Front Circuit(Dogotrpm & Key) - Sony DVP-FX700 Service Manual

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3. Front Circuit(Dogotrpm & Key)
START
Power on.
LED ON?
YES
Is Digitron on normally?
YES
Do all the
buttons work
normally?
YES
Check waveform of
TE
L 13942296513
Check
-R701~706, R728~R736, R743, R738
-R551~R558
Does remote control
work normally?
YES
Complete repairing Front B/D.
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.
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NO
NO
NO Check waveform of
IC701 Pin52, 54, 55, 56?
YES
- Check and Replace C704,
R709, R710, R711
- Solder defective parts again
T701
NO
NO
IC701 Pin 46,47.
YES
Check and Replace
Q701, Q501.
and replace
NO Does pulse NO
waveform of RC901 Pin 1
appear?
YES
Is IC701
Pin 49 connected to
RC901 Pin 1 ?
YES
Replace IC701.
YES
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8
when power S/W turn on,
Is oscillation of X704
normal?
YES
Check waveform
of IC701 Pin 67.
YES
Check and Replace
IC 2M5
Check the connection
of CON901, CON701.
YES
Q Q
3 6 7 1 3
NO
Check waveform
of IC701 Pin 59.
YES Replace IC701.
Replace LED903 .
NO
Is RC901 Pin 2 5V?
Solder defective parts
YES
Replace RC901.
YES
Re-solder.
YES
u163
.
9-5
2 9 9 4 2 8
NO
Check Power.
NO
Replace IC702.
NO
NO
Check waveform
of IC701 Pin 46,47.
YES
Solder Key part.
Replace IC701.
1 5 0 5 8 2 9 9 4
Recheck
m
co
9 9
2 8 9 9