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Fault Type
Fault Name
+12.5V Monitor
-12.5V Monitor
+8V RF Monitor
-6V RF Monitor
+5.75V RF Monitor
Electrical
+5.75V Monitor
+3.3V Monitor
+1.9V Monitor
Current Monitor
+12.5V RF Monitor
+80V Backup Monitor
Suspended
Power Fail
DDS
TX PLL Lock
LO PLL Lock
Radio HW
Auto RF Self-Test
Main RF Self-Test
190-01277-00
Revision A
Table A-3 GRA 5500 Fault Descriptions
Description
Cause
Aircraft power input
+12.5 V power rail
voltage out of range
outputs improper
Internal power supply
voltage
failure
Aircraft power input
-12.5 V power rail
voltage out of range
outputs improper
Internal power supply
voltage
failure
Aircraft power input
+8 V RF power rail
voltage out of range
outputs improper
Internal power supply
voltage
failure
Aircraft power input
-6 V RF power rail
voltage out of range
outputs improper
Internal power supply
voltage
failure
Aircraft power input
+5.75 V RF power
voltage out of range
rail outputs improper
Internal power supply
voltage
failure
Aircraft power input
+5.75 V power rail
voltage out of range
outputs improper
Internal power supply
voltage
failure
Aircraft power input
+3.3 V power rail
voltage out of range
outputs improper
Internal power supply
voltage
failure
Aircraft power input
+1.9 V power rail
voltage out of range
outputs improper
Internal power supply
voltage
failure
Aircraft power input
voltage out of range
Improper current on
+8 V power rail
Internal power supply
failure
Aircraft power input
+12.5 V RF power
out of range
rail outputs improper
Internal power supply
voltage
failure
Aircraft power input
+80 V backup power
voltage out of range
rail outputs improper
Internal power supply
voltage
failure
Aircraft power lost for
Aircraft power failure
greater than 220 ms
Failure to program
DDS or read back
Internal
correct register
communication error
information from the
DDS
The TX PLL is not
locked while the unit
Internal failure
is transmitting.
The LO PLL is not
locked while the unit
Internal failure
is transmitting
Improper antenna
The self-test signal is
connections
not within the
acceptable frequency
Internal failure
range
Improper antenna
The self-test signal is
connections
not within the
acceptable frequency
Internal failure
range
(continued on next page)
Resolution
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.
If fault persists, download the assert log and send to
Garmin for diagnosis.
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.
If fault persists, download the assert log and send to
Garmin for diagnosis.
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.
If fault persists, download the assert log and send to
Garmin for diagnosis.
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.
If fault persists, download the assert log and send to
Garmin for diagnosis.
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.
If fault persists, download the assert log and send to
Garmin for diagnosis.
Check aircraft power supply. Cycle power to unit.
If fault persists, download the assert log and send to
Garmin for diagnosis.
Return power to unit. Note there are no assert log
entries for this fault.
Cycle power to unit. If fault persists, return unit to
Garmin for service.
If fault persists, download the assert log and send to
Garmin for diagnosis.
If fault persists, download the assert log and send to
Garmin for diagnosis.
Check antenna installation and all cable
connections.
If fault persists, download the assert log and send to
Garmin for diagnosis.
Check antenna installation and all cable
connections.
Download the assert log and send to Garmin for
diagnosis. If fault persists, return unit to Garmin for
service.
GRA 5500 Installation Manual
Page A-5
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