Huawei Y511-U030 - 9.4.5 Mic

XXXX The basic version Repair ManualV1.0
internal public
2013-09-25
华为机密，未经许可不得扩散
第 67 页，共 79 页
9.4.5 Mic
 Circuit Principle Diagram
 Circuit analysis:
A circuit connected with the outside of a microphone, when in normal work, power supply chip
provides a bias voltage to the microphone, the microphone to pickup, signal through a coupling
capacitor into the power chip.
 Fault analysis and treatment process:
No words can check whether the normal pathway of MIC welding, voice input signal
AU_VIN0_P, AU_VIN0N and power supply chip. Bad welding or replace the relevant device
according to the chip, power supply, MIC peripheral circuit, etc..