3. TROUBLE SHOOTING
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3.8.4 SUB MIC troubleshooting
A sub MIC is located on Main PCB.
It operates in case of voice call (Speaker phone).
START
Check the MIC signal by
Speaker Loop back test
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
Is Speaker sound OK?
Change the WCD9320(U10000)
Is receiver Sound OK?
END
END
END
END
END
Change The main PCB
Check the MIC mesh filter, rubber.
Is voice signal ok?
Check the MIC hole to make clear the
voice signal path
Is voice signal ok?
Check the sub MIC.
Is voice signal ok?