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FlowChartofTroubleshooting
7-37
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7-11. GSM Transmitter
U101 Pin7
< 18dBm
Resolder RFS101, C104, L123
TX ON (5Level)
Check U101
pin4 = H (2.68V),
pin2,8 = L
U101 pin10
< 20dBm
PAM101 pin16
< 20dBm
U102 pin38
< -11dBm
PAM101 pin12
< -15dBm
Change or Resolder U101
Check ANT Switch
control circuit
Resolder C130, C133, L118
Resolder R109, R110, R111,
F104, L124, C149
U102pin7,8,9,10
<1V
Yes
Check PAM101
+VBAT,
pin2,3,13,14 OK?
Resolder or Change PAM101
Check +VBAT or PAM
control signal
Check & Resolder U102,
R107, R108, RF26MHz,
RF PSU Part
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
No
END
Check U202
Resolder U102
Yes
Check U102
pin23, 26, 31
>=2.7V