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5.5 Signal processing section 3 7 63 1515 0
Is the sound output from
both channels (L, R)?
Normal
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L 13942296513
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1-26 (No.MA110)
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NO
No sound from either
channel.
YES
Is 9V present at IC161 pin
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 3 and 30
during playback?
Check the muting circuit.
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8
NO
Compare the L-ch and
YES
NO
Check the viciniyt of the
31?
IC901 audio power
YES
NO
Check IC581 and its
peripheral circuits.
YES
NO
Check IC161 and its
peripheral circuits.
YES
Q Q
3 6 7 1 3
u163
.
2 9 9 4 2 8
R-ch to locate the
defctive point.
supply.
1 5 0 5 8 2 9 9 4
m
co
9 9
2 8 9 9