Garmin MX20 Installation Manual - page 67
Troubleshooting
60
MX20 Installation Manual
Table 5-1. Troubleshooting Guide Cont’d
Problem Cause
Solution
1. Unit is not WSI sensor capable.
1. Ensure that the model MX20 is
WSI sensor capable.
2. Data port configuration incorrect 2. Ensure that the data port
configuration is correct and the
WSI sensor is set correctly.
3. WSI InFlight sensor function not
enabled.
3. Ensure that the WSI sensor
function is enabled.
4. WSI InFlight sensor not powered
up; not functioning properly.
4. Ensure that the WSI sensor has
power applied and is functional.
Unit shows LINK data flag.
5. Wiring connects are incorrect.
5. Verify wiring and pin connections.
1. Unit is not Traffic capable.
1. Ensure that the model MX20 is
traffic capable.
2. Data port configuration incorrect. 2. Ensure that the data port
configuration is correct and
matches how the unit is wired for
the serial interface.
3. Traffic function not enabled.
3. Ensure that the traffic function is
enabled.
4. Traffic unit not powered up; not
functioning properly.
4. Ensure that the Traffic unit has
power applied and is functional.
Unit shows TRAF data flag.
5. Wiring connections are incorrect. 5. Verify serial wiring and pin
connections.
1. The GDL 90 UAT internal GPS
receiver is reporting an invalid
position or is unable to compute a
position.
1. The ADSB data flag is displayed
at start-up during normal GPS
receiver signal acquisition. If the
data flag is displayed for more
than five minutes after the GDL
90 UAT is turned on and the GPS
antenna has a clear view of the
sky, refer to the troubleshooting
section of the GDL 90
Installation Manual.
Unit shows ADSB data flag.
2. The traffic unit is not a GDL 90
UAT.
2. Disable the GDL 90 selections in
the Install-Misc installation menu.
MX20 runs hot.
1. Arrangement of avionics and
installation area does not provide
sufficient airflow.
1. If an internal fan is present, verify
that it is operational and that the
opening is clear of obstructions.
The fans should turn on when the
unit's internal temperature is
approximately 95-100ºF. If an
internal fan is not present, one
may be installed by the factory.
Contact factory.