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3. Front Circuit(Dogotrpm & Key)
START
Power on.
NO
LED ON?
YES
NO
Is Digitron on normally?
YES
- Check and Replace C704,
R709, R710, R711
- Solder defective parts again
T701
Do all the
NO
buttons work
normally?
YES
Check waveform of
IC701 Pin 46,47.
YES
Check
and replace
-R701~706, R728~R736, R743, R738
-R551~R558
NO
Does remote control
waveform of RC901 Pin 1
work normally?
YES
Complete repairing Front B/D.
NO
Check waveform of
IC701 Pin52, 54, 55, 56?
YES
Check and Replace
IC 2M5
NO
Check and Replace
Q701, Q501.
NO
Does pulse
Is RC901 Pin 2 5V?
appear?
YES
Is IC701
Pin 49 connected to
Replace RC901.
RC901 Pin 1 ?
YES
Replace IC701.
YES
NO
when power S/W turn on,
Is oscillation of X704
normal?
YES
NO
Check waveform
of IC701
Pin 67.
YES
NO
Check the connection
of CON901, CON701.
YES
NO
Check waveform
of IC701 Pin 59.
YES
Replace IC701.
Replace LED903 .
NO
Solder defective parts
YES
YES
Re-solder.
YES
3-21
Check Power.
Replace IC702.
NO
Check waveform
of IC701 Pin 46,47.
YES
Solder Key part.
Replace IC701.
Recheck
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