IFD5XX Installation Manual
600-00299-000
Page 179 of 198
Revision: 02
Appendix E: Troubleshooting Guide
Component
Trouble
Probable Cause
Solution
IFD5XX
The unit is not getting power to
the main connector
The unit is not getting power.
Check Circuit Breaker
Check wiring and unit seating in
tray
The IFD5XX is not computing a
position
Wiring
Check Coaxial Cables
Antenna
Verify antenna has a clear
unobstructed view of the sky
The GPS Signal levels are very
low
Wiring
Check coaxial cable and
connectors
Check routing
Antenna shading
Verify the antenna is mounted on
top of the aircraft
Verify antenna is clear of
hangars, buildings, etc.
Interference
Verify another piece of aircraft
equipment is not interfering with
the GPS system
VHF Com is not transmitting
Wiring
Check the aircraft’s PTT switch
Check Audio Panel (if installed)
Check wiring
The IFD5XX is not tuning the
DME
Configuration
Verify the IFD5XX is configured
correctly.
Wiring
Checking wiring
DME
Verify the DME is configured for
the IFD5XX tuning type
RS-232 Device is not
communicating
Configuration
Verify the IFD5XX is configured
for the appropriate device.
Wiring
Check wiring and unit seating in
tray
ARINC 429 is not communicating
Configuration
Verify the IFD5XX is configured
for the appropriate device.
Wiring
Check wiring and unit seating in
tray
Display appears excessively dim
or off
Configuration (configured for
“night mode”)
Check cockpit dimming rheostat
position
Summary of Contents for IFD540
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