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U8185
Maintenance Manual
Troubleshooting Process
Failure: No sound is picked up or transmitted during a call.
Figure 9-28 No sound transmitted during a call
Circuit Diagram Signal Summary
See section 9.4.6 "Headset."
Issue 1.0 (2012-03-23)
No sound is transmitted
after a call is set up
Re-install the
software. Problem
solved?
N N
Re-solder the
microphone.
Problem solved?
N N
Is the microphone
line normal?
Y Y
Is the microphone's
bias voltage 1.8 V?
Y Y
Replace the
microphone.
Problem solved?
N N
Send the phone to an
advanced service site
for repair
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Copyright © Huawei Technologies Co., Ltd.
Y Y
End
End
Y Y
N N
End
Check U401
N N
Y Y
End
9 Principles and Failure Analysis
59
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