U9500 Maintenance Guide
9 Troubleshooting
Issue 1.2 (2012-6-30)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
86
Figure 9-66
Handling process for the WCDMA RF reception failure
WCDMA 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
