Mcmurdo NAV6 Betriebsanweisung PDF herunterladen (Seite 49)

Nav6 Plus Navtex System User Guide

49

Fault Finding

Fault FindingFault Finding

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 sensor.

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 Sensor

• No communications to Sensor

Check connections to sensor. 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 sensor

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).

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