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ELECTRICAL TROUBLESHOOTING GUIDE
POT. IN
IC202
Pin21,22 POT. IN input signal
OK?
YES
IC202
Pin42,43,44 I2S input signal
OK?
YES
IC202
Pin41 ADC data output signal
OK?
YES
A
TUNER
IC202
Pin23,24 TUNER_L/R input
signal OK?
YES
IC202
Pin42,43,44 I2S input
signal OK?
YES
IC202
Pin41 ADC data output
signal OK?
YES
A
NO
Check MIC board.
NO
NO
TU101
NO
TUNER_L/R output
signal OK?
NO
Check IC501.
NO
Replace IC202.
3-39
Check IC501.
Replace IC202.
NO
YES
Check +3.3 V of TU101.
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