NAV6 Series NAVTEX System User Guide
47
Maintenance and Troubleshooting
Cleaning
The NAV6 NAVTEX System may be cleaned when necessary by wiping with a cloth dampened
with fresh water. Do not use solvents.
Fault Finding
Fault
Possible cause
LCD blank, RED LED On
Green wire connected to 12V
Disconnect green wire – it should not be connected other than for
programming
LCD blank, RED LED off
No power
Check that 12V is connected to RED wire and 0V to its BLACK pair
RED LED flashing with a period of 2
seconds. Display not operating.
Low voltage
There is insufficient voltage supplying the display
RED LED flashing with a period of
15 seconds. Display not operating.
Sleep Mode
Press any key to activate the display
No NAVTEX messages received
Check for SIG or ERR on status line; see below. Check siting of antenna
SIG on status line (signal fault)
If this symbol appears for short periods – don’t worry – it’s caused by
one or more NAVTEX stations transmitting carrier but no modulation,
or by local interference.
If this symbol persists then you may have a receiver error or
interference from nearby equipment.
Check for possible causes. Identify the local source of interference by
turning off items of equipment (e.g. battery charger) until the SIG
indicator is cleared
ERR on status line (communications
error)
No power to Receiver
No communications to Receiver
Check connections to receiver. Check for 12V between YELLOW wire
and its BLACK pair
Display Mode set to “Slave”
Always set the ‘Display Mode’ to “Master” in single display systems.
Two or more master displays connected to a receiver
Set the ‘Display Mode’ on one display to master and set all other
displays to slave
No GPS indicator on status line
No NMEA data on NMEA input.
Check the NMEA data connections.
Check that the GPS unit is switched on.
Check that the GPS unit is set to output compatible NMEA sentences
(see Appendix III: NMEA Sentences Supported).
