Gma 35 Troubleshooting Guide; Gma 35 System Messages; Table 4-11. Gma 35 Troubleshooting Guide; Table 4-12. Remote Audio Panel Alert Troubleshooting Guide - Garmin GTN 6 series Maintenance Manual

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.
Problem
Audio volume, audio routing,
music, marker beacon status,
or intercom are not working
properly.
Audio panel operates only in
fail-safe mode (pilot headset
connected to one COM radio,
red X over the audio panel
control field).
Automatic Speech
Recognition (ASR) is not
functioning.
4.4.3

GMA 35 System Messages

Alert Text
AUDIO PANEL - Audio panel
needs service.
AUDIO PANEL - Audio panel
is inoperative or connection to
GTN is lost.
GTN 6XX/7XX Part 27 AML STC Maintenance Manual
Page 4-16

Table 4-11. GMA 35 Troubleshooting Guide

Possible Cause
GMA 35 is not configured properly.
GMA 35 is disconnected from rotorcraft power
or ground.
GMA 35 is not seated correctly.
RS-232 communication between the
GTN 7XX and the GMA 35 is not functioning
correctly.
ASR is not enabled.
Problems with the Push-To-Command (PTC)
switch or wiring from the PTC switch to the
GMA 35.

Table 4-12. Remote Audio Panel Alert Troubleshooting Guide

Possible Cause
Audio panel should be serviced.
Audio panel is not powered up.
Audio panel has failed.
Wiring connections are incorrect.
Corrective Action
Check the configuration against the configuration log to ensure that the
GMA 35 is configured properly.
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.
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.
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.
Check the configuration of the controlling GTN 7XX to ensure that Voice
Command under Main System Configuration is 'Enabled'.
Check the PTC switch for proper operation.
Inspect the wiring from the PTC switch to the GMA 35.
Corrective Action
Return audio panel to Garmin for service.
Ensure the audio panel is receiving power and connected to ground.
Verify the wiring from the audio panel to the GTN.
190-01007-B1
Rev. 1