1-26 (No.MA074)
5.5 Signal processing section
No sound from either
channel.
Is 9V present at IC161 pin
31?
Compare the L-ch and
R-ch to locate the
defctive point.
Is the sound output from
both channels (L, R)?
Check the viciniyt of the
IC901 audio power
supply.
NO
NONO
NO
YES
YES
YES
YES
YES
Check IC581 and its
peripheral circuits.
Is the audio signal
(including sampling output
components) output to
IC581 pins 1 and 7 during
playback?
Is the audio signal output
at IC161 pins16 and 17
during playback?
NO
Check IC161 and its
peripheral circuits.
Check the muting circuit.
Normal
w
w
w
.
x
i
a
o
y
u
1
6
3
.
c
o
m
Q
Q
3
7
6
3
1
5
1
5
0
9
9
2
8
9
4
2
9
8
T
E
L
1
3
9
4
2
2
9
6
5
1
3
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
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