Huawei Ascend G510, Maintenance Manual

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G510 Maintenance Manual V1.0 INTERNAL
2013-01-28
Huawei Confidential Page 72 of 96
Circuit Symbols
Signal Symbol Description Reference Measurement or
Waveform
MIC1_P Primary microphone input None
MIC1_N Primary microphone input None
AUXI_P Secondary microphone input None
AUXI_N Secondary microphone input None
MSM_MICBIAS Bias voltage of the primary
microphone
None
SND_MICBIAS Bias voltage of the secondary
microphone None
9.4.5 Headset Circuit
Circuit Diagram
Figure 9-35 shows the headset circuit diagram.
Figure 9-35 Headset circuit diagram
Analysis
The headset is tested using the GPIO_026's HS_DETECT_N after being inserted to the G510:

Before the headset is inserted, HS_DETECT_N is converted to high level by VREG_S3.

After the headset is inserted, HS_DETECT_N is converted to low level.