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Flow Chart of Troubleshooting
7-6
5. Microphone Part
Is the assembled status of
microphone O.K?
Microphone does not work
C423 > 2.5V
Reassemble the microphone
Solder the microphone again or
Replace around Mic Circuit
(C412, C420, R415, R418.....)
END
No
Yes
Yes
Yes
Yes
No
Is microphone ok ?
No
Check U100
Check the reference voltage on Mic path
