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Flow Chart of Troubleshooting and Circuit Diagrams
3-2-6. PCS Transmitter
Tx ON
RF Level : 0
YES
Normal condition
Catch the channel
YES
RFSW100(RF Switch)
Pin#1 ≥ 27dBm ?
FEM100
Pin#20 ≥ 27dBm ?
PAM100
Pin#16 ≥ 27dBm ?
VCO100
Pin#5 ≒ 6dBm ?
YES
Check C137, C139
≥ 1V ?
Check the UCP300
END
NO
Check Intenna Soldering
ANTCON100, ANTCON101
NO
Resolder or change RFSW100
YES
NO
Pin#10,11 = LOW ?
YES
NO
Check C105, C106, C157, L103
Resolder or change PAM100
YES
NO
Resolder or change VCO100
NO
Check Loop filter circuit
C129, C131, C132, R111, R112
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Resolder or change FEM100
YES
FEM100
Pin#9 = HIGH &
NO
Check R104, R108
3-41
Check FEM100 control path
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