Table 5-3 Com Alert Troubleshooting Guide - Garmin GTN Xi Series Maintenance Manual

5.3.1.1 COM Related Alerts
Alert Text
COM RADIO - COM
radio needs service.
COM RADIO - COM
radio may be
inoperative.
REMOTE KEY
STUCK - COM push-
to-talk key is stuck.
REMOTE KEY
STUCK - COM
remote transfer key is
stuck.
REMOTE KEY
STUCK - COM
remote frequency
increment key is
stuck.
190-01007-C1
Rev. 1

Table 5-3 COM Alert Troubleshooting Guide

Possible Cause
A failure has been detected in
the COM transceiver. The
transceiver may still be
usable.
The GTN Xi is not able to
communicate with its COM
transceiver.
The COM push-to-talk
switch is stuck in the enabled
or pressed state.
The COM remote transfer
key is stuck in the enabled or
pressed state.
The COM remote frequency
increment key is stuck in the
enabled or pressed state.
Corrective Action
This message may appear after operations in
Configuration mode. Cycle power to the entire
GTN Xi (both GPS/NAV and COM circuit
breakers) and see if the message has cleared.
Contact Garmin technical support.
Verify that COM connector pins P1003-43 and
P1003-44 are receiving aircraft power.
Verify that COM connector pins P1003-37 and
P1003-38 are connected to aircraft ground.
If the message persists, contact Garmin
technical support.
Press the PTT switch to cycle its operation.
Navigate to the GTN Diagnostics > Discrete
Inputs page in Configuration mode and check
that the state of the input changes when the
PTT switch is pressed and released.
Verify that the PTT switch wiring is correct.
If the message persists, contact Garmin
technical support.
Press the COM remote transfer switch to
cycle its operation.
Navigate to the GTN Diagnostics > Discrete
Inputs page in Configuration mode and check
that the state of the input changes when the
COM remote transfer switch is pressed and
released.
Verify that the COM remote transfer switch
wiring is correct.
If the problem persists, contact Garmin
technical support.
Press the COM remote frequency
increment key to cycle its operation.
Navigate to the GTN Diagnostics > Discrete
Inputs page in Configuration mode and check
that the state of the input changes when the
COM remote frequency increment switch is
pressed and released.
Verify that the COM remote frequency
increment switch wiring is correct.
If the problem persists, contact Garmin
technical support.
GTN Xi Part 23 AML STC Maintenance Manual
Page 5-11