Furuno NX-700B Service Manual page 119

Q9. Under what conditions is an alarm outputted?
An alarm is outputted when a message D, A, B or L is received. However, a
message A, B and L can be set as ON or OFF by the setting of "[MENU] ->
System -> Warn Msg Alm".
Q10. How can the alarm output be checked?
It would be better to check the alarm action waiting for the receipt of an alarm
message. However, this method does not allow checking on alarm output on the
instant. It can be checked in "Contact Signal Test" in the Factory Test menu.
To enter the Factory Test menu, turn the power on while holding down the [+] and
[-] keys of the DIM.
The alarm output is normally open with MOS relay output. The alarm output and
alarm buzzer are linked with each other.
Q11. Should only pressing any key stop an alarm?
An alarm can also be stopped by the ACK sentence from the INS.
The setting for this;
･ In case of program Ver-01.02:
Select "INS" in "[MENU] -> NAVTEX -> Receive Mode"
Select "Receive" in "[MENU] -> Initialize2 -> ACK Command"
･ In case of program Ver-02.01:
Select "INS" in "[MENU] -> NAVTEX -> Mask Mode"
Select "Receive" in "[MENU] -> Initialize2 -> ACK Command"
Q12. Power cannot be turned on. What parts should be checked? (3-9, 5-11)
The power is inputted through NX-7001, from which power is supplied to the
Display unit.
1) Check the fuse (2 A) on the RCV board of NX-7001.
2) The operating range of the power supply voltage input is between +10.8 VDC
and +31.2 VDC.
The power supply block is incorporated in the CPU board of the Display unit.
Q13. Nav data is not displayed. What parts should be checked?
Check the following points.
1) Check the input sentence. The acceptable sentences are ZDA, GNS, GGA,
RMC, GLL, VTG, VBW and VHW.
2) Is the sentence inputted to NX-700A and NX-700B added with a checksum?
Sentences with a checksum are those of NMEA Ver-2.0 or later, or IEC61162.
In case that a sentence without a checksum needs to be inputted, select
"Receive" in "[MENU] -> Initialize2 -> Sumless NMEA."
3) Check the bit rate of the serial data input of the Nav data. It can be checked in
"[MENU] -> Service -> INS Input Speed." The bit rate should be 4800 when
directly connected to the GPS. When connection is made via the INS, set the
input speed according to the communication speed with the INS.
4) The serial data input can be checked in "[MENU] -> Initialize1 ->View NAV
Data".
8-2
Chapter 8. Q &A
(2-16)
(7-8)
(2-28)
(2-6)