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9-15. DCS1800 Receiver
RX ON
RF input : 685 CH
Amp : -50dBm
Yes
F100 Pin 2
>= -65dBm
Yes
F100 Pin16, 17
>= -68dBm
Yes
U101
pin 46 >= -70dBm
pin 47 >= -70dBm
Yes
U101 pin 1,3,23
>= 1V
Yes
Check UCP300
END
No
Resolder RFS100, C110
No
No
No
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Check F100
pin3 = L, pin4=L
pin5 = L, pin6 = L
Yes
Resolder or change
C121,C122,L108
Check all voltage
sources of U101
Is it OK?
Yes
9-41
Flow Chart of Troubleshooting
No
Check ANT Switch
control circuit
Resolder F100
No
Check & Resolder
CP PMIC(U401)
Resolder U101
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