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Flow Chart of Troubleshooting
2-13
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3-1-5. 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 TA403
about 2.9V±10%?
NO
Solder the microphone again
or Replace
R400,R404,R406,C423,C424,
C425,R321,R323,R325,R326,
C329,C330,C331,C332
Is microphone OK?
NO
Check UCP301
END
YES
YES