WCDMA reception failure
Check whether the RF
connection cable is
normal and whether the
antenna spring is in
good contact
End
Rectify transmission
exceptions in the
preceding transmitter
Replace U3901, and
U3501 or U3401 in
sequence
End
End
Yes
Yes
No
No
Yes
Yes
No
No
Yes
Yes
No
No
Replace the modem U300
Yes
Is the failure
rectified after the related circuit is
replaced?
Are the
wired specifications
normal?
Is the failure
rectified after the software
is updated to the latest
version?
Spot-check the RF
signals received before U3301 based
on the non-signaling transmission of the
frequency band. Are the signals
normal?
Is WCDMA transmission
normal?
Are the RF signals received
after U3301 normal?
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