Samsung SGH-U900 Service Manual page 67

Flow Chart of Troubleshooting
10-2-5. EGSM900 TX
TX Power is too Low!!
TCXO CLOCK CHECK?
19.2MHz @ C231
YES
Check the Power @
Pin#55 of U200?
YES
Check the Attenuation
Circuit ?
YES
Check F102 ?
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 C225
NO
CHECK R104, R107,
R108
NO
F102
re-solder or change
NO
PAM100
re-solder or change
NO
RFS100
change or re-solder
10-25
Band :GSM
CELL POWER : -50dBm
Tx Power : 5Level
Channel : 62ch