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
iPod
IC202
Pin25,26 iPod input signal
OK?
YES
IC202
Pin42,43,44 I2S input signal
OK?
YES
IC202
Pin41 ADC data output
signal OK?
YES
A
NO
Check USB board.
NO
NO
IC203
NO
Pin4 USB_VBUS 5 V
OK?
NO
Check IC501.
NO
Replace IC202.
3-36
Check IC501.
Replace IC202.
NO
YES
Check USB_VBUS of IC203.