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5-13 DCS Receiver
RF input : CH center freq. + 67.7 kHz
5-21
Rx On
Amp. : -50 dBm
U605
No
Pin 8
-50 dBm
Yes
U605
No
Pin 1
-53 dBm
Yes
U500
No
Pin 1
-53 dBm
Yes
U502
No
Pin 17, 18
-58 dBm
Yes
U502
No
Pin 1, 2
50 mV
Yes
U503
No
Pin 2, 3, 4, 5
> 100 mV
Yes
Resolder
U401
Resolder
U604
Check
VC1 : L
VC2 : L
Yes
Resolder
C617, L603
Resolder
U500, C502, C503, L500
Check
U502
No
Pin 12, 13
(Freq-100KHz)
-6 dBm
OK?
Yes
Check
U502
No
Pin 14, 23, 26, 31, 32
> 2.7 V
OK?
Yes
Check
Yes
U503
Pin 14, 16, 17, 18
OK?
No
Flow Chart of Troubleshooting and Circuit Diagrams
Check
No
Ant. s/w
control
circuit
Resolder
U605
Check & Resolder
I/O signal, RF13MHz, RF PSU Part
Resolder
U502
Check
Yes
U503
Pin 7, 20
OK?
No
Radio PSU,
RF13MHz part
Resolder
U503
Check
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