Garmin GTN Xi Series Maintenance Manual page 62

Alert Text
REMOTE KEY
STUCK - COM
remote frequency
decrement key is
stuck.
COM RADIO - COM
overtemp or
undervoltage.
Reducing transmitter
power.
COM RADIO - COM
locked to 121.5 MHz.
Hold remote COM
transfer key to exit.
190-01007-C1
Rev. 1
Possible Cause
COM remote frequency
decrement key is stuck in the
enabled or pressed state.
The COM is reporting a high
temperature.
The COM remote transfer
switch has been pressed for
at least 2 seconds.
Corrective Action
Press the COM remote frequency
decrement 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 decrement switch is
pressed and released.
Verify that the COM remote frequency
decrement switch wiring is correct.
If the problem persists, contact Garmin
technical support.
Ensure the fan is functioning properly and
check for adequate airflow around the unit.
Ensure that the COM radio is receiving
adequate input voltage (11-33 VDC).
In Lockout mode, the COM will tune the active
frequency to 121.5 MHz and not allow the
frequency to be changed. COM Lockout mode
can be exited by pressing the COM remote
transfer switch for at least 2 seconds.
GTN Xi Part 23 AML STC Maintenance Manual
Page 5-12