Dcs Receiver - Samsung SGH-N625 Service Manual

5-13 DCS Receiver

RF input : CH center freq. + 67.7 kHz
Flow chart of trouble shooting
Rx On
Amp. : -50 dBm
U602
No
Pin 8
Yes
U602
No
Pin 1
Yes
U604
No
Pin 3
Yes
U634
No
Pin 3
Yes
U605
No
Pin 2, 3
Yes
U605
No
Pin 49, 50
(225 MHz)
Yes
U605
No
Pin 43, 44
(45 MHz)
Yes
U605
No
Pin 24, 25, 26, 27
Yes
Check U605
No
Yes
Resolder
U501
Check IF connector
- > resolder
Resolder &
U602 Pin 1
Yes
Resolder
U604, C624
Resolder
U605, C646, C647, L620
L618, C700, L607
Resolder
U634, C625, L608
Check
C600(CH-225MHz)
C636(1080MHz)
Yes
Resolder
U601, C604, C605
L603, C612
Resolder
OneC(U501), U605
Resolder
U605 (Pin32, 33, 35)
Check
No
VC1 : L
VC2 : L
No
Resolder
U612
5-22