Garmin GTN 750 Pilot's Manual page 370

Message
Foreword
COM RADIO -
Getting
Com radio may be
Started
inoperative.
Audio &
Xpdr Ctrl
Com/Nav
COM RADIO -
FPL
Com overtemp
or undervoltage.
Direct-To
Reducing
transmitter power.
Proc
Charts
COM RADIO -
Wpt Info
Com locked to
121.5 MHz. Hold
Map
remote com
transfer key to exit.
Traffic
Terrain
CONFIGURATION
- Terrain/TAWS
Weather
configuration is
invalid. GTN needs
Nearest
service.
Music
CONFIGURATION
MODULE -
Utilities
GTN configuration
module needs
System
service.
Messages
Symbols
Appendix
17-4
Index
Description
The com radio is not
communicating properly
with the system.
Com radio is
in overtemp or
undervoltage mode
and transmitting power
has been reduced to
prevent damage to the
com radio. Radio range
will be reduced.
Com radio is locked to
121.5 MHz.
TAWS is inoperative
due to a configuration
problem with the GTN.
This message will be
accompanied by a TER
FAIL annunciation.
The GTN cannot
communicate with its
configuration module.
The GTN may still have
a valid configuration.
Garmin GTN 725/750 Pilot's Guide
Action
Press and hold the volume knob or
the external com remote transfer
(COM RMT XFR) switch, if installed
– this will force the com radio to
121.5 MHz. Contact dealer for
service.
Decrease length of com
transmissions, decrease cabin
temperature and increase cabin
airflow (especially near the GTN).
Check aircraft voltage and reduce
electrical load as necessary.
Contact dealer for service if this
message persists.
The external com remote transfer
(COM RMT XFR) switch has been
held and the com radio is tuned to
121.5. To exit this mode, hold the
com remote transfer (COM RMT
XFR) switch for two seconds.
Contact dealer for service.
Contact dealer for service.
190-01007-03 Rev. B