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Flow Chart of Troubleshooting
9-21
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9-1-7 : Abnormal Voice Call operation
No sound on calling
C635 Both side
output exist?
NO
Check U603 or MICBIAS
Voltage, neighboring
circuit
YES
Is MIC
OK?
NO
Check U601, U602
and neighboring circuit
YES
PCM CLK, SYNC,
DOUT output=exist?
NO
Check U602
YES
END
C652, C653
output=exist ?
YES
Resolder
or Replace MIC Fpcb
Is Receiver
OK?
YES
Check Fpcb or Resolder
Receiver, Replace
Receiver
NO
NO
