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4. TROUBLE SHOOTING
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4.18 Main microphone
MIC901-> MICBIAS(TP1) -> MIC_1P (TP2) / MIC_1N (TP3) -> QSC6270
START
MICBIAS(TP1) is 1.8V?
Change the Main board
Sine wave appears at
MIC_1P(TP2) /MIC_1N(TP3)?
Change the KEY board
No
Make a call
Yes
Yes