No Microphone Audio - Motorola MotoRAZR maxx V6 Manual

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Title: Troubleshooting-Guide MotoRAZR maxx V6

No microphone audio

Set radio in audio loop via RepairStudio/Radiocomm.
Check MIC_BIAS
for misplaced part/ low resistance to GND – if they are ok, replace ATLAS IC U3000.
If MIC_BIAS is ok, check
the audio signal caused by the blowing. If there is no audio signal visible, replace
microphone MK1. If there is an audio signal visible, replace ATLAS IC U3000.
Repair Support Information
at C4107-1 – should be around 2.1Vdc. If not, check
MIC_INPUT at C4102-1 while blowing into the microphone to see
Figure 16
Figure 17
© Copyright 2003-2007 Motorola Inc. All Rights reserved.
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Doc. No: TSG_3G_V6
Version: 1.0
Date: 23.07.2007
Page: 17 / 40
R4105/C4106/C4107