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SGH-N620E Flow Chart of Troubleshooting
12. GSM Transmitter
TX ON (5Level)
Yes
U301 Pin 8
≠30dBm
No
U301 pin5
≠ 30dBm
No
U303 pin 7
≠ 30dBm
No
U303 pin7
≠ 0dBm
No
U302 pin 25
≠ 0dBm
No
U302 pin 5, 6, 7,
8 ≠ 40mV
No
Resolder U303
END
Yes
Yes
Yes
Resolder C308
Yes
Yes
R306 R307 R308, C321
Yes
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Resolder U301
Check U100
VC1 : L
VC2 : H
No
Check U303,
+VBATT, pin2, 5,
6 OK?
No
Resolder
Check U302
pin9, 10, 12, 13 ≠
-6dBm OK?
Yes
Check U302
pin9, 10, 12, 13 ≠
-6dBm OK?
Yes
Resolder U302
7-17
Yes
Change or Resolder U301
Check ANT Switch
control circuit
Yes
Resolder or Change U303
Check +VBATT or PAM
control signal
Yes
Check and Resolder
I/O signal RF 13MHz,
RF PSU part
No
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