Installation manual

Page 41
Cleaning Instructions
• Periodically clean the LCD front window with a soft lint-free cloth (such as
those supplied by opticians to clean spectacles)
• Do not used cleaning solvents on any part of the NAV-7
CAUTION: Avoid using chemical solvents to clean the system as some
solvents can damage the case material.
NOTE: The NAV-7 contains no user serviceable parts. Contact your Service Agent for
repair advice or contact the McMurdo Customer Service team.
TROUBLESHOOTING GUIDE
General Points to Check
• Make sure the antenna is mounted vertically and is clear of obstructions
• Make sure the vessel is operating within the coverage area of a NAVTEX
transmitter
• When the NAVTEX station(s) selected are transmitting, icons for 490, 518 and
4209.5 kHz show whenever a NAVTEX signal is received
• Ensure that the required NAVTEX station and message categories have not
been deselected in the NAV-7 setup menu
Antenna fault icon appears at the top of the display: active antenna
1 Turn off the NAV-7
2 Disconnect the active antenna and check that there is not a
short across the antenna’s TNC connector
3 Turn on the NAV-7, apply a 120 ohm 5 W resistor across the
TNC connector. If there is 12 V DC across the TNC then either
the antenna or coax cable is faulty
4 If there is not 12 V DC across the TNC connector then check
that Antenna power : Enabled
Antenna power : EnabledAntenna power : Enabled
Antenna power : Enabled is selected in the setup
screens
5 If these instructions do not work then please contact your
service agent
Antenna fault icon appears at the top of the display: passive antenna
1 Turn off the NAV-7
2 Disconnect the passive antenna and check that there is not a
short across the antenna TNC connector
3 Check that the Antenna power setting is set to Disabled
on the Receiver options setup screen
4 If these instructions do not work then please contact your
service agent