Garmin G1000 Maintenance Manual page 82

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5.6.3 NAV
Symptom
Weak NAV receiver
5.6.4 G/S
Symptom
Weak G/S receiver
5.6.5 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 5-46
Rev. B
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.
−
If problem does not follow unit, check NAV antenna, coupler,
and 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.
−
If problem does not follow unit, check NAV antenna, coupler,
and cabling for faults.
Cause
The system has
determined COM1 needs
service.
The system 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 GIA5.
•
Press the push-to-talk switch(s)
again to cycle its operation.
•
Check push-to-talk switch(s) and
wiring.
•
Switch GIA1 and GIA2, to verify
location of problem:
−
If problem follows the unit,
replace GIA1.
•
Check GIA1/GMA 1347
interconnect.
•
Replace GMA 1347.
•
Press the push-to-talk switch(s)
again to cycle its operation.
•
Check push-to-talk switch(s) and
wiring.
•
Switch GIA2 and GIA1, to verify
location of problem:
−
If problem follows the unit,
replace GIA5.
G1000 System Maintenance Manual
190-00907-00