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NT-2000 REF Manual
User-Level Troubleshooting
5-7
5 . 8 .
N o R e sp o n s e f r o m K e yp r e s s
The following description of the symptom assumes that your NAVTEX receiver was
properly working for some time after initial installation time.
Symptom
Suggested Solution
The NAVTEX receiver can be
turned on but does not respond to
any keypress.
1. Check to be sure that the power source
voltage is within the 11–36V range.
2. Reset the system, returning all settings to
the factory’s initial settings via the
procedure given in paragraph 4.14.
3. Suspect that the CPU PCB or the Key
PCB has become defective. Run the
self–diagnostic tests (as per paragraph
4.12), and check the result of the RAM
and ROM tests. If the either test result is
“
FAILED
,” ask your dealer/qualified
service engineer to check the related
connections to/from these PCBs first, and
to replace the CPU PCB and /or the Key
PCB, if necessary.
5 . 9 . N o
M e s s ag e
A l ar m I n d i c a t i o n
The following description of the symptom assumes that your NAVTEX receiver was
properly working for some time after initial installation time.
Symptom
Suggested Solution
No audible or visual alarm indication
is available when navigational
warnings ( type–A messages) or
meteorological warnings ( type–B
messages) are received.
The alarm function for type–A and type–B
messages are initially disabled. To turn it on,
refer to paragraph 4.13 for instructions.
No audible alarm indication is
available when a Search & Rescue
( SAR ) or distress message is
received.
1. Run the self–diagnostic tests as per the
steps given in paragraph 4.12, and check
the result of the alarm test.
If no beep is heard on completion of the
test, suspect that a fault has developed in
the wiring harness to/from the message
buzzer or the buzzer has become defective
.
Ask your dealer/qualified engineer to
check the related wiring harnesses and
the buzzer.
2. Suspect that the CPU PCB has become
faulty.
Run the self–diagnostic tests and
check the result of the RAM and ROM
tests. If the result is “
FAILED
,” ask your
dealer/qualified engineer to check the
PCB by replacing.