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Flow Chart of Troubleshooting
9-35
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U101 CHECK
Pin#1
≥
0
dBm?
9-12-8. DCS1800 / PCS1900 TX
Band :DCS1800/PCS1900
CELL POWER : -50dBm
Tx Power : 0 Level
Channel : 690/660ch
U102 CHECK
Pin#56
≥
3
dBm?
U102,
change or re-solder
TX Mode CHECK
U101 Pin#6,7
≥
1.2V
?
OSC CLOCK
CHECK
U102 pin#17,18
freq:26MHz?
R103, R104, R105, C127
change or re-solder
OSC100
re-solder or change
PAM100
change or re-solder
NO
YES
NO
NO
YES
YES
YES
PAM100 CHECK
Pin#17
≥
27
dBm?
NO
Antenna
re-solder or change
NO
TX Power is too Low!!
C104, L102
change or re-solder
RFS100
Pin#1
≥
27
dBm?
NO
YES
UCP300
re-solder or change
YES