7-4
2. NG of “RCVR-1” and “RCVR-2”
DSC watch keeping receiver board, RCVR-1 and DSC general watch keeping receiver board, RCVR-2
are successively tested. The test is executed controlling these receivers from Main CPU, as shown in the
figure below. The test signal is 18 MHz carrier modulated by the mark and space signals. The demodu-
lated signal from the receiver, 1700+85Hz, inputs to MODEM via LINE OUT line. If the demodulated
mark and space can not be recognized, “NG” appears.
If the receiver is “NG”:
- RCVR-1 NG --> Change this DSC watch keeping receiver board with new one.
- RCVR-2 NG --> Change this DSC general watch keeping receiver board with new one.
1.DAILY TEST
SYN
18MHz
ANT
Co
RF
(1700Hz + 85Hz)
RX(05P0703)
CONTROL/MODEM
(05P0702)
MODEM
MAIN CPU
DATA
LINE OUT
(SNY-DATA,TEST,FIL-SEL)
456.7kHz + 85Hz
3Lo
RCVR-1
RCVR-2
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