Samsung B2700 Service Manual page 61

Flow Chart of Troubleshooting
10-2-6. GSM 850 / 900 TX
TX Power is too Low!!
TCXO CLOCK CHECK?
26MHz @ C111
YES
Check the Power @
Pin#15 of U100?
YES
Check the Matching
Circuit ?
YES
Check the Power
@Pin#20 of F100?
YES
Check RFS100?
YES
Antenna
re-solder or change
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NO
OSC401, C111
re-solder or change
NO
CHECK
U100 and C103
NO
CHECK C130, L106,
C127
NO
F100
re-solder or change
NO
RFS100
change or re-solder
10-24
Band :GSM 850 / 900
CELL POWER : -50dBm
Tx Power : 5Level
Channel : 190ch / 61ch