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Flow Chart of Troubleshooting
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9-
10
9-1-4. 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 TA404 is
about 2.2V±10%?
NO
Solder the microphone again
or Replace
TA404,C449,R424,R428,R429
Is microphone OK?
NO
Check U300
END
YES
YES