Arpa Start-Up Sequence - Furuno FR-2115 Service Manual

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