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5.5 Signal processing section 3 7 63 1515 0
Is the sound output from
both channels (L, R)?
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NO
YES
Normal
Is 9V present at IC161
pin 32?
Is the audio signal
(including sampling
output components)
output to IC581 pins 1
and 7 during playback?
Is the audio signal
output at IC161 pins 15
and 18 during playback?
Check the power amp.
IC301.
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2 9
8
NO
No sound from either
channel.
YES
NO
YES
NO
YES
NO
YES
Q Q
3 6 7 1 3
.
9 4 2 8
Compare the L-ch and
R-ch to locate the
defective point.
Check the vicinity of the
IC901 audio power
supply.
Check IC581 and its
peripheral circuits.
Check IC161 and its
peripheral circuits.
1 5 0 5 8 2 9 9 4
m
co
9 9
2 8 9 9
(No.MA166)1-27