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Flow Chart of Troubleshooting
9-14. EGSM900 Receiver
RX ON
RF input : CH center freq : +67.7kHz
Amp : -50dBm
Yes
UPL802 Pin10
>= -65dBm
Yes
UPL802 3, 4
>= -68dBm
Yes
F800
pin 21 >= -70dBm
pin 22 >= -70dBm
Yes
F800 pin 4,5,6,7
>= 1V
Yes
Check UME702
END
No
Resolder RFS00,C806
No
No
Resolder C824 C825, L807
No
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Check UPL802
pin13 = L
,pin14 = L
Yes
Check all voltage
sources of F800
>=2.8V
Yes
9-26
No
Check ANT Switch
control circuit
Resolder UPL802
No
Check & Resolder
RF PSU Part
Resolder F800
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