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1-7
Distorted audio and loud noise
Distorted audio and loud noise Yes
Trouble shooting chart
Check the power supply voltages +12VA
No
Check whether the output of the power board is normal.If abnormal ,change the power board
Yes
Check whether R79 and R80 are normal
No Replace R79 and R80
Yes
Check muting
whether
the
No Replace Q9,Q11
transistor
Q9,Q11 are normal
Yes
Checking the U5 leads the feet has no to break to open
No
Yes
No
Check whether the U1 or U15 powersupply normal
Check U15
Yes
Replace U2 or U15
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