16-30
GTN 725/750 Pilot’s Guide
190-01007-03 Rev. C
Foreword
Getting
Started
Audio &
Xpdr Ctrl
Com/Nav
FPL
Direct-To
Proc
Charts
Wpt Info
Map
Traffic
Terrain
Weather
Nearest
Services/
Music
Utilities
System
Messages
Symbols
Appendix
Index
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.
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.
Touch The Arrow Keys
For Manual Offset
Figure 16-38 Backlight Level Selection
3. After making the desired selections, touch the Back key to
return to the System page.
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