XOCECO LC-20Y15, Service Manual

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3
Alignment instruction
1 Alignment equipment
PM5518 (video signal generator)
K-7253 (VGA signal generator)
CA210 (white balancer)
IF signal generator
Signal generator
Oscillograph
2 Alignment flow-chart
The alignment flow-chart is shown as fig-1
Fig-1 adjustment flow-chart
3 Unit adjustments
3.1 Flash writing programs
Written memory N300 and N400.
3.2 Check power supply board
Turn off between power supply board and main board, after plug in power, testing X702 (pin1 and
pin5) power supply board voltage to be 12v and 5v.
3.3 main board adjustment
3.3.1 IF amplifier adjustment
a. Turn off the J201, J202, J203, J204, J205 and J5, input 38MHz(PAL SYSTEM) and 45.75MHz(N
Write memory N300 and N400
To produce main board and power supply board
Check power supply board and main adjustment
All testing
Connect with central signal source, then check each function of TV(Station
missing, system identification, analog control etc.) , check the output of speaker
Input AV/S-video signal, then check each function of AV/S-video
Input YPrPb signal and see if the display is normal under PC status
and check various functions (analog control), line/field center etc.
Check the accessories and pack them in box