Dcs Receiver - Samsung SGH-E330N Service Manual

7-14. DCS Receiver

RX ON
RF input : CH center freq
Amp : -50dBm
Y e s
U103 Pin7
> = -65dBm
Y e s
U103 pin1
> = -65dBm
Y e s
F102 pin1
> = -70dBm
Y e s
U100
pin38 > = -70dBm
pin39 > = -70dBm
Y e s
U100 pin6 , 7 , 8 , 9
> = 1V
Y e s
R116 , R117 , R119 ,
R121 > = 1V
Y e s
Check U706
END
No
Resolder CN502, C144
No
No
Resolder F102, C116, L107
No
Resolder C115, C117, L106
No
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Check U103
pin4 = L , pin8 = L
Y e s
Check U100
pin10, 2 2, 2 8 > = 2.7V
pin20 > = 4 .0V
Y e s
7- 21
Flow Chart of Troubleshooting
No
Check ANT Switch
control circuit
Resoder U103
No
Check & Resolder
RF PSU Part
Check & R esolder
U100, RF26MHz part,
R100 , R101