ADS-B FDL-978 Series and
Lite Series Installation Manual
Document No. 87343 Rev G
FFS Copyright © 2016 All rights reserved.
4-61
Warning
Potential Cause
Troubleshooting
TX Fault
Generic Transmitter Fault –
POST, transmit, address,
broadcast, or nominal rate
failure.
Cycle power on the FDL-978 Lite Series and
FDL-978-XVR.
Check for valid ICAO address config.
Tx Power Low
Transmitter power too low.
Check antennas and cabling.
Return for maintenance if problem persists.
Tx PSU High
Transmitter power supply
voltage too high.
Cycle power on the FDL-978 Lite Series and
FDL-978-XVR. Return for maintenance if
problem persists.
Tx PSU Low
Transmitter power supply
voltage too low.
Cycle power on the FDL-978 Lite Series and
FDL-978-XVR. Return for maintenance if
problem persists.
Squitter Fail
Transmitter modulation fault.
Cycle power on the FDL-978 Lite Series and
FDL-978-XVR. Return for maintenance if
problem persists.
Remote Hot
FDL-978-XVR internal
temperature too high.
Cycle power on the FDL-978 Lite Series and
FDL-978-XVR.
Turn power off for several minutes, then back
on.
Return for maintenance if problem persists.
No ADS-B Pos
The unit is not receiving
digital serial communication
from the GPS.
Verify GPS is functioning.
Verify GPS Port Configuration and speed.
Verify GPS communication connection.
GPS Fault
GPS has reported no
available position or a fault.
Verify GPS is functioning.
Verify GPS Antenna Cable connection.
Verify GPS Antenna installation/operation.
Top Ant Fault
Top antenna disconnected
Check UAT antenna connection.
Ensure antenna is DC grounded.
Disable DC Gnd Check in config if antennas
are not DC grounded.
Bottom Ant Fault
Bottom antenna disconnected
Check UAT antenna connection.
Ensure antenna is DC grounded.
Disable DC Gnd Check in config if antennas
are not DC grounded.
PSU Fail
Internal DC Power Supply
failure
Cycle power on the FDL-978 Lite Series and
FDL-978-XVR. Return for maintenance if
problem persists.
