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Table A-4 identifies the various unit faults that can be encountered during the initial Power On Self-Test (POST) of the GRA 5500. Use
Table A-4 as a reference to determine the proper actions after a fault has been identified.
POST Fault
Description
ADC used to monitor
ADC Monitor 0
internal unit voltages fails
self-test
ADC used to monitor
ADC Monitor 1
internal unit voltages fails
self-test
ADC used to monitor
ADC Monitor 2
internal unit voltages fails
self-test
+12.5V RF
+12.5 V RF power rail
outputs improper voltage
Monitor
+12.5 V power rail outputs
+12.5V Monitor
improper voltage
-12.5 V power rail outputs
-12.5V Monitor
improper voltage
+8 V RF power rail outputs
+8V RF Monitor
improper voltage
-6 V RF power rail outputs
-6V RF Monitor
improper voltage
+5.75V RF
+5.75 V RF power rail
Monitor
outputs improper voltage
+5.75 V power rail outputs
+5.75V Monitor
improper voltage
+3.3 V power rail outputs
+3.3V Monitor
improper voltage
+1.9 V power rail outputs
+1.9V Monitor
improper voltage
+80V Backup
+80 V backup power rail
Monitor
outputs improper voltage
Main board temperature
Main Temp
greater than 100° C or less
than -60° C
RF board temperature
RF Temp
greater than 100° C or less
than -60° C
190-01277-00
Revision A
Table A-4 "Various" POST (Power On Self-Test) Faults
Cause
Internal voltage monitor
failure
Internal voltage monitor
failure
Internal voltage monitor
failure
Aircraft power input
voltage out of range
Internal power supply
failure
Aircraft power input
voltage out of range
Internal power supply
failure
Aircraft power input
voltage out of range
Internal power supply
failure
Aircraft power input
voltage out of range
Internal power supply
failure
Aircraft power input
voltage out of range
Internal power supply
failure
Aircraft power input
voltage out of range
Internal power supply
failure
Aircraft power input
voltage out of range
Internal power supply
failure
Aircraft power input
voltage out of range
Internal power supply
failure
Aircraft power input
voltage out of range
Internal power supply
failure
Aircraft power input
voltage out of range
Internal power supply
failure
Installed unit location is
too hot/cold
Internal failure
Installed unit location is
too hot/cold
Internal failure
Resolution
Return unit to Garmin for service.
Return unit to Garmin for service.
Return unit to Garmin for service.
Check aircraft power supply. Cycle power to unit.
If fault persists, download the assert log and send to Garmin for diagnosis.
Check aircraft power supply. Cycle power to unit.
Download the assert log and send to Garmin for diagnosis. If fault persists,
return unit to Garmin for service.
Check aircraft power supply. Cycle power to unit.
Download the assert log and send to Garmin for diagnosis. If fault persists,
return unit to Garmin for service.
Check aircraft power supply. Cycle power to unit.
Download the assert log and send to Garmin for diagnosis. If fault persists,
return unit to Garmin for service.
Check aircraft power supply. Cycle power to unit.
Download the assert log and send to Garmin for diagnosis. If fault persists,
return unit to Garmin for service.
Check aircraft power supply. Cycle power to unit.
Download the assert log and send to Garmin for diagnosis. If fault persists,
return unit to Garmin for service.
Check aircraft power supply. Cycle power to unit.
Download the assert log and send to Garmin for diagnosis. If fault persists,
return unit to Garmin for service.
Check aircraft power supply. Cycle power to unit.
Download the assert log and send to Garmin for diagnosis. If fault persists,
return unit to Garmin for service.
Check aircraft power supply. Cycle power to unit.
Download the assert log and send to Garmin for diagnosis. If fault persists,
return unit to Garmin for service.
Check aircraft power supply. Cycle power to unit.
If fault persists, download the assert log and send to Garmin for diagnosis.
Return unit to qualified temperature range as specified in Environmental
Qualification Form (EQF). If fault persists, return unit to Garmin for
service.
Return unit to qualified temperature range as specified in Environmental
Qualification Form (EQF). If fault persists, return unit to Garmin for
service.
GRA 5500 Installation Manual
Page A-7
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