G1000 NXi System Maintenance Manual
Page 144
King Air 300 Series
Revision 1
190-00716-N1
MFD1 RS-232
Channel
LRU
Indicator
Status
CHNL 1
GCU 477
Green
MFD1/GCU 477 data path is functioning correctly.
Red
MFD1/GCU 477 data path is not functioning correctly.
•
Verify GCU 477 is powered on.
o
If GCU 477 will not power on, remove unit and
verify power and ground are present at the
GCU connector.
If power or ground is not present,
troubleshoot aircraft wiring for faults.
If power and ground are present,
replace GCU 477.
•
Load MFD1 and GCU 477 configuration files.
•
Check the MFD1/GCU 477 interconnect wiring for
faults.
•
Replace GCU 477.
Replace MFD if problem remains.
Amber
MFD1/GCU data path functionality is unknown. Reload
MFD1 configuration file.