Garmin MX20 Installation Manual - 5 Troubleshooting
Troubleshooting
MX20 Installation Manual
57
5 Troubleshooting
This section provides information to assist troubleshooting if problems occur after completing the
installation. Use Table 5-1 to assist in troubleshooting.
5.1 Troubleshooting Guide
Table 5-1. Troubleshooting Guide
Problem Cause
Solution
1. Improper wiring; circuit breaker
open.
1. Ensure power is properly wired to
the MX20 and the circuit breaker
is closed.
2. Unit intensity turned down.
2. Ensure that unit is not in manual
intensity control mode with the
intensity turned down.
3. Unit is cold.
3. If ambient temperature is below
10
o
C, allow unit to preheat for up
to 60 seconds.
Unit does not power up – blank
screen.
4. Data card improperly installed.
4. Ensure that the data card is fully
inserted in the front bezel (It should
be flush with the ejector button).
Unit fails during power-on self-
test (POST).
1. Data card improperly installed.
1. Ensure that the data card is fully
inserted in the front bezel (It
should be flush with the ejector
button).
1. Improper key sequence entered.
1. Ensure that the proper installation
key sequence is carefully entered
after the power on self-test is
complete.
2. Too many keys pressed in key
sequence.
2. Ensure that no other keys are
pressed prior to entering the
sequence.
INST function not shown in
install mode.
3. Cycle through functions not
completed.
3.
Cycle through the available
functions by pressing the FN key
– INST function is on last
available function page.
1. Data port information not correct. 1. Ensure that the data port
configuration is correct and
matches how the unit is wired for
the position source.
2. Antenna cables improperly
installed.
2. Ensure that the GPS antenna
cables are correctly installed on
the external GPS and the internal
GPS (if equipped).
Unit shows POS data flag.
3. Antenna is improperly installed.
3. Ensure that the GPS antenna is
correctly installed on top of
aircraft and aircraft is clear of
hangars, buildings and trees.