CDMA RF transmission
failure
Is the failure
rectified after the related circuit is
replaced?
Are the
wired specifications
normal?
Is the RF PA power
supply normal?
Check whether the RF
connection cable is normal
and whether the antenna
spring is in good contact
End
Replace U3202
Re-solder or replace
U3401. If the signals are
still abnormal, replace
U3301
End
Yes
Yes
No
No
Yes
No
No
Yes
Yes
No
Replace U3802
Replace Z3801. If the issue
persists, replace J3802
No
Yes
Is the
failure rectified after the
software is updated to the latest
version?
Spot-check the
output RF signals of U3401
based on the non-signaling transmission of the
frequency band. Are the signals
normal?
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