Garmin G1000 NAV III Line Maintenance Manual page 78

2.4.4 NAV
Symptom
Weak NAV receiver
2.4.5 G/S
Symptom
Weak G/S receiver
2.4.6 COM Related Alerts
Message
COM1 SERVICE – COM1 needs
service. Return unit for repair.
COM2 SERVICE – COM2 needs
service. Return unit for repair.
COM1 PTT – COM1 push-to-talk
key is stuck.
COM2 PTT – COM2 push-to-talk
key is stuck.
Page 2-50
Rev. L
Recommended Action
•
Set up a NAV/COM Ramp Test Set to radiate a test signal.
•
Switch GIA1 and GIA2, to verify location of problem:
If problem follows unit, replace GIA.
o
If problem does not follow unit, check NAV antenna, coupler, and
o
cabling for faults.
Recommended Action
•
Set up a NAV/COM Ramp Test Set to radiate a test signal.
•
Switch GIA1 and GIA2, to verify location of problem:
If problem follows unit, replace GIA.
o
If problem does not follow unit, check NAV antenna, coupler, and
o
cabling for faults.
Cause
The G1000 has determined
COM1 needs service.
The G1000 has determined
COM2 needs service.
The COM1 external push-to-
talk (PTT) switch is stuck in
the enabled (or "pressed")
state.
The COM2 external push-to-
talk (PTT) switch is stuck in
the enabled (or "pressed")
state.
Solutions
•
Replace GIA1
•
Replace GIA2
•
Press the push-to-talk switch(es) again
to cycle operation
•
Check push-to-talk switch(es) and
wiring
•
Check GIA1/GMA 1347 interconnect
•
Switch GIA1 and GIA2, to verify location
of problem:
If problem follows the unit, replace
o
GIA1.
If problem persists replace the GMA
o
1347.
•
Press the push-to-talk switch(es) again
to cycle operation
•
Check push-to-talk switch(s) and wiring
•
Check GIA2/GMA 1347 interconnect
•
Switch GIA1 and GIA2, to verify location
of problem:
If problem follows the unit, replace
o
GIA2.
If problem persists replace the GMA
o
1347.
G1000 Nav III Line Maintenance Manual
190-00352-00