Samsung SGH-A737 Service Manual page 43

Flow Chart of Troubleshooting
9-1-5. Microphone Part
Micro-phone does not work
Is the assembled status of
NO
Reassemble MAIN KEY FPCB
Microphone O.K?
YES
Check the DC bias voltage on Mic path.
YES
The voltage of R500 is
Check the path around MIC
NO
about 1.3V ?
Bias circuit
YES
NO
The microphone is OK Check UCP300
YES
END
9-9
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