Aiwa HT-DV2300 Service Manual page 63

ELECTRICAL TROUBLESHOOTING GUIDE -6/10
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3 7 63 1515 0
4. Front Circuit (Digitron & key)
START
Power on.
LED ON?
YES
Is Digitron on normally?
YES
Do all the
buttons work
normally?
YES
TE
L 13942296513
Does remote control
work normally?
YES
Complete repairing Front B/D.
www
.
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NO
Is oscillation of
X901 normal?
NO
Check waveform
of IC901 Pin 7.
CD
NO
Is waveform of IC901
Pin 20 normal?
NO
Check waveform of
IC901 Pin 14, 15.
YES
Solder defective parts again.
Check and replace
R926, R925.
NO Does pulse
waveform of RC901 Pin 1
appear?
YES
Is IC901
Pin 28 connected to
RC901 Pin 1 ?
YES
Replace IC901.
YES
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2 9
8
NO
YES
NO
YES
NO
YES
Q Q
3 6 7 1 3 1 5
NO
Is RC901 Pin 2 5V?
YES
Replace RC901.
YES
Re-solder.
YES
co
.
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9 4 2 8
Check Power.
Replace IC902.
NO
Check waveform
of IC901 Pin 15.
YES
Solder Key part.
0 5 8 2 9 9 4
Replace IC901.
Check waveform NO
of IC901 Pin 18, 19.
YES Replace IC901.
Replace LED901.
NO
Solder defective parts
m
9 9
2 8 9 9
Recheck