U9200 Maintenance Manual
INTERNAL
(2012-06-13)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Page 75 of 80
9.23 GSM RF Transmitting Failure
Figure 9-31
GSM RF transmitting failure troubleshooting process
GSM RF transmitting failure
Is the RF index
recovered after you
update the software?
Y
End
N
Is the power supply of the
RF circuit normal?
N
Replace the
U4802.
Y
Is the fault rectified
after you replace the
U4703, U4801, and
U4704 respectively?
Y
End
N
Is the fault rectified
after you replace the
U4701?
Y
End
N
Is the RF index normal?
N
Y
Check if the RF
cable is in good
condition and the
antenna clip in
good contact.
Replace the U3801.
Y
End
N
Is the fault rectified after
you replace the matching
circuit considering the
unfavorable frequency
band?
N
