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5-13 DCS Receiver
RF input : CH center freq. + 67.7 kHz
Amp. : -50 dBm
Pin 24, 25, 26, 27
Check U454
Pin 32,33 ≥ 2.5 V
5-22
Rx On
U203
No
Pin 8
≥ -65 dBm
Yes
U203
Pin 1
≥ -65 dBm
Yes
F203
No
Pin 3
≥ -70 dBm
Yes
F204
Pin 3
≥ -60 dBm
Yes
U454
No
Pin 2, 3
≥ -60 dBm
Yes
U454
Pin 49, 50
(225 MHz)
≥ -50 dBm
Yes
U454
No
Pin 43, 44
(45 MHz)
≥ -55 dBm
Yes
U454
No
≥ 40 mV
Yes
No
Pin 35 ≥ 2.5 V
Yes
Resolder
U618
Resolder
CN1
Resolder &
No
U203 Pin 1
≥ -65 dBm
Resolder
F203
Resolder
C248, L594, C214
L406, C235, C575
Resolder
F204, C721, L595
Check
C481(CH-225MHz)
No
≥-20 dBm
C137(1080MHz)
≥ -20 dBm
Resolder
F200, C698, C699, C494
C215, C213, L201, R223,
C242, L212, L213
Resolder
OneC(U618), U454
Resolder
U454 (Pin 32, 33,35)
Flow Chart of Troubleshooting and Circuit Diagrams
No
Yes
No
Yes
Check
VC1 : L
VC2 : L
Resolder
U478
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