4-6
Distorted audio and loud noise
No
Yes
No
Yes
No
Distorted audio and
loud noise
Replace R8 and R14
Check Q2and Q3
Replace Q19,Q22
Check the power
supply voltages from
the R8 and R14 .
Yes
Check whether the
muting transistor
Q19,Q22, are normal
Checking the U13
leads short or open
Check whether the
U13 power supply
is normal
No
Yes
Check the power supply
vo12V and -12V to
the operation amplifying Q2
andQ3 are normal.
Yes
Replace U13
Trouble shooting chart
Re-soldering
Check the +12V,-12V
Yes
No