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Flow Chart of Troubleshooting
3-10
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3-1-4. Microphone Part
Is the assembled status of
microphone O.K?
Microphone does not work
Reassembled the microphone
Resolder or change
R411,R414,C413,C414,C418,C420
C421,R422,C415,C419,R416,R419
R415,R420
END
No
Yes
Yes
Yes
Yes
No
Is microphone ok?
No
Check
UCP301
Check the reference voltage on mic path
VR401
2.0V ?
Yes