U9500 Maintenance Guide
9 Troubleshooting
Issue 1.2 (2012-6-30)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
89
Figure 9-69
Handling process for the GSM RF reception failure
GSM RF reception failure
Does the phone function
properly after being upgraded to
the latest software version?
Y
End
N
Check whether the power
supply to the RF circuit is
normal.
N
Replace U4802.
Y
Does the phone function
properly after having U4703
and then U4702 replaced?
Y
End
N
Replace U3801.
Does the phone function properly
after having U4701 replaced?
Y
End
N
Is the RF index normal?
N
Y
Check whether the
RF cable is in good
condition and whether
the antenna spring is
in good contact with
the antenna.
Is the fault rectified after you
replace the corresponding
circuit according to the defective
frequency band?
Y
End
N
