Dcs Receiver - Samsung SGH-X490 Service Manual

Flow Chart of Troubleshooting

7-13. DCS Receiver

RX ON
RF input : CH center freq
Amp : -50dBm
Y e s
U100 Pin7
> = -65dBm
Y e s
U100 pin1
> = -65dBm
Y e s
F102 pin1
> = -70dBm
Y e s
U101Pin38> = - 70dBm
Pin39 > = - 70dBm
Y e s
U101 pin6 , 7 , 8 , 9
> = 1V
Y e s
R130 , R 131 , R 132
, R 133 > = 1V
Y e s
Check U202
END
No
Resolder CN101, C102
No
No
Resolder F102, C104, L111
No
Resolder L105, L106, L108
No
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Check U100
pin2= L , p in4= L , p in8= L
Check U101
pin22 , 2 8 > = 2.7V
pin4 > = 4.0V
7- 26
No
Check ANT Switch
control circuit
Y e s
Resolder U100
No
Check & Resolder
RF PSU Part
Y e s
Check & Resolder
U101 , RF26MHz part
R104 , R105