Dcs Receiver - Samsung SGH-A800 Service Manual

5-14 DCS Receiver

Flow chart of Troubleshooting and Circuit Diagram
Downloaded from www.Manualslib.com
Rx On
RF input : CH center freq. + 67.7 kHz
Amp. : -50 dBm
U704
Pin 8
-60 dBm
Yes
U704
Pin 1
-60 dBm
Yes
F600
Pin 3,4
-62 dBm
Yes
U600
Pin 17, 18
-62 dBm
Yes
U600
Pin 1, 2
(100 KHz)
-50 dBm
Yes
U601
Pin 2, 3, 4, 5
1~2 V
Yes
Resolder
U400
manuals search engine
No
Check RF connector
-> resolder
Resolder &
No
U706 Pin 1
-60 dBm
No
Resolder
F600
No
Resolder
C602, C603, L600
No
U503 pin 23,24
(CH-100KHz) X 2
No
Resolder
U601
No
Yes
Check
No
-9 dBm
Yes
Resolder
U600
Check
VC1 : L
VC2 : L
Check circuit
around U503
5-22