Garmin SA01456Wi_D Manual Page 203

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G1000/GFC700 System Maintenance Manual – C90A/C90GT/C90GTi King Air Page 5-79
190-00682-01 Revision F
5.19 GCU 475 Troubleshooting
5.19.1 GCU 475 Alerts and Problems
Failure Message Cause Solutions
GCU CNFG – GCU Config error.
Config service req’d.
The G1000 has detected a
GCU 475 configuration
mismatch.
Load GCU configuration files,
Replace GCU.
If problem persists, replace
master configuration
module, check config
module wiring for faults
and replace if necessary.
NOTE
New Terrain/Obstacle cards,
Jeppesen Aviation Database and
other optional features (i.e.
TAWS unlock card) will need to
be replaced if the master
configuration module is changed.
The G1000 System ID number
will change to a new number
when installing a new master
config module. The old Terrain
and other cards will no longer
work as they will remain locked
to the old System ID number.
GCU FAIL – GCU is inoperative.
The G1000 has detected a
failure in the GCU 475.
Check wiring for faults (ref Failed
Path troubleshooting section).
Replace the GCU 475.
MANIFEST – GCU software
mismatch. Communication halted.
The system has detected an
incorrect software version
loaded in GCU 475.
Load the correct software version.
See Section 3.9 for the Software
Load Procedure.
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