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Signal processing section
Is the sound output from
both channels (L, R)?
YES
Normal
1‑25
NO
No sound from either
channel.
YES
Is 9V present at IC101 pin
(8)?
YES
Is the audio signal
(including sampling output
components) output to
IC521 pins ^and | during
YES
Is the audio signal output
at IC101 pins 1
and7during playback?
YES
Check the muting circuit.
NO
Compare the L-ch and
R-ch to locate the
defective point.
NO
Check the vicinity of the
Q981 audio power
supply.
NO
Check IC521 and its
peripheral circuits.
NO
Check IC101 and its
peripheral circuits
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