AE–1800 Instruction Manual
User-Level Troubleshooting
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 displayed
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 current message rejection (
RJ
)
settings by pressing
.
2. Select all desired message types for
display and memory storage, via the steps
given in paragraph 4.9.
No messages can be displayed
from desired transmit ters.
No NAVTEX messages can be
displayed from some transmitters at
any time even if you are within the
coverage areas.
1. Check the current station rejection (
RJ
)
settings by pressing
.
2. Select the IDs of all desired transmitters
for display and storage in memory, via the
steps given in paragraph 4.8.
No messages can be displayed
despite correct selection set t ings
and appearance of “RCVNG MSG.”
No NAVTEX messages can be displayed
regardless of the correct display and
storage selection (
S L
) settings for all
desired messages or transmitters, or
regardless of the “RCVNG MSG”
status indication during reception.
1. The same message was received before or
the currently receiving message has a
character error rate (CER) > 33%.
See subparagraphs
④
,
⑪
and
⑫
in
paragraph 1.1 for details.
2. Run the self–diagnostic tests via the steps
given in paragraph 4.13, and check if the
receiver test result is “
OK
.”
If the test result indication shows
“
FAILED
,” suspect that the 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. The chance of any
receiver being out of tune is very small in
normal usage.
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 messages for 5 to 10 minutes at
intervals of 4 hours.
5. Check the active antenna unit and/or
cabling by replacement.
(
continued on next page
)
