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Flow Chart of Troubleshooting and Circuit Diagrams
3-46
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3-2-7. UMTS Receiver
Rx ON
RF Input : 10700Ch
Cell Pwr : -40dBm
YES
Normal condition
Catch the channel
NO
NO
END
Check the UCP300
NO
Resolder or change RFSW100
FEM100
Pin#9,11 = HIGH &
Pin#10 = LOW ?
Resolder or change FEM100
Check FEM100 control path
NO
YES
NO
YES
RFSW100(RF Switch)
Pin#1, 2
≥
-50dBm ?
FEM100
Pin#4
≥
-50dBm ?
DUT200
Pin#2
≥
-50dBm ?
U202
Pin#18
≥
-65dBm ?
YES
U202
Pin#18
≥
-65dBm ?
F201
Pin3, 4
≥
-65dBm ?
U202
Pin8, 9
≥
-65dBm ?
Resolder or change C207, L203
NO
Resolder C202 or
change DUT200
NO
Resolder or change U202
NO
Check the path of F201 & U202
NO
Check Intenna Soldering
ANTCON100, ANTCON101
Check the path of F201 & U202