NT-2000 REF Manual
User-Level Troubleshooting
5-2
5 . 2 . N o
M e s s ag e
R e c ep ti o n
The following description of the symptoms assumes that NAVTEX messages were
properly received for some time after initial installation.
Symptom
Suggested Solution
No messages can be received
except for warning messages.
No NAVTEX messages can be received,
except for navigational warnings,
weather warnings, SAR/piracy/armed
robbery warnings or other warnings.
1. Check the message rejection settings by
pressing
.
2. Select all message types you wish to
receive, via the steps given in paragraph
4.8.2.
No messages can be received from
desired transmitters.
No NAVTEX messages can be received
from some transmitters at any time
even if you are within the coverage
areas.
1.
Check the current station rejection
settings by pressing
.
2. Select all IDs of transmitters from which
you wish to receive, via the steps given in
paragraph 4.8.1.
No messages can be received
despite correct selection settings.
No NAVTEX messages can be received
regardless of the correct selection
settings for all desired messages or
transmitters.
1. Check if the appropriate antenna is
correctly plugged into the appropriate
rear apron antenna (BNC) connector.
2. Run the self–diagnostic tests via the steps
given in paragraph 4.12, and check if the
receiver test result is “
OK
.”
If the test result indication shows
“
FAILED
,” suspect that the corresponding
receiver PCB has become defective. Ask
your dealer or qualified engineer to check
all wiring harnesses to/ from the PCB and
to replace the PCB if necessary.
3. Check if you are located within the service
area covered by the ground wave of the
desired station. The ground wave
coverage normally extends to 200 – 400
nautical miles from each station during
daytime hours.
4. Check the broadcast schedule of the
desired station. Each station usually
transmits for 5 to 10 minutes at
intervals of 4 hours.
5. Check the active antenna unit and/or
cabling by replacement.
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continued on next page
)