Samsung SGH-E390 - PCS Receiver

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Flow Chart of Troubleshooting
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9-27
9-16. PCS Receiver
Yes
F100 Pin10
>= -65dBm
No
Resolder RFS100,C101,L100
Yes
Check ANT Switch
control circuit
F100 pin7,8
>= -68dBm
Check F100
pin13,pin14 = L
NoNo
Resolder F100
Yes
Yes
No
U102
pin 22 >= -74dBm
pin 23 >= -74dBm
Yes
No
Resolder C105,L106,C106
U102 pin 1,2,3,4
>= 1V
Yes
No
Check U102 pin
5,8,19,31,35,39
>=2.7V
Check & Resolder
U102,
C129,R103,R104,C123,
C127,C134,C135
RF26MHz, RF PSU Part
Yes
Resolder U102
Check UCP200
END
RX ON
RF input : CH center freq : +67.7kHz
Amp : -50dBm