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Flow Chart of Troubleshooting
10-9
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10-1-5. Microphone Part
①
Flow chart of Microphone Part
Micro-phone does not work
Reassemble MAIN KEY FPCB
Check the DC bias voltage on Mic path.
Check the path around MIC
Bias circuit
Check UCP300
END
NO
YES
Is the assembled
status of
Microphone O.K?
The voltage of R503
is
about 1.8V ?
NO
The microphone is OK
NO
YES
YES
YES
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