Garmin GNS 480 Installation Manual page 108

Post-Installation Configuration & Checkout
3.3.2.4 Interface Checkout
This section describes checks that can be carried out to verify that systems interfacing to the GNS 480
are communicating properly.
3.3.2.4.1 GNS 480 Message Audio
The GNS 480 can annunciate audio messages through an audio panel. This check verifies that the audio
connection from the GNS 480 to the audio panel is functional. Prior to proceeding with this check,
ensure that the audio panel is set to annunciate the GNS 480 message audio. If the following steps do not
perform correctly, check the electrical connections and AMA volume setting.
1. Go to the System Configuration page. This page is accessed by pressing the FN key repeatedly until
the SYS smart key is displayed. The SYS smart key is then pressed, followed by the CNFG smart
key, if necessary.
2. While on the System Configuration page, rotate the large, outer knob to scroll down to the Msg Tone item
and verify that it is set to ON. If it is set to OFF, push the small, inner knob in to edit the setting and rotate the
small, inner knob to change the setting to ON. Press the MENU/ENTER key to accept the setting.
3. Rotate the large, outer knob and scroll up to the Mag Var setting. Press the small, inner knob in to edit
the setting and rotate the small, inner knob to change the setting to MANUAL. As soon as the setting is
changed to MANUAL the GNS 480 will display a "Using Manual Mag Var" message and play the message
tone. Verify that this tone is heard over the audio system.
4. If necessary, adjust the Message Audio volume level as described below and replay the tone to verify the new
setting.
5. Return the Mag Var setting to AUTO.
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