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10-12. RF
10-12-1. GSM850 Receiver
RX ON
RF input : CH center freq : +67.7kHz
Amp : -50dBm
Yes
F101 Pin19
>= -65dBm
Yes
F101 Pin1, 2
>= -68dBm
Yes
UPL101
pin 26 >= -70dBm
pin 27 >= -70dBm
Yes
UPL101 pin 4,5,6,7
>= 1V
Yes
Check UME301
END
No
Resolder RFS101,C106
No
No
Resolder C107,C109,L102
No
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Check F101
pin10 = L
,pin11 = L
Yes
Check all voltage
sources of UPL101
>=2.8V
Yes
10-36
Flow Chart of Troubleshooting
No
Check ANT Switch
control circuit
Resolder F101
No
Check & Resolder
RF PSU Part
Resolder UPL101
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