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Flow Chart of Troubleshooting
3-1-4. Microphone Part
Microphone does not work
Is the assembled status of
Check the reference voltage on mic path
Yes
microphone O.K?
Yes
Yes
VR400 ≒ 2.0V ?
Yes
Is microphone ok?
Yes
END
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No
Reassembled the microphone
Resolder or change
No
R415,R417,C412,C411,C414,C415
R425,R421,R423,R420,R424
No
Check
UCP300
3-8
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