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SAMSUNG Proprietary-Contents may change without notice
Flow Chart of Troubleshooting
7-18
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12. GSM Transmitter
U102 pin10
>= 20dBm
Resolder CON101, L112
TX ON (5Level)
Check U102
pin7 = H (2.68V),
pin4 = L
U102 pin10
>= 20dBm
U105 pin6
>= 20dBm
U105 pin48
>= -8dBm
U105 pin48
>= -11dB
Change or Resolder U102
Check ANT Switch
control circuit
Resolder C138, C139
Resolder R125, R127, R128
U100 pin6, 7, 8, 9
>= 500mV
Yes
Check U105
+VBATT, pin42,43,
48 OK?
Resolder or Change U105
Check +VBATT or PAM
control signal
No
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
No
Yes
Yes
END
Check U200
Yes
Check & Resolder RFLO
signal, RF26MHz,
RF PSU Part
Check U100 pin 10,
22,23>=2.7V
OK?
Resolder U100