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Flow Chart of Troubleshooting
9-37
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PAM100 CHECK
Pin#18
≥
20
dBm?
9-12-10. WCDMA900 TX
TX Power is too Low!!
U102,F202
change or re-solder
PAM200CHECK
Pin#3
≥
0
dBm?
YES
YES
NO
OSC CLOCK
CHECK
U102 pin#17,18
freq:26MHz?
OSC100
re-solder or change
NO
PAM200,DUP200,F201,C203,L201
change or re-solder
NO
YES
TX Mode CHECK
U101 Pin#7
≥
1.2V
?
UCP300
re-solder or change
NO
YES
NO
PAM100 CHECK
Pin#17
≥
20
dBm?
PAM100
change or re-solder
YES
C104, L102
change or re-solder
RFS100
Pin#1
≥
20
dBm?
NO
YES
Antenna
re-solder or change