Aiwa XD-DV370 Service Manual page 78

ELECTRICAL TROUBLESHOOTING GUIDE -6/11
4. Front Circuit (Digitron & key)
START
Power on.
LED ON?
YES
Is Digitron on normally?
YES
Do all the
buttons work
normally?
YES
Does remote control
work normally?
YES
Complete repairing Front B/D.
NO
NO
Check waveform
CD
NO
Is waveform of IC901
Check waveform of
IC901 Pin 13.
YES
Solder defective parts again.
Check and replace
R903,R912, R904, R905,
R941, R906, R907.
NO Does pulse
waveform of RC901 Pin 1
appear?
Is IC901
Pin 24 connected to
RC901 Pin 1 ?
Replace IC901.
Is oscillation of
X901 normal?
YES
of IC901 Pin 6.
YES
Pin 76 normal?
YES
NO
NO
Is RC901 Pin 2 5V?
YES
YES
YES
-78-
NO
Check Power.
NO
Replace IC902.
NO
Check waveform
of IC901 Pin 13.
YES
Replace IC901.
Check waveform
of IC901 Pin 2.
YES
Replace LED901.
NO
YES
Replace RC901.
YES
Re-solder.
YES
NO
Solder Key part.
NO
Replace Q901.
Solder defective parts
Recheck