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8. Level 3 Repair
NORMAL CONDITION
Catch the channel?
Check soldering status(U22000) and
the voltage at
C22045,C22021,C22001=0.8V,
C22028=0.875V,
C22019,C22008=1.7V,
C22043,C22031=1.2V, C22042=1.8V
8-4-38. GSM 850/900 TX
No
Yes
No
No
Check C21083
≥ 23dBm
Check the ANT
Yes
Check C21007
≤-65dBm
Yes
Resolder or change
C21083, C21007, L21092, L21009
No
Check component
soldering status ok?
U21000
Resolder or change
U21000
No
Yes
Check C21014
≤-65dBm
Resolder or change
F21000, C21014, L21010
No
Check C21072
≤-65dBm
Resolder or change
C21072
Receiver is OK?
Resolder or change
UCP500
No
Yes
Yes
Resolder or change
U22000
No
END
Check L21084
≤-65dBm
Yes
Resolder or change
L21084
Yes
Check component
soldering status ok?
U21008
Resolder or change
U21008
No
Yes
No
