Furuno NX-700B Service Manual page 81

An alarm output is outputted with the contact signal: normally open when a message A,
B, D or L is received. By the use of the photo MOS relay, the output circuit provides
the maximum rated output of 50 VDC and 0.5 A.
The message A, B and L can be set to ON or OFF by the system setting. As for the
message D, an alarm is always output when this message is received.
U8
CPU
ALM
P104
P95
U17
G3VM 61E
ALM
NX-700B
+5V
ALARM
(MOS FET RL)
1
U17
4, 6
G3VM 61E
5
2
Q10
18V
ALARM BZ
Q4
EB3120A 35C150 12V
CPU(08P3225)
Fig. 5.3.4 Alarm circuit
NX-7001
J403
Normal Open
50V 0.5A max.
1. ALM H
2. ALM C
3. FG
4. SD
5. RD
Backup battery
6. SG
7. FG
8. NC
5-10
5.3 Block Description
ALM BZ
Open
Close
ALM Msg.
Received
Hit any key