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Flow Chart of Troubleshooting
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9-11

9-5. Microphone Part
Check the assembled status
of microphone.
Check the circuit
from U400 to MIC
Reassemblage microphone
Resolder the C409, C410, R407, R408
END
No
Yes
Yes
Yes
No
Microphone does not work
Check U400 PIN 4
='H'? Check the JACK_EN signal
No
Check the MIC
Yes
Yes
Replace the MIC
No
①