Garmin GTN 6 series Maintenance Manual - page 48
GTN 6XX/7XX Part 27 AML STC Maintenance Manual
190-01007-B1
Page 4-16
Rev. 1
4.4.2
GMA 35 Troubleshooting Guide
This section provides information to assist troubleshooting if problems occur after completing maintenance. Refer to the system configuration and checkout log
retained in the rotorcraft permanent records for a list of interfaced equipment and system configuration data.
4.4.3
GMA 35 System Messages
Table 4-12. Remote Audio Panel Alert Troubleshooting Guide
Table 4-11. GMA 35 Troubleshooting Guide
Problem
Possible Cause
Corrective Action
Audio volume, audio routing,
music, marker beacon status,
or intercom are not working
properly.
GMA 35 is not configured properly.
Check the configuration against the configuration log to ensure that the
GMA 35 is configured properly.
Audio panel operates only in
fail-safe mode (pilot headset
connected to one COM radio,
red X over the audio panel
control field).
GMA 35 is disconnected from rotorcraft power
or ground.
Ensure power is connected to P3502, pins 8 and 9, and ground is connected to
P3502, pins 10 and 11. Check circuit breakers and avionics switch.
GMA 35 is not seated correctly.
Verify that the GMA 35 is fully seated. Verify that counter-sunk flathead screws
are used to secure the GMA 35 connectors to the backplate.
RS-232 communication between the
GTN 7XX and the GMA 35 is not functioning
correctly.
Check for proper configuration of the GTN and GMA 35 RS-232 ports.
Check for correct wiring between the audio panel and the GTN 7XX.
Automatic Speech
Recognition (ASR) is not
functioning.
ASR is not enabled.
Check the configuration of the controlling GTN 7XX to ensure that Voice
Command under Main System Configuration is ‘Enabled’.
Problems with the Push-To-Command (PTC)
switch or wiring from the PTC switch to the
GMA 35.
Check the PTC switch for proper operation.
Inspect the wiring from the PTC switch to the GMA 35.
Alert Text
Possible Cause
Corrective Action
AUDIO PANEL - Audio panel
needs service.
Audio panel should be serviced.
Return audio panel to Garmin for service.
AUDIO PANEL - Audio panel
is inoperative or connection to
GTN is lost.
Audio panel is not powered up.
Ensure the audio panel is receiving power and connected to ground.
Audio panel has failed.
Verify the wiring from the audio panel to the GTN.
Wiring connections are incorrect.