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Flow Chart of Troubleshooting and Circuit Diagrams
3-37
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3-2-2. EGSM Transmitter
Tx ON
RF Level : 5
YES
Normal condition
Catch the channel
NO
NO
RFSW100(RF Switch)
Pin#1
≥
30dBm ?
END
Check the UCP300
YES
NO
Check Intenna Soldering
ANTCON100, ANTCON101
Resolder or change RFSW100
Check R103, R106
Resolder or change VCO100
FEM100
Pin#9,10 = HIGH &
Pin#11 = LOW ?
Resolder or change FEM100
Check FEM100 control path
NO
YES
VCO100
Pin#1
≒
6dBm ?
PAM100
Pin#9
≥
30dBm ?
FEM100
Pin#22
≥
30dBm ?
Check C137, C139
≥
1V ?
NO
Check C108, C155, C156, L121
Resolder or change PAM100
Check Loop filter circuit
C129, C131, C132, R111, R112
NO
NO
YES
YES
YES
YES