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G700-U10 Smartphone
Maintenance Manual
Troubleshooting Process
Figure 10-46 Troubleshooting microphone failures
Circuit Signals
Table 10-14 Circuit signals of this section
Signal
VMIC
MICP0
MICN0 Differential signal input's negative electrode
Issue 1.0 (2013-07-22)
Microphone failure
Is the
microphone
normal?
Y
Is the microphone
circuit normal?
Y
Replace
U401
Description
Microphone power supply
Differential signal input's positive electrode
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
N
Replace the
microphone
N
Clear faults on the
circuit
Reference Value or Waveform
1.9 V
Analog differential signal
Analog differential signal
10 Circuit and Failure Analysis
72
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