4. TROUBLE SHOOTING
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4.19.5 Headset micr ophone
- MIC Signal : 3.5 pi Headset (CN7001) -> FB7004 -> R7004 (TP4) MIC of MAX14579E & C2008 (TP3) MIC2P of MSM7225A
- MIC Bias : VREG_MSME_1.8V -> R7003 (TP1) DET -> R7005 DET_IN -> Headset MIC
- HS Detect IC Bias: VREG_P3_2.85V-> C7006 (TP2)
No
START
Make a call
Yes
No
Make a some sound or voice to MIC
Yes
R7003(TP1) is about 1.8V?
Some sound signal appears at
R7004 (TP4)?
Some sound signal appears at
C2008 (TP3)?
Yes
Work Well?
END
Yes
No
Change the U2000 (MSM7225A) or
Change the Main PCB
C7006(TP2) is about 2.85V?
Change the U7000 (MAX12579E) or
Change the Main PCB
Change the Headset or Re-solder/
Change the CN7001 or
Change the Main PDB
No