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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.
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
1
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.
1
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.
2
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.
3
SERVICE MANUAL
BLOCK DIAGRAMS FOR CHASSIS
Structure Block Diagram
4
5
Block Diagram for Supply Voltage System
SERVICE MANUAL
Fig.2 Block Diagram for CH-10C1(S) Supply Voltage System
SERVICE MANUAL
Black Diagram for Remote Control Structure
6
SERVICE MANUAL
Block Diagram for Video Signal Processor
7
SERVICE MANUAL
SERVICE DATA
Technical Data of Key ICs
LC86F3264AU-DIP (N001)
1. Terminal Assignment Layouts
Fig. 5 LC86F3264AU-DIP DIP42S Terminal Assignment Layout
8
SERVICE MANUAL
2. Terminal Function
Table 2 Terminal Function Table
Terminal I/O Function Description Option Format
VSS - Negative power supply
XT1 1 Input terminal for crystal oscillation
XT2 O Output terminal for crystal oscillation
VDD - Positive power supply
RES I Reset terminal A
FILT O Charge-pump output terminal N
Image signal input terminal
CVIN I (available only in CH04T1002) M
VS I Vertical synchronization signal input terminal
A
HS I Horizontal synchronization signal input terminal
R O Red (R) output terminal of RGB image
G O Green (R) output terminal of RGB image
B O Blue (B) output terminal of RGB imagee O
I O Intensity (I) output terminal of RGB image
Fast blanking control signal
RL O Switch TV image and caption/OSD image signal
8-bit input/output port Pull-up resistor
Part 0 Input/output can be specified in nibble unit provided/not
Other functions: provided
I/O E
Hold release input Output format
P00-P07 Internal input CMOS/Nch-OD
Port 1 8-bit input/output port
Each bit can be independently programmable
Other functions:
P10 SIO0 data output
P11 SIO0 data input/bus input/output Output format
I/O P12 SIO0 clock input/output F
CMOS/Nch-OD
P10-P17 P13 PWM1 output
P14 PWM2 output
P15 PWM3 output
P17 Timer 1(PWM) output
4-bit input/output port
Each bit can be independently programmable
Other functions:
P60 IIC0 data input/output
Port 6 I/O P61 IIC0 clock output
P62 IIC1 data input/output
P63 IIC1 clock output
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SERVICE MANUAL
Terminal I/O Function Description Option Format
4-bit input/output port
Port 7 Each bit can be independently programmable
Other functions:
INTO input/HOLD release input
P70
/Nch-Tr. output for watchdog timer
P71 INT1 input/HOLD release input
P72 INT2 input/timer 0 event input
INT3 input (noise rejection filter attached P70
P73
input)/timer 0 event input W
I/O Interrupt receiver format vector address P71-P73
P71-P73 Rising
H L V
Rising Falling / Vector
Falling level level
INTO yes yes no yes yes 03H
INT1 yes yes no yes yes 0BH
INT2 yes yes yes no no 13H
INT3 yes yes yes no no 1BH
Port 8 1-bit input port
P83
(P83 is set only in CH04T1002)
B
I 4-bit input/output port(P84-P87)
P83
I/O Each bit can be independently programmable
P84-P87 P84-P87
Other function:
X
AD converter input port
Port options can be specified independently for each bit.
The programmable pull-up resistors are provided depending on whether CMOS or Nch-OD (Nch open
drain ) is selected as the port 1 option.
3. Refer to Table 3 about Functions and Data of the IC's Each Pin.
10
SERVICE MANUAL
EEPROM AT24C04 (N002)
1. Features 2. Pin Configuration
Data EEPROM internally organized as 512
bytes and 32 pages