Eventide ARGUS 5000 - Page 181

PROBLEM: Selftest ends with a failure message.
Cycle power a few times to confirm that the message is repeatable, and make a note
of it! If the message is anything other than NVRAM FAILED, the unit must be
returned. If the problem is with NVRAM, and the message only occurs once, it means
that you have lost your SETUP and AMEND data but the unit otherwise is probably
OK. In this case you will have to re-enter your information.
PROBLEM: Selftest passes normally, but I get a message "LRN DATA LOST."
This means that the Argus is receiving NO data from the receiver. Confirm that the
GPS is powered up and that it has acquired. This is almost always a problem with the
GPS or with the wiring between the units. Your installation agency can confirm that
no data is reaching the Argus.
PROBLEM: I get a message "LRN NAV INVALID, LRN COMM FAULT, or
WRONG LRN SELECTED."
(■• Confirm that the GPS is powered up and has acquired and is tracking. If this is an
initial installation, confirm that the installation agency set the Argus for the correct
model Loran, and that the communication parameters are correct. If a new accessory
(such as a fuel-flow indicator) has just been installed, it may be necessary to readjust
the communications parameters so that the GPS, accessory, and Argus all agree. If
everything was working and suddenly stopped, it may mean that either the setup
information in the GPS or in the Argus changed. (If you got an NVRAM FAILED
message on the Argus, it changed in the Argus. If you didn't, it probably changed in
the GPS.) If the Argus operating system has been changed, then check the LRN in
SETUP.
A more remote possibility is that there is a hardware defect in the GPS or Argus that
is corrupting the data. Have a competent avionics shop check the data signal with an
oscilloscope. The "LRN NAV INVALID", "LRN COMM FAULT" or "WRONG
LRN SELECTED" message almost never indicates a hardware defect in the Argus.
These messages are covered in more detail in the Setup section.
July 1999 Argus 5000/7000 Ver. 5.xx Reference Manual Part#141003 177