Huawei Ascend G510, Maintenance Manual

Page: 71 / 96

G510 Maintenance Manual V1.0 INTERNAL
2013-01-28
Huawei Confidential Page 71 of 96
Analysis
The G510 provides the primary and secondary microphones to collect different voice signals
and processes the collected voice signals to filter noises. The G510 uses the following power
supplies:

HSED_MICBIAS (headset microphone, PM8029/HSED_BIAS1)

SND_MICBIAS (secondary microphone, PM8029/HSED_BIAS2)

MSM_MICBIAS (primary microphone, 7227A/MIC_BIAS)
Troubleshooting
Fault symptom: The G510 fails to transmit voices.
Handling: Troubleshoot the fault according to the process shown in Figure 9-34.
Figure 9-34 Troubleshooting process when the G510 fails to transmit voices
After a call is established, no
voice is transmitted.
Is the software
properly
reloaded?
End
Y
Is voice properly
the
microphtransmitt
ed after one is re-
soldered?
N
End
Y
N
Is the MICBIAS
voltage normal?
Check
C507.
N
Y
Is voice properly
transmitted after
microphone
replacement?
End
Y
N
Return the U8825-1 to Huawei
for repair.