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