Garmin GNS 480 Installation Manaul page 105

3.3.1.1.6 Bezel Key Test
The Bezel Key Test function verifies the operation of the bezel keys and knobs. While on the Ground
Maintenance TEST menu page, press the BEZEL KEYS line select key to go the Bezel Key Test page.
Follow the on-screen directions to press each one of the bezel keys and actuate the knobs. After
completing the bezel key test the results will be shown on the display. If a key / knob is not actuated for
ten seconds (30 seconds for the first key in the test sequence), the test will automatically advance to the
next key / knob and will show a FAIL message upon completion of the test. Repeat the test carefully to
ensure that the keys and knobs are actuated within the required time.
Once the Bezel Key Test is initiated it cannot be exited until every key and knob is
actuated or times out.
The bezel key test should be run upon initial installation or any time a problem is suspected with one of
the GNS 480 bezel keys or knobs.
GNS 480 (CNX80) Installation Manual
NOTE
Figure 3-25. Bezel Key Test
560-0982-01 Rev L
Post-Installation Configuration & Checkout
3-25