Dcs Receiver - Samsung SGH-R200 Service Manual

5-13 DCS Receiver

RF input : CH center freq. + 67.7 kHz
Amp. : -50 dBm
Pin 24, 25, 26, 27
Check U301
Pin 32,33
5-22
Rx On
U401
No
Pin 8
-65 dBm
Yes
U401
Pin 1
-65 dBm
Yes
F301
No
Pin 3
-70 dBm
Yes
F302
Pin 2
-60 dBm
Yes
U301
No
Pin 2, 3
-60 dBm
Yes
U301
Pin 49, 50
(225 MHz)
-50 dBm
Yes
U301
No
Pin 43, 44
(45 MHz)
-55 dBm
Yes
U301
No
40 mV
Yes
No
2.5 V
Pin 35 2.5 V
Yes
Resolder
U110
Resolder
J401
Resolder &
No
U401 Pin 16
-65 dBm
Resolder
F301
Resolder
C305, L304, C381, L308
C306, C307, C313
Resolder
F302, C358, L307
Check
C348(CH-225MHz)
No
-20 dBm
C343(1080MHz)
-20 dBm
Resolder
F303,C321,C324,C325
C333,C340,C336,L313, R305
Resolder
OneC(U110), U301
Resolder
U301 (Pin 35, Pin 32, 33)
Flow Chart of Troubleshooting and Circuit Diagrams
No
Yes
No
Yes
Check
VC1 : L
VC2 : L
Resolder
U304