Samsung SGH-U900 Service Manual page 68

10-2-6. DCS1800/PCS1900 TX
TX Power is too Low!!
TCXO CLOCK CHECK?
19.2MHz @ C231
YES
Check the Power @
Pin#56 of U200?
YES
Check the Attenuation
Circuit ?
YES
Check the Power @Pin#8
of PAM100?
YES
Check RFS100?
YES
Antenna
re-solder or change
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NO
TCX200, C231
re-solder or change
NO
CHECK
U200 and C223
NO
CHECK R100, R102,
R103
NO
PAM100
re-solder or change
NO
RFS100
change or re-solder
10-26
Flow Chart of Troubleshooting
Band :DCS/PCS
CELL POWER : -50dBm
Tx Power : 0Level
Channel : 660ch