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Flow Chart of Troubleshooting
3-8
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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
R121,R122,R116,
C134,C141,C148,C152
END
No
Yes
Yes
Yes
Yes
No
Is microphone ok?
No
Chec
k
U100
Check the reference voltage on mic path
K13
≒
2.8V ?
Yes
①
②