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SAMSUNG Proprietary-Contents may change without notice
Flow Chart of Troubleshooting
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9-27
9-16. GSM900 Transmitter
Resolder U101
or Check pins related to U101
Check UCP200
END
Yes
No
No
Yes
U102 pin 1,2,3,4
>= 500mV
Resolder or Change PAM100PAM 100 pin 9
Yes
Yes
No
Yes
Yes
Yes
No
No
Yes
No
No
No
Check +VBATT or PAM
control signal
Resolder or Change PAM100
Check ~ VBATT
Yes
Resolder L113,C133,C135
Check ANT Switch
control circuit
Change or Resolder U100
C142,C127 > 3 V,
C141, F101 > 3.5V
PAM100 pin9
<= 20dBm
U100 pin15
<= 20dBm
Check U100
pin14 = H (2.68V),
pin13 = L
TX ON (5 Level)
Resolder RFS100, C144, L106
U100 pin10
<= 20dBm