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5-13 DCS Receiver
RF input : CH center freq. + 67.7 kHz
Amp. : -50 dBm
Pin 24, 25, 26, 27
Pin 32, 33
Flow chart of trouble shooting and Circuit Diagram
Rx On
U304
No
Pin 2
-65 dBm
Yes
U304
Pin 16
-65 dBm
Yes
Yes
U603
No
Pin 5
-70 dBm
Yes
F302
Pin 2
-60 dBm
Yes
U305
No
Pin 2, 3
-60 dBm
Yes
U305
Pin 49, 50
(225 MHz)
-50 dBm
Yes
U305
Pin 43, 44
No
(45 MHz)
-55 dBm
Yes
U304
No
40 mV
Yes
Check U305
No
2.5V
Pin 35
2.5V
Yes
Resolder
U108
Check RF connector
-> resolder
Resolder &
No
U304 Pin 16
-65 dBm
Resolder
U603
Resolder
C627, C724, C725, L636
Resolder
F302, C335
L638, L637
Check
C301(CH-225MHz)
No
-20 dBm
C315(1080MHz)
-20 dBm
Resolder
U601, C309, C310, C312
C313, C314, C400, R700
Resolder
OneC(U108), U305
Resolder
U305(Pin 35, Pin 32, 33)
No
VC3 : H
Yes
No
Yes
Check
VC1 : L
VC2 : L
Resolder
U302
5-20
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