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Flow Chart of Troubleshooting
7-
20
13. GSM Transmitter
U103 Pin7
>= 20dBm
Resolder CN100, C144
TX ON (5Level)
Check U103
pin4 = H (2.68V),
pin2,8 = L
U103 pin11
>= 20dBm
U102 pin6
>= 20dBm
OSC101 pin1
>= 6dBm
U102 pin48
>= 3dBm
Change or Resolder U100
Check ANT Switch
control circuit
Resolder L113,L114,C151
Resolder R123
U100 pin6, 7, 8, 9
>= 500mV
Yes
Check U102
VBATT,
pin42,43
OK?
Resolder or Change U102
or check PAM control signal
Check +VBATT
Check U100
pin4 >= 4.0V
pin22,28 >=2.7V
OK?
Check & Resolder
RF PSU Part
No
No
No
No
No
Yes
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
END
Check U200
Resolder U100
or check Txcpo(R114)
No