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G1000 System Maintenance Manual
Page 5-109
190-00903-00
Rev.
A
5.1.9.5 Servo Troubleshooting
Whenever a servo fault occurs, a status message is logged to the corresponding servo control or
monitor maintenance log. This information is also accompanied by a time and date stamp. An
“RTC DATE” entry is made every time a servo is powered on, it is normally not useful for
troubleshooting.
The following is a listing of possible faults that could be reported in a GSA fault log. Faults can
occur in either the monitor board processor or the control board processor, both of which are
contained in the GSA unit.
Monitor Processor
The monitor processor contains the logs that are found in these processors:
2 - Pitch Servo
4 - Roll Servo
6 - Yaw
8 - Pitch Trim Servo
10 - Roll Trim Servo
12 - Yaw Trim Servo
There are two main groupings of faults that can occur in the monitor processor:
a.
The first grouping of faults can occur during the GSA unit pre-flight test (PFT). If there
is a fault during PFT the unit will not be able to transition to normal mode and the only
way to clear this state would be to cycle unit power.
b.
The second grouping of faults can occur during normal mode. These faults generally
cause a disconnect of power to the GSA and report that a fault has occurred to the GIA.
c.
The Notes column indicates any actions that can be taken to troubleshoot the problem in
the aircraft by the technician. Any faults that are not listed here indicate an internal
problem requiring replacement of the servo. If the items in the Notes column check out
ok, replace the servo.
PFT Faults
MONITOR PFT STEP
NOTES
"INTERNAL COMM FAIL"
This can sometimes be a result of a failure on the other internal servo
board, check faults on the other processor
"UNSW POWER INV"
Check unit power
"MON SOL PWR ON FAIL"
Check unit power and AP Disconnect power
"CTL SOL PWR ON FAIL"
Check unit power and AP Disconnect power
"SOL PWR FAIL"
Check unit power and AP Disconnect power
"CERT DATA
UNINSTALLED"
Upload the certification gain file to the Monitor board
"STRAP CODE MISMATCH" Check the connector strap inputs to the unit
