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190-01007-A1 System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Rev. 7 Page 5-10
REMOTE KEY STUCK
- COM remote
frequency increment
key is stuck.
The COM remote frequency increment
key is stuck in the enabled or pressed
state.
Go 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.
Press the COM remote frequency
increment key to cycle its operation.
If the problem persists, contact
Garmin technical support.
REMOTE KEY STUCK
- COM remote
frequency decrement
key is stuck.
COM remote frequency decrement key
is stuck in the enabled or pressed
state.
Press the COM remote frequency
decrement key to cycle its operation.
Go 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.
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.
Alert Text Possible Cause Corrective Action