Table 4-3. Com Alert Troubleshooting Guide - Garmin GTN 6 series Maintenance Manual

4.3.1.1 COM Related Alerts
Alert Text
COM RADIO - COM radio
needs service.
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.
REMOTE KEY STUCK -
COM remote frequency
decrement key is stuck.
190-01007-B1
Rev. 1

Table 4-3. COM Alert Troubleshooting Guide

Possible Cause
A failure has been detected in
the COM transceiver. The
transceiver may still be
usable.
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.
COM remote frequency
decrement 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 (both GPS/NAV and COM circuit breakers) and see if the message has cleared.
Contact Garmin Product Support.
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.
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.
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.
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.
GTN 6XX/7XX Part 27 AML STC Maintenance Manual
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