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Flow Chart of Troubleshooting
9-22
9-13. GSM Transmitter
TX ON (5Level)
MODULE200 Pin8
>= 20dBm
Yes
Resolder CN201, C209
No
Check
MODULE200
pin9=H,pin12=L
Change
or Resolder
MODULE200
MODULE200 Pin11
>= 20dBm
Yes
Yes
No
No
Check ANT Switch
control circuit
Yes
Resolder C217, C219, L216
MODULE200 Pin11
>= 20dBm
Check U200
+VBATT(pin17) OK?
No
Resolder or change U200
or check PAM control
signal
Yes
Yes
MODULE200 Pin11
>= 3dBm
No
Check +VBATT
No
OSC100 pin1
>= 6Bm
Resolder R206
Yes
No
Check & Resolder
RF PSU part
Check U100
pin4 >= 4.0V
pin22, 28 >= 2.7V
U100 Pin6, 7, 8, 9
>= 500mV
Yes
Yes
No
Resolder U100
or check Txcpo(R112)
No
Check U300
END