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Flow Chart of Troubleshooting
7-24
13. GSM Transmitter
U100 Pin7
>= 20dBm
Resolder CN100, C104
TX ON (5Level)
Check U100
pin4 = H (2.68V),
pin2,8 = L
U100 pin11
>= 18dBm
U101 pin6
>= 18dBm
OSC100 pin1
>= -15dBm
U101 pin48
>= -11dBm
Change or Resolder U100
Check ANT Switch
control circuit
Resolder L115, C112
Resolder R114, R116, R117
U102 pin6, 7, 8, 9
>= 1V
Yes
Check U101
+VBATT, pin42,43
OK?
Resolder or Change U101
Check +VBATT or PAM
control signal
Check & Resolder RFLO
signal, RF13MHz,
RF PSU Part
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
No
END
Check U205
Resolder U102
Yes
Check U102
pin4,10,22 >=2.7V
OK?