Warning Messages; Tc978 Warning Message Troubleshooting - FreeFlight ADS-B FDL-978 Series Installation Manual

4.3

Warning Messages

If the FDL-978-XVR detects a malfunction, the
messages are present. Depending on the nature of the malfunction, the FDL-978-XVR may not
transmit ADS-B messages.
To enter the Warning View mode, press the FN button four times and WARNING will be
displayed top center along with a brief description of the fault. In this mode, the Controller
continually requests the active warning messages from the FDL-978-XVR and FDL-978 Lite
Series and displays them on the Controller. Press the FN button again to exit this mode and
return to normal operation.
Warning MSG
Synth Unlock
Tx Fault
Tx Power Low
Tx PSU High
Tx PSU Low
Squitter Fail
Remote Hot
No ADS-B Pos
GPS Fault
Top Ant Fault
Bot Ant Fault
PSU Fail
ADC Fault

4.3.1 TC978 Warning Message Troubleshooting

The following is a quick reference troubleshooting guide using the TC978 Warnings:
Warning
Synth Unlock Transmitter can't lock to carrier
frequency
TX Fault Generic Transmitter Fault –
POST, transmit, address,
broadcast, or nominal rate
failure.
FFS Copyright © 2015 All rights reserved.
MSG
TC978 Warning Messages
Transceiver Diagnostic – Timing Fault
UAT Transceiver fault
UAT Transceiver power low during transmit
UAT Transceiver power supply output too high
UAT Transceiver power supply output too low
System Diagnostic
FDL-978 Lite Series and FDL-978-XVR internal
temperature too high
The unit is not receiving digital serial communication from
the GPS.
GPS has reported unavailable position or a fault.
Top antenna disconnected
Bottom antenna disconnected
Internal DC power supply failure
ADC or Altitude sensor fault or not responding
Potential Cause
ADS-B FDL-978 Series and
Lite Series Installation Manual
Document No. 87343 Rev F
icon appears to indicate that warning
Description
Troubleshooting
Cycle power on the FDL-978 Lite Series and
FDL-978-XVR.
Return for maintenance if problem persists.
Cycle power on the FDL-978 Lite Series and
FDL-978-XVR.
Check for valid ICAO address config.
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