Garmin GTN 6 series Maintenance Manual - page 40
GTN 6XX/7XX Part 27 AML STC Maintenance Manual
190-01007-B1
Page 4-8
Rev. 1
COM RADIO - COM
overtemp or undervoltage.
Reducing transmitter power.
The COM is reporting a high
temperature.
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).
COM RADIO - COM locked to
121.5 MHz. Hold remote
COM transfer key to exit.
The COM remote transfer
switch has been pressed for
at least two seconds.
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 two seconds.
Table 4-3. COM Alert Troubleshooting Guide
Alert Text
Possible Cause
Corrective Action