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5-13 DCS Receiver
RF input : CH center freq. + 67.7 kHz
Amp. : -50 dBm
≥ -65 dBm
≥ -65 dBm
≥ -70 dBm
≥ -60 dBm
≥ -60 dBm
(225 MHz)
Pin 24, 25, 26, 27
Check U454
Pin 32,33 ≥ 2.5 V
Pin 35 ≥ 2.5 V
5-22
Rx On
U203
No
Pin 8
Yes
U203
No
Pin 1
Yes
F203
No
Pin 3
Yes
F204
No
Pin 3
Yes
U454
No
Pin 2, 3
Yes
U454
No
Pin 49, 50
≥ -50 dBm
Yes
U454
No
Pin 43, 44
(45 MHz)
≥ -55 dBm
Yes
U454
No
≥ 40 mV
Yes
No
Yes
Resolder
U467
Resolder
CN1
Resolder &
U203 Pin 1
≥ -65 dBm
Yes
Resolder
F203
Resolder
C248, L594, C214, R224,
L406, C235, C575
Resolder
F204, C721, L595, C413
Check
C481(CH-225MHz)
≥ -20 dBm
C137(1080MHz)
≥ -20 dBm
Yes
Resolder
F200, C698, C699, C494
C215, C213, L201, R223,
C242, L212, L213, L201
Resolder
OneC(U467), U454
Resolder
U454 (Pin 32, 33,35)
SGH-N500 Flow Chart of Troubleshooting and CircuitDiagrams
Check
No
VC1 : L
VC2 : L
No
Resolder
U478
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