Huawei U9500 Maintenance Manual page 97

U9500 Maintenance Guide
Figure 9-72 Handling process for the GSM RF transmission failure
Issue 1.2 (2012-6-30)
GSM RF transmission failure
Is the RF index normal?
N
Does the phone function properly
after being upgraded to the latest
software version?
N
Check whether the power
supply to the RF circuit is
normal.
Y
Does the phone function properly
after having U4703, U4701, and then
U4704 replaced?
N
Does the phone function properly
after having U4701 replaced?
N
Is the fault rectified after you replace
the corresponding circuit according
to the defective frequency band?
N
Replace U3801.
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9 Troubleshooting
Check whether the
Y
RF cable is in good
condition and whether
the antenna spring is
in good contact with
the antenna.
Y
End
N
Replace U4802.
Y
End
Y
End
Y
End
92