THOMSON MCR61TF30 Bedienungsanleitung

FILE NO. SM-CTV-O-039A

COLOR TELEVISION

SERVICE MANUAL

MODEL NO. MCR61TF30/MCR66R400

MCR68R420/MCR68TF800

CHASSIS NO. CH-10C5

Please read this manual carefully before service.

A-PDF MERGER DEMO

SERVICE MANUAL

TABLE OF CONTENTS

SAFETY INSTRUCTIONS AND MAINTENANCE........................................................... 1

X-Ray Radiation Precaution......................................................................................... 1

Safety Precaution......................................................................................................... 1

Product Safety Notice .................................................................................................. 2

Maintenance ................................................................................................................ 2

KEY ICS AND ASSEMBLIES ......................................................................................... 3

BLOCK DIAGRAMS FOR CHASSIS .............................................................................. 4

Structure Block Diagram .............................................................................................. 4

Block Diagram for Supply Voltage System................................................................... 5

Block Diagram for Remote Control Structrre................................................................ 6

Block Diagram for Video Signal Processor .................................................................. 7

SERVICE DATA .............................................................................................................................8

Technical Data of Key ICs ............................................................................................ 8

Service Data of Key ICs............................................................................................. 22

Waveforms of Key Points ........................................................................................... 28

ADJUSTMENTS............................................................................................................ 32

Set-up Adjustments.................................................................................................... 32

Circuit Adjustments .................................................................................................... 34

Service Mode and Bus Data ...................................................................................... 36

APPENDIX

1. Circuit Diagram

2. Final Wiring Diagram

3. Exploded View

4. Printed Circuit Board Diagrams

SERVICE MANUAL

SAFETY INSTRUCTIONS AND MAINTENANCE

WARNING: BEFORE SERVICING THIS CHASSIS, READ THE X-RAY RADIATION PRECAUTION ,

SAFETY PRECAUTION AND PRODUCT SAFETY NOTICE INSTRUCTIONS-BELOW.

X-RAY RADIATION PRECAUTION

1. The EHT must be checked every time the receiver is serviced to ensure that the CRT does not emit

X-ray radiation as result of excessive EHT voltage. The nominal EHT for this receiver is 29KV (for

25”TV) or 30KV (for 29”TV) at zero beam current (minimum brightness) operating at AC 120V. The

maximum EHT voltage permissible in any operating circumstances must not exceed 32KV (for

25”TV) or 33KV (for 29”TV). When checking the EHT, use the High Voltage Check procedure in this

manual using an accurate EHT voltmeter.

2. The only source of X-RAY radiation in this receiver is the CRT. To prevent X-ray radiation, the

replacement CRT must be identical to the original fitted as specified in the Parts List.

3. Some components used in this receiver have safety related characteristics preventing the CRT

from emitting X-ray radiation. For continued safety, replacement component should be made after

referring the PRODUCT SAFETY NOTICE below.

SAFETY PRECAUTION

1. The receiver has a nominal working EHT voltage of 29KV (for 25”TV) or 30KV (for 29”TV). Extreme

caution should be exercised when working on the receiver with the back removed.

1) Do not attempt to service this receiver if you are not conversant with the precautions and procedures

for working on high voltage equipment.

2) When handling or working on the CRT, always discharge the anode to the receiver chassis before

removing the anode cap in case of electric shock.

3) The CRT, if broken, will violently expel glass fragments. Use shatterproof goggles and take extreme

care while handling.

4) Do not hold the CRT by the neck as this is a very dangerous practice.

2. It is essential that to maintain the safety of the customer all power cord forms be replaced exactly

as supplied from factory.

3. Voltage exists between the hot and cold ground when the TV is in operation. Install a separation

transformer during repairing or connecting to any testing equipment for the sake of safety. The

power of the separation transformer should exceed the rated overall power.

4. Replace blown fuses within the receiver with the fuse specified in the parts list.

5. When replacing wires or components to terminals or tags, wind the leads around the terminal

before soldering. When replacing safety components identified by the international hazard symbols

on the circuit diagram and parts list, it must be the company-approved type and must be mounted

as the original.

6. Keep wires away from high temperature components.

SERVICE MANUAL

PRODUCT SAFETY NOTICE

Many electrical and mechanical components in this chassis have special safety-related characteristics.

These characteristics are often passed unnoticed by a visual inspection and the X-ray radiation

protection afforded by them cannot necessarily be obtained by using replacements rated at higher

voltages or wattage, etc. Components which have these special safety characteristics in this manual

and its supplements are identified by the international hazard symbols in the circuit diagram and parts

list. Before replacing any of these components read the parts list in this manual carefully. Substitute

replacement components which do not have the same safety characteristics as specified in the parts

list may create X-ray radiation.

Safety Symbol Description

The lightning symbol in the triangle tells you that the voltage inside this product may be

strong enough to cause an electric shock. Extreme caution should be exercised when

working on the TV with the back removed.

This is an international hazard symbol, telling you that the components identified by the

symbol have special safety-related characteristics.

FDA This symbol tells you that the critical components identified by the FDA marking have

special safety-related characteristics.

UL This symbol tells you that the critical components identified by the UL marking have special

safety-related characteristics.

VDE This symbol tells you that the critical components identified by the VDE marking have

special safety-related characteristics.

Maintenance

1. Place the TV set on a stable stand or base that is of adequate size and strength to prevent it from

being accidentally tipped over, pushed off, or pulled off. Do not place the set near or over a radiator

or heat register, or where it is exposed to direct sunlight.

2. Do not install the TV set in a place exposed to rain, water, excessive dust, mechanical vibrations or

impacts.

3. Allow enough space (at least 10cm) between the TV and wall or enclosures for proper ventilation.

4. Slots and openings in the cabinet should never be blocked by clothes or other objects.

5. Please power off the TV set and disconnect it from the wall immediately if any abnormal condition

are met, such as bad smell, belching smoke, sparkling, abnormal sound, no picture/sound/raster.

Hold the plug firmly when disconnecting the power cord.

6. Unplug the TV set from the wall outlet before cleaning or polishing it. Use a dry soft cloth for

cleaning the exterior of the TV set or CRT screen. Do not use liquid cleaners or aerosol cleaners.

SERVICE MANUAL

KEY ICS AND ASSEMBLIES

Table 1 Key ICs and Assemblies

Serial No. Position No. Model No. Function Description

1 N301 OM8839PS Small signal processor

2 N401 TDA8350Q Vertical output circuit

3 N852 LM317T Tri-terminal regulator

4 N601 TDA7057AQ Sound power amplifier

5 N001 LC86F3264AU-DIP Microcontroller

6 N002 AT24C04/AT24C08 EEPROM

7 NY01 TDA6107Q Video amplifier

8 DS01 HEF4053 Analog switch circuit

9 DS02 HEF4053 Analog switch circuit

10 N606 TDA9859 Audio processor

11 A101 TDQ-6F2M Tuner

Notes: AT24C04 (N002) is for MCR61TF30 only;

AT24C08 (N002) is for MCR66R400/MCR68R420/MCR68R800.

SERVICE MANUAL

BLOCK DIAGRAMS FOR CHASSIS

Structure Block Diagram

SERVICE MANUAL

Block Diagram for Supply Voltage System

Fig.2 Block Diagram for CH-10C1(S) Supply Voltage System

SERVICE MANUAL

Black Diagram for Remote Control Structure

SERVICE MANUAL

Block Diagram for Video Signal Processor

SERVICE MANUAL

SERVICE DATA

Technical Data of Key ICs

LC86F3264AU-DIP (N001)

1. Terminal Assignment Layouts

Fig. 5 LC86F3264AU-DIP DIP42S Terminal Assignment Layout

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