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8. Level 3 Repair
NORMAL CONDITION
Catch the channel?
Check soldering status(U2102)
and the voltage at
C2081,C2003,C2077=0.8V,
C2002=0.875V,
C2008,C2007=1.7V,
C2086,C2087=1.2V
8-4-34. GSM 850/900 TX
Yes
No
No
Check RFS1000
about
≥ 23dBm?
Check the ANT1000
Yes
Check C1006
≥ 23dBm
No
Resolder or change
RFS1000,C1006,L1003,C1005
Yes
Check C1016
≥ 23dBm
No
Resolder or change
F1000, C1016
Yes
Check component
soldering status ok?
U1010,U1002
Resolder or change
U1010,U1002
No
Receiver is OK?
Resolder or change
UCP500
No
Yes
Yes
Resolder or change
U2102
No
END