Samsung SGH-U900 Service Manual page 61

Flow Chart of Troubleshooting
10-2-1. EGSM900 RX
NORMAL CONDITION
catch the channel?
YES
PAM100 CHECK
pin#8 ≥ -65dBm ?
YES
PAM100 CHECK
pin#4 ≥ -65dBm ?
YES
F100 CHECK?
YES
TCXO CLOCK CHECK?
19.2MHz @ C231
YES
U200 Check?
YES
UCP300 CHECK!!
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NO
CHECK
ANT contact ?
NO
PAM100, RFS100
re-solder or change
NO
PAM100
re-solder or change
NO
F100
re-solder or change
NO
TCX200, C231
re-solder or change
NO
U200
change or re-solder
10-19
Band : EGSM
CELL POWER : -50dBm
Channel : 62Ch