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Flow Chart of Troubleshooting
9-24
9-15. GSM900 Receiver
RX ON
RF input : CH center freq : +67.7kHz
Amp : -50dBm
Yes
MOD100 Pin10
>= -65dBm
No
Resolder RFS100,C100,L102
Yes
Check ANT Switch
control circuit
MOD100 pin3,4
>= -68dBm
Check MOD100
pin13, 14 = L
No
No
Resolder MOD100
Yes
No
Resolder L112, L114, L115
U102
pin 27 >= -74dBm
pin 28 >= -74dBm
Yes
No
No
Check U102 pin 5,
15, 17, 20, 31, 38
>=2.8V
U102 pin 1,2,3,4
>= 1V
Check & Resolder
U102, C117
RF26MHz, RF PSU Part
Yes
Yes
Resolder U102
Check UCP200
END
Yes
Содержание SGH-D900
Страница 28: ...8 PCB Diagrams 8 1 8 1 Main PCB Diagram Top ...
Страница 29: ...PCB Diagrams 8 2 Bottom ...