Samsung SGH-U900 Service Manual page 69

Flow Chart of Troubleshooting
10-2-7. WCDMA2100 TX
TX Power is too Low!!
TCXO CLOCK CHECK?
19.2MHz @ C231
YES
Check the Power @
Pin#59 of U200?
YES
Check F200 ?
YES
Check PAM200?
YES
Check CPL200
YES
Check DUP200?
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 C219
NO
F200
re-solder or change
NO
PAM200
re-solder or change
NO
CPL200
re-solder or change
NO
DUP200
re-solder or change
NO
PAM100
re-solder or change
NO
RFS100
change or re-solder
10-27
Band :WCDMA
CELL POWER : -50dBm
DL Channel : 10700Ch
UL Channel : 9750 Ch
Target Power : 24dBm