190-01007-C1
GTN Xi Part 23 AML STC Maintenance Manual
Rev. 1
Page 5-24
5.5 GMA 35 Troubleshooting
This section provides information to assist troubleshooting if problems occur after completing
maintenance. Refer to the system configuration log retained in the aircraft permanent records for a list of
interfaced equipment and system configuration data.
Table 5-14 GMA 35 Troubleshooting
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
Failsafe mode (pilot headset
connected to one COM radio,
red “X” over the audio panel
control field).
GMA 35 is disconnected from
aircraft 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 Xi and
the GMA 35 is not functioning
correctly.
Check for proper configuration of the
GTN Xi and GMA 35 RS-232 ports.
Check for correct wiring between the
audio panel and the GTN 7XX Xi.
Bluetooth isn’t working.
SMA cable loose at antenna
or on back of GMA 35c.
Ensure cable is tight at antenna and
back of GMA 35c.
Bluetooth disabled.
Enable Bluetooth under
Connext
Setup
>
GMA 35c
.
Unable to pair PED to
GMA 35c.
Trying to pair with the device
while not on the
GMA 35c
Pairing
page.
Access the
GMA 35c Pairing
page by
touching
Home
>
System
>
Connext
Setup
>
GMA 35c
. If GMA 35c is the
only Bluetooth device, touching
Connext Setup
will automatically
open
GMA 35c
page.
