5-22
Flow Chart of Troubleshooting and Circuit Diagrams
5-13 DCS Receiver
Rx On
RF input : CH center freq. + 67.7 kHz
Amp. : -50 dBm
U401
Pin 8
≥
-65 dBm
U401
Pin 1
≥
-65 dBm
F301
Pin 3
≥
-70 dBm
F302
Pin 2
≥
-60 dBm
U301
Pin 2, 3
≥
-60 dBm
U301
Pin 49, 50
(225 MHz)
≥
-50 dBm
U301
Pin 43, 44
(45 MHz)
≥
-55 dBm
Resolder
J401
Resolder &
U401 Pin 16
≥
-65 dBm
Check
VC1 : L
VC2 : L
Resolder
F301
Resolder
F302, C358, L307
Check
C348(CH-225MHz)
≥
-20 dBm
C343(1080MHz)
≥
-20 dBm
Resolder
U304
U301
Pin 24, 25, 26, 27
≥
40 mV
Resolder
OneC(U110), U301
Check U301
Pin 32,33
≥
2.5 V
Pin 35
≥
2.5 V
Resolder
U301 (Pin 35, Pin 32, 33)
Resolder
U110
No
No
No
No
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Resolder
C305, L304, C381, L308
C306, C307, C313
Resolder
F303,C321,C324,C325
C333,C340,C336,L313, R305