Garmin GNC 420AW Installation Manual - page 130
Page 6-6
400W Series Installation Manual
Rev. F
190-00356-02
Alert Text
Possible Cause
Solution
G/S is not responding
(430W only)
• Internal system-to-system
communication between the
main processor and the
glideslope receiver has failed.
Operational status of the
glideslope receiver is unknown.
• Contact Garmin technical
support.
G/S needs service
(430W only)
• The unit has detected a failure
in its glideslope receiver. The
glideslope receiver may still be
usable.
• Contact Garmin technical
support.
GAD configuration required
• The GAD 42 Interface Adapter
has lost the configuration
information stored in its internal
memory. Any mechanical
indicators connected to your
400W- series unit are unusable.
• Reconfigure the GAD 42 unit.
Refer the GAD 42 Installation
Manual (P/N 190-00159-00)
GAD needs service
• The 400 Series unit has
detected a failure in the GAD 42
interface adapter. Any
mechanical indicators
connected to your unit are
unusable.
• Refer to section 5.2.3 of the
GAD Installation Manual
(P/N 190-00159-00)
• Check for proper configuration
• Check wiring
GDL 69 is not responding
• No data is being received from
the GDL 69.
• Contact Garmin technical
support.
• GPS antenna cable is shorted.
• Verify that the center
conductor is not shorted to the
braid in the coaxial cable.
GPS is not responding
• Internal system-to-system
communication between the
main processor and the GPS
receiver has failed. Operational
status of the GPS receiver is
unknown.
• Contact Garmin technical
support.
GPS needs service
• The 400W Series unit has
detected a failure in its GPS
receiver.
• Contact Garmin technical
support.
• A valid value of magnetic
variation is not available for this
location.
Large magnetic variance
• Verify all course angles
• Contact Garmin technical
support.