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Flow Chart of Troubleshooting
10-7
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10-1-4. Microphone Part
Microphone does not work
Yes
Is the assembled status of
microphone O.K?
Yes
No
Reassembled the microphone
Check the reference voltage on mic path
Yes
VR400
≒
2.0V ?
Yes
Is microphone ok?
Yes
END
No
No
Resolder or change
R409,C408,C410,C411,R412,R414,
TA409,R101,C403,R404,C402,R405
Check
UCD300
②
①