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Distorted audio and loud noise
Check he power supply
voltages +12V
to the operation amplifying
L2 are normal
Check
muting transistors Q15,
Q16, are normal
Checking the U7 leads
the feet has no to break
to open
Distorted audio and
loud noise
Yes
Yes
whether
the
Yes
No
Yes
Check whether the U7
power supply
normal
Yes
Replace U7
5-5
No
Replace L2
No
Replace Q15, Q16
No
Correct connection
No
Check U7
Trouble shooting chart
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