NAV4 Plus User Guide Issue 2 - ICS Electronics Limited

NAV4plus User Guide
Remote Switch
A remotely mounted NAVTEX frequency selection switch (not
supplied) may be fitted to allow remote frequency switching. To use
this feature, connect a 'single pole' switch across connection pins 7 &
8. The remote switch cable should not exceed 2M in length.
• The remote switch 'contact closed' selects 518kHz
• The remote switch 'contact open’ selects 490kHz
To enable the remote switch, always leave the in-built switch in the
490 position.
Operation
• Confirm that the NAV-490 power LED is ON
• Use the frequency selection switch to select the required
NAVTEX service
• Confirm that the NAV4plus is switched on and the appropriate
NAVTEX frequency, station and message categories are
selected
APPENDIX II : INSTALLATION OF REPLACEMENT
EPROM
Before changing the EPROM, switch on the NAV4plus and press the
N button to print out a list of the station and message selections.
• Switch off and unplug the orange connector at the rear of the
unit
• Remove the five screws from the right hand end cheek (the end
cheek nearest to the 4 pushbutton switches)
• Remove the right hand end cheek and door. Take note of the
position of any washers between the end cheeks and the door
• Remove the four outer screws from the left hand end cheek,
leave the centre screw in place
• Pull the left hand end cheek out by no more than 25mm so that
the internal printer support slides clear of the EPROM chip which
is on the edge of the printed circuit board. Do not allow the door
and door rod to angle away from the end cheek as this will
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