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SGH-N620E Flow Chart of Troubleshooting
7-16
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11. GSM Receiver
U301 Pin8
>= -50dBm
Resolder U301
END
No
Yes
RX ON
RF input : CH center freq : +67.7kHz
Amp : -50dBm
Check
VC1 = L, VC2 =L
U301 pin10
>= -53dBm
F302 pin1
>= -70dBm
U302 pin6, 1, 2
>= 50mV
U302
pin 21, 22
Check ANT Switch
control circuit
Resoder U301
Resolder C313
Resolder
F302, C310, C312, L306
Check U302
pin 12, 13
[(Freq-1000KHz)*
2]>=-6dBm OK?
Chekc & Resolder
I/O signal, RF13MHz,
RF_PSU Part
Resolder U302
U304 pin 2,3,4,5
> 100mV
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
Resolder U205
Check U302
pin 12, 13
[(Freq-1000KHz)*
Check U304 pin
14,16,17,18 > OK?
Check U304 pin
7, 20 OK?
Resolder U304
Yes
No
Check Radio PSU,
RF13MNz part