Dcs Receiver - Samsung SGH-Q208 Service Manual

5-13. DCS Receiver

RX On
RF input : 62 CH
Amp. : -50 dBm
U1006
-70 dBm
U1006
-70 dBm
F1003
-73 dBm
pin 8
&
-60 dBm
pin 1, 2
-55 dBm
pin 5, 6
-60 dBm
pin 43, 44
-50 dBm
END
Y
Pin 9
Y
Pin 7 N
Y
pin 5
Y
U901
-55 dBm
2.5 Vdc
Y
F903
pin 4
Y
F902
N
Y
F902
Y
U901
N
Y
SAMSUNG Proprietary-Contents may change without notice
SGH-Q208 Flow Chart of Troubleshooting and Circuit Diagrams
•All or RF values by dBm should be measured in max hold status of
RF spectrum analyzer in active call
Resolder or Change CN1001
N
Resolder U1006,
Pin 7 -70 dBm?
Y
N
Resolder or Change U901
N
Resolder or Change F903
N
Check OSC901
pin 1 -20 dBm
Y
N
Check OSC902
pin 1 -20 dBm
Y
5-13
Check voltage
U1006 pins
Pin 2 : L
N
Pin 4 : H
Pin 8 : H
Pin 10 : L
Resolder F1003
Change OSC901
N
Resolder or
Change U901
Change F902
Resolder or change
N
OSC902
Change U901