Used
ICs: TDA884x – SDA 55xx – TDA4605 - TDA8351 or TDA8356 – TDA6107 or TDA6108 –
MSP3405C or MSP3415G – U4468B or TDA4445B – TDA7057A
SERVICE
MODE
All other service settings of TV set are made in so called service
mode of TV set operation.
To enter this mode of operation press the keys in the following sequence: "TV", "I", and "STOP" within 5 seconds from switching on the TV set to normal mode of operation.
When the TV set is switched over to service mode the following status line with service parameter and parameter value appears on the screen:
To enter this mode of operation press the keys in the following sequence: "TV", "I", and "STOP" within 5 seconds from switching on the TV set to normal mode of operation.
When the TV set is switched over to service mode the following status line with service parameter and parameter value appears on the screen:
The parameter to be set is selected with keys (P+/P-), and
selected parameter is set with keys (volume+ /volume-). Each time you press the
key for parameter selection (UP/DN ) the value of pre-selected parameter is
stored. Therefore when the last setting is performed you must press one of the
two keys once again. Values of individual parameters are expressed in
hexadecimal form due to limited capacity of the memory. Values of individual parameters are variable
from 0 to 3F, with the exception of some parameters where values are changed
from 0 to 7F and O1, O2, O3, O4, O5 which have value range between 0 and FF.
When setting is finished it should obligatory be concluded with "STOP" key. After a few seconds the status line disappears and service adjustment is accomplished.
When setting is finished it should obligatory be concluded with "STOP" key. After a few seconds the status line disappears and service adjustment is accomplished.
LIST OF SERVICE MODE PARAMETERS
COMPONENT LOCATION AND MEASURING POINTS
FOR SUPPLY VOLTAGES ON MAIN CHASSIS – COMPONENT SIDE
FATAL ERROR DETECTION: [VIDEO PROCESSOR NOT
DETECTED, or POWER UP RESET of Video Processor not finished – LED flashing with 1Hz.]
TDA8843 PIN DESCRIPTION
SDA553 and 24C16 PIN DESCRIPTION
MSP3411G (MSP3401G – MSP3405G –
MSP3415G) PIN DESCRIPTION
CIRCUIT DIAGRAM
CLICK ON THE PICTURES TO MAGNIFY
DEMAGNETIZING OF PICTURE TUBE
Correctness of picture tube demagnetizing is usually automatically checked. Magnetization of picture tube is presented as one or more color "clouds", consequently color reproduction of the picture is not correct. Each time the TV set is switched on with mains switch, demagnetizing system is activated. For correct demagnetizing procedure disconnect the TV set with mains switch and leave it disconnected for about 15 minutes. Afterwards when you switch on the TV, demagnetizing procedure is performed. In case distortion of color reproduction still persists, special demagnetizing coil should be used.
Correctness of picture tube demagnetizing is usually automatically checked. Magnetization of picture tube is presented as one or more color "clouds", consequently color reproduction of the picture is not correct. Each time the TV set is switched on with mains switch, demagnetizing system is activated. For correct demagnetizing procedure disconnect the TV set with mains switch and leave it disconnected for about 15 minutes. Afterwards when you switch on the TV, demagnetizing procedure is performed. In case distortion of color reproduction still persists, special demagnetizing coil should be used.
