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Flow Chart of Troubleshooting
9-24
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9-10. GSM900 Receiver
RX ON
Sector PWR=-50dBm
Resolder or change L205,L206,L207
Change U205 & UCP500
F200 Pin 2
>= -60dBm
Check U1000 Truth
Table
Pin 3 : LOW
Pin 4 : LOW
Pin 5 : HIGH
Pin 6 : LOW
No
Yes
Resolder RFS200, C200, L201, R221,
,R220
Resolder or change F200
No
F200 Pin 14,15
>= -70dBm
Yes
U205
Pin 48,49
>= -75dBm
No
Yes
Yes