Huawei G700-U10 Maintenance Manual page 81

G700-U10 Smartphone
Maintenance Manual
Troubleshooting Process
Figure 10-50 Troubleshooting headset earpiece failures
Figure 10-51 Troubleshooting headset microphone failures
Issue 1.0 (2013-07-22)
Headset earpiece
failure
Is J1101 normal?
Y
Are components on
the left and right
audio channels
normal?
Y
Is any component on
the earphone circuit
short-circuited to the
ground?
Y
Replace U401
Headset microphone
failure
Is J1101 normal?
Y
Is the EARBIAS
voltage normal?
Y
Is the microphone circuit
short-circuited to the
ground?
Y
Replace U401
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N
Replace
J1101
N
Replace the
faulty
components
N
Clear faults
on the circuit
N
Replace
J1101
N
Identify the
cause and
fix it
N
Clear faults
on the circuit
10 Circuit and Failure Analysis
76