Garmin GTN 725 Pilot's Manual page 491

16.9 Backlight Settings
The backlighting of the display and bezel keys can be adjusted automatically
or manually. The default setting (automatic backlighting adjustment) uses
photocell technology to automatically adjust for ambient lighting conditions.
Photocell calibration curves are pre-configured to optimize display appearance
through a broad range of cockpit lighting conditions. A manual offset creates
a deviation form the normal curve. Manual adjustments may be made from
+100% to -10%. The negative adjustment is limited to prevent the backlight
from being accidently decreasing the backlight to the point where the display of
information could not be seen.
The backlight offset function is not available when a dimmer input is active.
The GTN is capable of accepting lighting inputs from the built-in photocell,
aircraft dimmer bus, or both. If the lighting is not satisfactory, contact the
installer to adjust the curves.
Manual backlighting adjustment can be accomplished using the existing
instrument panel dimmer bus or the following procedures.
1. While viewing the System page, touch the Backlight key.
2. Touch the Arrow keys to adjust the Backlight level.
3. After making the desired selections, touch the Back key to
return to the System page.
190-01007-03 Rev. D
Figure 16-39 Backlight Level Selection
Garmin GTN 725/750 Pilot's Guide
Touch The Arrow Keys
For Manual Offset
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