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Flow Chart of Troubleshooting
3-8
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3-1-4. Microphone Part
Is the assembled status of
Key FPCB O.K?
Microphone does not work
Reassemble the Key FPCB
resolder the trouble point
END
No
Yes
Yes
Yes
No
Is microphone ok?
No
Check
U301
is the Mic path component
soldering status OK?
Yes
Is the DC bias voltage on
Mic path at R601 2.85V?
check the path around MIC Bias Circuit
No
Yes