Garmin GTN 6 series Maintenance Manual - page 39
190-01007-B1
GTN 6XX/7XX Part 27 AML STC Maintenance Manual
Rev. 1
Page 4-7
4.3.1.1
COM Related Alerts
Table 4-3. COM Alert Troubleshooting Guide
Alert Text
Possible Cause
Corrective Action
COM RADIO - COM radio
needs service.
A failure has been detected in
the COM transceiver. The
transceiver may still be
usable.
This message may appear after operations in configuration mode. Cycle power to the entire
GTN (both GPS/NAV and COM circuit breakers) and see if the message has cleared.
Contact Garmin Product Support.
REMOTE KEY STUCK -
COM push-to-talk key is
stuck.
The COM push-to-talk switch
is stuck in the enabled or
pressed state.
Press the PTT switch to cycle its operation.
If the message persists, contact Garmin Product Support.
Go 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.
REMOTE KEY STUCK -
COM remote transfer key is
stuck.
The COM remote transfer 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 transfer switch to cycle its operation.
If the problem persists, contact Garmin Product Support.
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 Product 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 Product Support.