Table 4-12 Gma 35 Troubleshooting Guide; Gma 35 Troubleshooting Guide - Garmin GTN 6 Series Maintenance Manual

4.5.2

GMA 35 Troubleshooting Guide

If problems occur after completing maintenance, this section provides information to assist
troubleshooting. 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 GMA 35 is not configured
beacon status, or properly.
intercom are not
working properly.
GMA 35 is disconnected
from rotorcraft power or
Audio panel
ground.
operates only in
Fail-safe mode
GMA 35 is not seated
(pilot headset
correctly.
connected to one
COM radio, red
"X" over the audio
RS-232 communication
panel control
between the GTN 7XX and
field).
the GMA 35 is not
functioning correctly.
ASR is not enabled.
Automatic Speech
Recognition
Problems with the Push-To-
(ASR) is not
Command (PTC) switch or
functioning.
wiring from the PTC switch
to the GMA 35.
SMA cable is loose at
antenna or on back of the
Bluetooth not
GMA 35c.
working
Bluetooth disabled.
Unable to pair Trying to pair the device
device to the while not on the GMA 35c
GMA 35c Pairing page.
190-01007-B1
Rev. 4

Table 4-12 GMA 35 Troubleshooting Guide

Possible Cause
GTN 6XX/7XX Part 27 AML STC Maintenance Manual
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 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.
Ensure the cable is tight at the antenna and back
of the GMA 35c.
Enable Bluetooth under Connext Setup →
GMA 35c.
Access the GMA 35c Pairing page by touching
Home → System → Connext Setup →
GMA 35c. If the GMA 35c is the only Bluetooth
device, touching Connext Setup will automatically
open the GMA 35c Pairing page.
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