arrow "A" and lift the

P/U Deck Assembly 9 up in the direction of arrow "B".

Fig. 3-3-1

3-3-2 Removing the Tray Disc

1) Insert Screw Driver 1 into Emergency Hole 2 and push Sider

Housing 3 in the direction of arrow "A".

2) When Tray Disc 4 comes out little, pull it in the direction of

arrow "B" by hand.

3) Pull Tray Disc 4 to disassemble, while pushing 2 Stoppers 5

(left, right) in the direction of arrow "C" and "D" simultaneously.

Fig. 3-3-2

3-3-3 Removing Slider Housing

1) Push Slider Housing 1 in the direction of arrow "A".

2) Lift Slider Housing 2 up.

Fig. 3-3-3

3-3-4 Removing Housing Assembly

1) Remove Belt 1 and 1 Screw 2.

2) Remove 1 screw 3 and lift the Pulley Gear 4 up.

3) Push Hook 5 in the direction of arrow "A" and lift the Gear Tray 6 and the Gear Housing 7 up.

4) Push the 4 Hooks 8 bottom side in the direction of arrow "B" and lift the Motor Load Assembly 9 up.

5) Remove Clamper Assembly J.

Fig. 3-3-4

DVD

DTH4500

First issue 12 / 00 5

"A"

SLIDER HOUSING

Assembly

PUSH

BELT

1 SCREW

PULLEY GEAR

HOOK

"A"

GEAR TRAY

GEAR HOUSING

MOTOR LOAD ASS'Y

CLAMPER ASS'Y

4 HOOKS

"B"

SLED+/SLED-

TM+/TM-

1 SCREW

DECK PCB

1 SCREW

HOOK

"B"

"A"

ASS'Y P/U DECK

CN3

CN2

5 STOPPER

4 TRAY DISC

3 SLIDER HOUSING

5 STOPPER

2 EMERGENCY HOLE

1 SCREW DRIVER

"B"

"A"

"C"

"D"

3-3-5 Removing Sub Chassis

1) Remove 4 Screws 1.

2) Lift Assembly Braket Deck 2 up.

Fig. 3-3-5

3-4 Connector Diagram

3-3-6 Removing Bracket Deck

1) Remove Washer 1.

2) Remove Gear Feed B 2, Gear Feed A 3.

3) Remove 2 Screws 4.

4) Remove Shaft Pick-up 5 and Pick-up Assembly 6.

5) Remove screw 7.

6) Remove 2 screws 8.

7) Remove 3 Springs Spindle 9 and Motor Spindle Assembly J.

Fig. 3-3-6

DVD DTH4500

6 First issue 12 / 00

DECK-ASS'Y

CT3

KEY PCB

CT1

MAIN PCB

JACK PCB

CT2

CT4

NO. CONNECTOR NO. DIRECTION CONNECTOR NO. NO.

FCN1 KEY PCB JACK PCB CON5

PCNS1 JACK PCB MAIN PCB PCN1

FPC DECK-ASS'Y MAIN

PCB DCN1

CN1 JACK PCB MAIN PCB CN8

CT1 CT2 CT3 CT4

2 SCREW

WASHER GEAR FEED B

2 SCREWS

1 SCREW

SHAFT PICK-UP

GEAR FEED A

PICK-UP ASS'Y

SPRING SPINDLE

MOTOR SPINDLE

4 SC REWS

ASSY-BRAK DECK

DVD DTH4500

First issue 12 / 00 7

GENERAL BLOCK DIAGRAM - SYNOPTIQUE GÉNÉRAL - BLOCKSCHALTBILD ALLGEMEIN - SCHEMA A BLOCCHI GENERALE - ESQUEMA DE BLOQUES GENERAL

DECK ASS'Y (DP-5)

SIC3

(KA3017)

Actuator & Motor Driver

Spindle/Sied/Tray Motor Pick-up & I/V Amp

DIC2 4M DRAM

ZIC2/3 SDRAM X 2

MIC4 2K EEPROM

Remote Control FLT Display

MIC2 8M EPROM

Coaxial

SIC1

(KS1454)

Servo + DSP

RIC1

(KS1462)

RF Amp & DPD

MIC1

(TMP95C265F)

Main Controller

FIC1

AC3 DECODER

(uPD780232)

Front Controller

ZIC1 (ZiVA-4.1)

A/V Decoder

Post Filter

Optical

A/V

Decoder

AC3 &

MPEG 5.1

Video

Encoder

(4DAC)

AUDIO

DSP

CSS

INPUT

FIFO

DEMUX

AIC1 (AK4393)

2-CH Audio DAC

Down-L/R

MIC3 1M SDRAM

SCIC3

(14053)

Switch

SCIC4

(NJM2267)

AMP

SCIC5

(14053)

Switch

SCIC6

(BA7660)

AMP

SCIC1, 2

(14053)

Switch

SCJ1 (VCR)

SCJ1 (TV)

RGB_DVD

CVBS_DVD

COMP

Y/B/Pb

L/R_DVD

CVBS_TV_IN

CVBS_TV_OUT

L/R_TV

RGB_TV

CVBS_VCR

_IN

CVBS_VCR_IN

RGB_VCR

L/R_VCR

Post Filter

Yout Cout

CVBS

Post Filter

VIC1 (BA7660)

6dB AMP

F/L

F/R

R/L

R/R

S/W

C/T

+ 22 hidden pages

Thomson DTH-4500 Service manual

DTH4500

CONTENTS

TECHNICAL SPECIFICATIONS

ADJUSTMENT PROCEDURES