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Trouble shooting chart
Distorted audio and loud noise
Distorted audio and loud noise Yes Check the power supply voltages +12V to the operation amplifying Q27 and -12V are normal. Yes
No Check Q27
Check whether the muting transistor R176 andR175 are normal Yes
No Replace R176 and R175
Check whether the muting transistor Q17,Q18, are normal Yes
No Replace Q17~Q18
Checking the U15 leads the feet has no to break to open Yes
No
Correct connection
Replace U1 No if the clock signal AOUT0, ABCK and ALRCK output by U1 are normal
SACLK waveform
SBCLK waveform
SSLRCK waveform
Yes
Check whether the U1 or U15 powersupply normal Yes
Replace U1 or U15
