4. TROUBLE SHOOTING
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4.11.3 Main MIC troubleshooting
Main MIC signal is generated by MEMS MIC on RF-key PCB
Check the MIC hole to
make clear the voice signal path.
Is vioce signal OK?
END
Yes
No
Change the mainboard
Change the RF-key PCB.
And check the voice siganl.
Is voice signal OK?
(TP1)
END
Yes
No
Change the TWL6040(U803)
Is the voice siganl OK?
(TP2)
END
Yes
No
START
Check the MIC signal by loop-back test
or voice recorder