Furuno FS-1570 Service Manual page 179

6.1 Self-test
DSC test items
MAIN CPU
Displays T-CPU program version.
PANEL 1
Displays C-CPU program version of FS-2570C connected to [CONTLOLLER-1].
T-CPU communicates with C-CPU.
PANEL 2
Displays C-CPU program version of FS-2570C connected to [CONTLOLLER-2].
T-CPU communicates C-CPU.
with
When No.2 FS-2570C is not connected, PANEL 2 line is blank.
MODEM
Displays the program version of DSC DSP board (05P0751). T-CPU communicates
with DSC DSP.
NBDP MODEM
Displays the program version of NBDP DSP board (05P0751). T-CPU communicates
with NBDP DSP. When NBDP DSP board is not installed, NBDP MODEM line is
blank.
RCVR 1
DSC watch receiver (W/R1 board, 05P0734) is tested. J2B, 18 MHz signal, modulated
by mark and space tones, is applied to antenna input line, using a stray capacitor; Cs.
The signal level is about 70 to 80 dB. DSP board (Modem) detects the tone signal when
W/R board is normal.
Fig.6.1.1 RCVR test signal flow
6-3