Pcs Receiver - Samsung SGH-X490 Service Manual

Flow Chart of Troubleshooting

7-15. PCS Receiver

RX ON
RF input : CH center freq
Amp : -50dBm
Y e s
U100 Pin7
> = -65dBm
Y e s
U100 Pin3
> = -65dBm
Y e s
F100 Pin1
> = -70dBm
Y e s
U101 Pin35, 3 6
> = -70dBm
Y e s
U101 Pin 6, 7 , 8 , 9
> = 1V
Y e s
R130 , R 131 , R 132 ,
R133 > = 1V
Y e s
Check U202
END
No
Resolder CN101, C102
No
No
Resolder F100, C103, L104
No
Resolder L101 , L102 , L103
No
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Check U100
pin2= H , p in4= L , p in8= L
Check U101
pin4 > = 4.0V
pin22 , 28 > = 2.7V
7- 30
No
Change
or Resolder U100
Y e s
Check ANT Switch
control circuit
Check & Resolder
RF PSU part
Check & Resolder
U101, RF 26MHz part,
R104 , R105