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Flow Chart of Troubleshooting
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10-
12
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 C514 is
about 2.9V±10%?
NO
Solder the microphone again
or Replace
R513,R511,R518,C514,C503,
C509,C510,R500,R502,C501,
R509,R506,C506
Is microphone OK?
NO
Check U402.
END
YES
YES