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Flow Chart of Troubleshooting and Circuit Diagrams
3-2-8. UMTS Transmitter
Tx ON
RF Input : 9750Ch
Cell Pwr : 24dBm
YES
Normal condition
Catch the channel
RFSW100(RF Switch)
Pin#1, 2 ≥ 20dBm ?
YES
FEM100
Pin#4 ≥ 20dBm ?
DUT200
Pin#3 ≥ 20dBm ?
PAM200
Pin#8 ≥ 20dBm ?
F200
Pin#3 ≥ -2dBm ?
YES
U100
Pin51 ≥ -2dBm ?
Check C137, C139
≥ 1V ?
Check the UCP300
END
NO
ANTCON100, ANTCON101
NO
Resolder or change RFSW100
NO
Pin#9,11 = HIGH &
NO
NO
Check PAM200 pin#5 = HIGH ?
NO
NO
NO
Check or resolder UCP300
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Check Intenna Soldering
YES
FEM100
Pin#10 = LOW ?
NO
Resolder C202 or
change DUT200
Resolder or change F200
Check C203, C204
Resolder or change F200
Check the path of U100
3-47
Resolder or change FEM100
Check FEM100 control path
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