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7-14. GSM Transmitter
TX ON (5Level)
U201 Pin1
>= 20dBm
No
U201 Pin4
>= 20dBm
No
U200 Pin11
>= 20dBm
No
U200 Pin4
>= 3dBm
No
OSC100 pin1
>= 6Bm
No
U100 Pin6, 7, 8, 9
>= 500mV
No
Check U300
END
Yes
Resolder CN201, C209
Yes
Yes
Resolder C217, C211, L209
Yes
Yes
Yes
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Check U201
pin3=H,pin5=L,pin2=L
Check U200
+VBATT(pin17) OK?
Resolder R206
Check U100
pin4 >= 4.0V
pin22, 28 >= 2.7V
7-23
Flow Chart of Troubleshooting
Yes
Change
or Resolder U201
No
Check ANT Switch
control circuit
Yes
Resolder or change U200
or check PAM control
signal
No
Check +VBATT
Yes
Check & Resolder
RF PMU part
No
Resolder U100
or check Txcpo(R112)
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