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Flow Chart of Troubleshooting
10-1-5. Microphone Part
Micro-phone does not work
Is the assembled status of
Microphone O.K?
Check the DC bias voltage on
Mic path.
The voltage of C442 is
about 2.2V±10%?
Is microphone OK?
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YES
YES
YES
END
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NO
Reassemble the microphone
Solder the microphone again
NO
C442, R424, R422, R423
NO
10-12
or Replace
Check U102
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