System Maintenance Manual

Page 5-42 G1000/GFC700 System Maintenance Manual – C90A/C90GT/C90GTi King Air
Revision F 190-00682-01
Control Processor
The control processor contains the logs that are found in these processors –
3 – Pitch Servo
5 – Roll Servo
7 - Yaw
9 – Pitch Trim Servo
There are two main groupings of faults that can occur in the control processor.
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.
The second grouping of faults can occur during normal mode. These faults generally cause a
disconnect of power to the GSA and report to the GIA that a fault has occurred.
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
CONTROL PFT STEP NOTES
"INT COMM TEST FAIL"
This can sometimes be a result of a failure on the other board, check
faults on other processor
"CTL MOT PWR ON FAIL" Check unit power and AP Disconnect power
"MON MOT PWR ON FAIL" Check unit power and AP Disconnect power
"HALL 1 FAIL" Check unit power and AP Disconnect power
"HALL 2 FAIL" Check unit power and AP Disconnect power
"HALL 3 FAIL" Check unit power and AP Disconnect power
"HALL 4 FAIL" Check unit power and AP Disconnect power
"HALL 5 FAIL" Check unit power and AP Disconnect power
"HALL 6 FAIL" Check unit power and AP Disconnect power
"CURR OFFST FAIL" Check unit power and AP Disconnect power
"SVO TYPE FAIL" Check unit power and AP Disconnect power
"CERT DATA UNINSTALLED" Upload the certification gain file to the Control board
"STRAP CODE MISMATCH" Check the connector strap inputs to the unit