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Flow Chart of Troubleshooting
7-28
7-15. GSM850 Receiver
RX ON
RF input : CH center freq : +67.7kHz
Amp : -50dBm
Yes
F101 Pin8
>= -65dBm
No
Resolder RFS100,C103,L141
Yes
Check ANT Switch
control circuit
F101 pin6,7
>= -68dBm
Check F101
pin9,pin12,pin13 = L
No
No
Yes
Yes
Resolder F101
No
Resolder C105, C106, L101
U102
pin 29 >= -74dBm
pin 30 >= -74dBm
Yes
No
Check U102 pin
23,26,31 >=2.7V
U102 pin 7.8.9.10
>= 1V
No
Check & Resolder
U102, R129
RF26MHz, RF PSU Part
Yes
Yes
Resolder U102
Check UCP200
END
U100 pin3,10
>= -72dBm
Check U100
pin15 = 2.7V
Resolder U100
No
Yes
Check UCP200
No
Yes