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5-20
Flow Chart of Troubleshooting and Circuit Diagrams
5-14 DCS Receiver
RX ON
RF Input : CH center freq.+67.7kHz
Amp. -50dBm
Resolder CN101, C101
Check ANT Switch
control circuit
U100 Pin8>=-65dBm
U100 Pin1>=-65dBm
Check U100 Pin11=L
Pin2=L
F101 Pin1>=-70dBm
Resolder F101, C113,
L105
U101 Pin35>=-70dBm
Pin36>=-70dBm
Resolder L104, C111,
C114
U101 Pin5, 6, 7, 8
>=1V
U101 Pin26
(RF freq.)+100kHz
>=-30dBm
Check & Resolder U103,
R105, R109
RF13MHz, RF PSU PART
R100,R101,R102,R103
>=1V
Check U200
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
Yes
No
No
No
Yes
Resolder U100
Check U101
Pin2,12,4,23>=2.7v
No
Resolder U101
Yes