Furuno FR-2125 - ARPA Start-Up Sequence

2-6
ARPA start-up sequence
Figure 2.2 ARPA Start-up sequence
Initializes DSP.
CR17 on pcb
18P9002 blinks
every two seconds.
Waits for initialization
of DSP RAM (between
DSP and MAIN CPU).
FE starts operating.
Monitors gyro and
speed log signals.
FR2115-SME-13
END
Yes
No
OK
Tx ON
Monitors radar input
signals (HD, BP,
TRIG, VIDEO).
No
Yes
Yes
OK
No
Yes
Display radar picture
(radar signal
processing)
ARPA(18P9002)
Initializes NAIN CPU.
Initializes DSP RAM
(between MAIN CPU
and SPU).
CR1 on pcb
18P9002 blinks.
Tx ON
END
Yes
No
Initializes DSP RAM
(between DSP and
MAIN CPU).
Yes
No
GYRO/LOG
Alarm
Normal Operation
The LED on ARPA Board
lights
Power ON
Initializes SPU Board.
Communicate with
DPRAM on ARPA
Board to confirm
presence/absence of
ARPA Board.
YES
Starts up with
no ARPA.
Starts up with ARPA.
RADAR
No
Yes
* A reset pulse is generated when +5 V line drops
to about 4.2 V.
(03P9253)