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7-11. GSM Transmitter
TX ON (5Level)
Yes
U101 Pin7
< 18dBm
Yes
U101 pin10
< 20dBm
Yes
PAM101 pin16
< 20dBm
Yes
PAM101 pin12
< -15dBm
Yes
U102 pin38
< -11dBm
Yes
U102 pin7, 8, 9, 10
< 1V
Yes
Check U202
END
No
Resolder RFS101, C104, L123
No
No
Resolder C130, C133, L118
No
No
Resolder R109, R110, R111,
No
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Check U101
pin4 = H (2.68V),
pin2,8 = L
Yes
Check PAM101
+VBAT,
pin2,3,13,14 OK?
Yes
F104, L124, C149
Check U102
pin23, 26, 31
>=2.7V
Yes
7-37
Flow Chart of Troubleshooting
No
Check ANT Switch
control circuit
Change or Resolder U101
No
Resolder or Change PAM101
Check +VBAT or PAM
control signal
Check & Resolder U102,
No
R107, R108, RF26MHz,
RF PSU Part
Resolder U102
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