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Flow Chart of Troubleshooting
9-9
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9-1-5. Microphone Part
Micro-phone does not work
Is the assembled status of
Microphone O.K?
Reassemble MAIN KEY FPCB
Check the DC bias voltage on Mic path.
Check the path around MIC
Bias circuit
The microphone is OK
Check UCP300
END
NO
YES
NO
NO
YES
YES
YES
The voltage of R501 is
about 1.3V ?