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SAMSUNG Proprietary-Contents may change without notice
Flow Chart of Troubleshooting
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7-26
7-14. GSM850 Transmitter
Check U102
pin23, 26, 31
>=2.7V
No
Resolder U102
Check UCP200
END
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
Check & Resolder RFLO
signal, RF26MHz,
RF PSU Part
Check +VBAT or PAM
control signal
Resolder or Change PAM100
Check PAM100
pin 3,4,5,6,7 OK?
Yes
U102 pin 6,7,8,9
>= 1V
Resolder U104,U105,
F102,C141,C142,L117
Resolder L138, C152
Change or Resolder F101
Check ANT Switch
control circuit
PAM100 pin9
<= -11dBm
U104
pin5
<= -15dBm
PAM100 pin10
>= 18dBm
F101 pin11
>= 18dBm
Check U100
pin12 =
H (2.68V)
pin9,13 = L
TX ON (5Level)
Resolder RFS100,C103,L141
F101 Pin8
>= 20dBm
No
Check U104,U105
pin 4 = 0V
Yes
No
Check UCP200