Installation manual
Troubleshooting
Apollo MX20 Installation Manual
51
4 TROUBLESHOOTING
This section provides information to assist troubleshooting if problems occur after completing the
installation. Use Table 10 to assist in troubleshooting.
4.1 TROUBLESHOOTING GUIDE
Table 10 - Troubleshooting Guide
Problem Cause Solution
Unit does not power up – blank
screen.
1. Improper wiring; circuit breaker
open.
2. Unit intensity turned down.
3. Unit is cold.
4. Data card improperly installed.
1. Ensure power is properly wired
to the MX20 and the circuit
breaker is closed.
2. Ensure that unit is not in manual
intensity control mode with the
intensity turned down.
3. If ambient temperature is below
10
o
C, allow unit to preheat for up
to 60 seconds.
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).
Data card improperly installed. Ensure that the data card is fully
inserted in the front bezel (It should
be flush with the ejector button).
INST function not shown in
install mode.
1. Improper key sequence entered.
2. Too many keys pressed in key
sequence.
3. Cycle through functions not
completed.
1. Ensure that the proper
installation key sequence is
carefully entered after the power
on self-test is complete.
2. Ensure that no other keys are
pressed prior to entering the
sequence.
3. Cycle through the available
functions by pressing the FN key
– INST function is on last
available function page.
Unit shows POS data flag. 1. Data port information not
correct.
2. Antenna cables improperly
installed.
3. Antenna is improperly installed.
4. Waypoint not selected as the
current destination.
1. Ensure that the data port
configuration is correct and
matches how the unit is wired for
the position source.
2. Ensure that the GPS antenna
cables are correctly installed on
the external GPS and the internal
GPS (if equipped).
3. Ensure that the GPS antenna is
correctly installed on top of
aircraft and aircraft is clear of
hangers, buildings and trees.
4. If a GX/SL series is used as the
position source, ensure that a
waypoint is selected as the
current destination (Nav Flagged