GSM RF transmission failure
Check whether the RF
connection cable is normal
and whether the antenna
spring is in good contact
End
Follow the power supply
maintenance procedure to
rectify the failure
Replace U3401 and
U3702
End
End
Yes
Yes
No
No
Yes
Yes
No
No
Yes
Yes
No
No
Replace U3801
Replace U3301
No
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
output RF signals of U3702 based on
the non-signaling transmission of the frequency
band. Are the signals
normal?
Is the RF PA power
supply normal?
Replace the
corresponding diplexers U3702 and
U3401 based on the abnormal frequency band.
Is the failure
rectified?
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