System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
190-01007-A1
Page 5-12
Rev. 5
5.3.1.3 VLOC/GS Related Alerts
Table 5-5. VLOC/GS Alert Troubleshooting Guide
Alert Text
Possible Cause
Corrective Action
VLOC RECEIVER -
Navigation receiver needs
service.
The GTN 650/750 has detected a
failure in its navigation receiver.
Contact Garmin technical
support.
VLOC RECEIVER -
Navigation receiver has
failed.
The GTN 650/750 has detected
an internal failure in its VLOC
receiver.
Contact Garmin technical
support.
GLIDESLOPE - Glideslope
receiver needs service.
The GTN 650/750 has detected
an internal failure in its glideslope
receiver.
Contact Garmin technical
support.
GLIDESLOPE - Glideslope
receiver has failed.
The GTN has detected an
internal failure in its glideslope
receiver.
Contact Garmin technical
support.
REMOTE KEY STUCK -
NAV remote transfer key is
stuck.
NAV remote transfer key is stuck
in the enabled or pressed state.
Press the NAV remote transfer
switch to cycle its operation.
Go to the GTN DIAGNOSTICS -
DISCRETE INPUTS page in
configuration mode and check
that the state of the input
changes when the NAV remote
transfer switch is pressed and
released.
Verify that the NAV remote
transfer switch wiring is correct.
If the problem persists, contact
Garmin technical support.
