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Flow Chart of Troubleshooting
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7-31
7-18. GSM900 Transmitter
F101 Pin8
>= 20dBm
Resolder RFS100,C103,L141
TX ON (5Level)
Check U100
pin12 =
H (2.68V)
pin9,13 = L
F101 pin11
>= 18dBm
PAM100 pin10
>= 18dBm
U104
pin5
<= -15dBm
PAM100 pin9
<= -11dBm
Check ANT Switch
control circuit
Change or Resolder F101
Resolder L138, C152
Yes
Check PAM100
pin 3,4,5,6,7 OK?
Resolder or Change PAM100
Check +VBAT or PAM
control signal
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
U102 pin 6,7,8,9
>= 1V
Check & Resolder RFLO
signal, RF26MHz,
RF PSU Part
No
Yes
Yes
END
Check UCP200
Resolder U102
No
Check U102
pin23, 26, 31
>=2.7V
Check UCP200
Resolder U104,U105,
F102,C139,C154,C155,L136
Check U104,U105
pin 4 = 2.7V
No
Yes