
G1000 System Maintenance Manual – Diamond DA40/40F Page 5-49
190-00545-01 Revision G
5.8.7 GMA Common Problems
Table 5-31. GMA Common Problems
Symptom Recommended Action
Noise in Audio
Remove unit and check for MOD 1 marking.
9 If MOD 1 is not marked, replace GMA.
Most often the cause of the noise is external to the GMA. Try the following to
locate the source of the noise:
Try a different pair of headsets. Noise cancelling headsets may pick up and/or
generate more noise than standard headsets from their own circuitry.
Check for noise with engine turned off.
9 If the noise is present only when the engine is running, check the
alternator and/or ignition system as possible sources of noise (see
applicable airframe specific maintenance manual).
Check for noise as all electrical equipment is turned on and off (strobes, other
radios, etc.)
9 If the noise is identified from one electrical system or component refer
to the applicable airframe specific maintenance manual
Ensure the NAV/COM squelch is not open
Ensure the ADF and DME audio is not active
Ensure the marker beacon audio is not active
Ensure the ICS squelch is not open
9 Master squelch level can be adjusted on the GMA CONFIGURATION
page for higher noise environments
Replace unit only after all possible external sources of noise are eliminated
5.8.8 GMA Alerts
Table 5-32. GMA Alerts
Failure Message Cause Solution
GMA1 SERVICE – GMA1 needs
service. Return unit for repair.
The system has determined that
the GMA 1347 needs service.
Replace GMA 1347.
GMA1 FAIL – GMA1 in
inoperative.
The system has detected a failure
in the GMA 1347.
Ensure GMA1 is receiving power
Ensure both GIAs are receiving power
Ensure all GDUs are receiving power
Ensure the GMA/GIA RS-232 data lines
are working properly
Ensure the GIA/GDU Ethernet data
lines are working properly:
9 Replace GMA
MANIFEST – GMA1 software
mismatch. Communication
Halted.
The system has detected an
incorrect software version loaded
in GMA 1347.
See Section 3.5 for the software loading
procedure.
GMA1 CONFIG – GMA1
configuration error. Config service
req’d.
The system has detected a
GMA 1347 configuration
mismatch.
See Section 3.5 for the configuration
loading procedure.
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