![background image](http://html.mh-extra.com/html/samsung/sgh-d900/sgh-d900_service-manual_1190498053.webp)
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
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