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Page 5-70
G1000 System Maintenance Manual
Rev. A
190-00903-00
5.1.7.2 GIA 63W
Symptom Recommended
Actions
Weak COM transmit power
•
Swap GIA1 and GIA2, reconfigure both GIA’s to their new
locations to verify the unit or aircraft wiring is the problem.
•
If problem follows unit, replace GIA.
•
If problem does not follow unit, check COM antenna and
cabling for faults.
Weak COM receiver
•
Swap GIA1 and GIA2, reconfigure both GIA’s to their new
locations to verify the unit or aircraft wiring is the problem.
•
If problem follows unit, replace GIA.
•
If problem does not follow unit, check COM antenna and
cabling for faults.
No COM sidetone
•
Swap GIA1 and GIA2, reconfigure both GIA’s to their new
locations to verify the unit or aircraft wiring is the problem.
•
If problem follows unit, replace GIA.
•
If problem persists, replace 1347D # with a known good unit.
•
If problem persists, reinstall original 1347D #1 and replace
1347D #2.
COM Bleed over
•
Verify on the GMA CONFIGURATION page that “Disable Split
COM” has a green box. Due to the closeness of the COM
antennas and high power of the COM transceivers, Split COM
operation is not approved.
•
If the box is black (indicating COM ½ button is active), highlight
“Disable Split COM” with the curser and press the ENT key to
turn the box green which will deactivate Split COM mode.
