Table 4-3 Gtn 7Xx System Messages - Garmin GTN 725 Maintenance Manual

Alert Text
COOLING - GTN
overtemp.
Reducing backlight
brightness.
COOLING FAN -
The cooling fan has
failed
CONFIGURATION
MODULE - GTN
configuration
module needs
service.
DEMO MODE -
Demo mode is
active. Do not use
for navigation.
GTN - GTN needs
service.
INTERNAL SD
CARD ERROR -
GTN needs
service.
INTERNAL SD
CARD REMOVED -
GTN needs
service.
KEY STUCK -
DIRECT-TO key is
stuck.
KEY STUCK -
HOME key is stuck.
KNOB STUCK -
Dual concentric
inner knob is stuck
in the pressed
position.
190-01007-01
Rev. 5

Table 4-3 GTN 7XX System Messages

Possible Cause
The GTN has detected
excessive display
backlighting temperature.
The backlight has been
automatically dimmed to
reduce the unit temperature.
The GTN has detected a
problem with the cooling fan.
The GTN configuration
module has failed.
The GTN is in Demo Mode
and must not be used for
actual navigation.
The GTN has detected an
internal failure.
The internal SD card has an
error.
The internal memory SD
card is malfunctioning or has
been removed.
The DIRECT-TO key is stuck
in the pressed state.
The HOME key is stuck in
the pressed state.
The inner large knob push-
key is stuck in the pressed
state. Knob is located on the
lower right corner of the
bezel.
Corrective Action
• Check the vents around the bezel are
unobstructed.
• Check adequate airflow around the unit.
• Check that the cooling fan is unobstructed.
• Check fan wiring. Refer to GTN 725/750 TSO
Installation Manual, P/N 190-01007-02 for
details.
• Replace the fan. Refer to section 5.3 for
details.
• If the message persists, replace the GTN.
Refer to section 5.1 for details.
• Check configuration module wiring. Refer to
GTN 725/750 TSO Installation Manual,
P/N 190-01007-02 for details.
• Replace the configuration module. Refer to
GTN 725/750 TSO Installation Manual,
P/N 190-01007-02 for details.
Check the DIRECT-TO key is not stuck or
pressed while the unit is being powered up.
Replace the GTN. Refer to section 5.1 for details.
Replace the GTN. Refer to section 5.1 for details.
Replace the GTN. Refer to section 5.1 for details.
• Press the DIRECT-TO key again to cycle its
operation.
• If the message persists, replace the GTN.
Refer to section 5.1 for details.
• Press the HOME key again to cycle its
operation.
• If the message persists, replace the GTN.
Refer to section 5.1 for details.
• Press the knob to cycle its operation.
• If the message persists, replace the GTN.
Refer to section 5.1 for details.
GTN 725/750 Maintenance Manual
Page 4-4