4. TROUBLE SHOOTING
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4.18.4 Main Microphone
MIC Signal : MIC500
→
C3, C4(TP)
→
MIC1P of MSM77T
MIC Bias : HIC_BIAS
→
C58(TP1)
→
MIC500
MIC_Bias(C58(TP1)) is about 1.8V?
No
START
Change the main PCB
Make a call
Yes
The sine wave appears at
C3(TP)?
No
Change the MIC
Make a sound (Sine wave) to MIC
Yes
Change the MSM77T or
Change the main PCB
Yes
Work well?
END
No