Garmin GNC 420AW Installation Manual - page 128
Page 6-4
400W Series Installation Manual
Rev. F
190-00356-02
6.2
58B
Alert Text Troubleshooting Procedure
464H
Table 6-2 is a list of alerts that are relevant to installers. There are additional messages in the 400W/500W
Pilot’s Guide. If a message is displayed that is not in
465H
Table 6-2 or the Pilot’s Guide, please contact
Garmin technical support.
Table 6-2. Alert Text Troubleshooting Guide
Alert Text
Possible Cause
Solution
Airport database integrity error
• The 400W Series unit has
detected a problem with a
database on the NavData
card. The message
“
integrity error” indicates the
database in error.
• The data is not usable. Try
reloading the information onto
the card. If that does not solve
the problem, replace the card.
Basemap database integrity error
• The 400W Series unit has
detected a failure in the built-in
basemap (land data)
database. Land data does not
appear on the Map Page.
Other unit functions continue
to work normally.
• Reload the basemap database
Boot block verify failed - Return
unit for repair
• System integrity testing has
determined that the boot block
has become corrupted.
• Contact Garmin technical
support.
CDI key stuck
• The CDI key is stuck in the
enabled (or “pressed”) state.
Try pressing the CDI key
again to cycle its operation.
• Contact Garmin technical
support.
CDI key disabled
• “Ignore CDI key” has been
selected on the MAIN
CDI/OBS CONFIG page.
• Go to the MAIN CDI/OBS
CONFIG page and deselect
“Ignore CDI key”
Check unit cooling
• The 400W Series unit has
detected excessive display
backlighting temperature. The
backlighting has been
automatically dimmed to
reduce the temperature.
• Check for adequate ventilation
or check cooling airflow. Refer
to Section 2.7 of the
installation manual.
COM has failed
(430W only)
• The unit has detected a failure
in its communications
transceiver.
• Contact Garmin technical
support.
• Contact Garmin technical
support
COM is not responding
(430W only)
• Internal system-to-system
communication between the
main processor and the COM
transceiver has failed.
Operational status of the COM
transceiver is unknown.
• If the COM board is still
working, it will automatically
tune to 121.500 MHz.
Transmit and receive functions
may still operate regardless of
the displayed frequency.
COM needs service
(430W only)
• The unit has detected a failure
in its communications
transceiver. The COM
transceiver may still be usable.
• Contact Garmin technical
support