(No.49780B)1-27
5.5 Signal processing section
No sound from either
channel.
Compare the L-ch and R-ch
to locate the defective point.
Check the vicinity of the
Q981 audio power supply.
Check IC521 and its
peripheral circuits
Check IC101 and its
peripheral circuits
Is 9V present at IC101 pin
(8)?
Is the sound output from
both channels (L, R)?
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
Is the audio signal
(including sampling output
components) output to
IC521 pins ^and | during
Is the audio signal output
at IC101 pins 1
and7during playback?
Check the muting circuit.
Normal
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