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15-27190-01004-03 Rev. B
Garmin GTN 625/635/650 Pilot’s Guide
Foreword
Getting
Started
Xpdr Ctrl
Com/Nav
FPL
Direct-To
Proc
Wpt Info
Map
Traffic
Terrain
Weather
Nearest
Music
Utilities
System
Messages
Symbols
Appendix
Index
15.8 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.
Backlight Level.
Touch Arrows To Set
Manual Offset
Figure 15-37 Backlight Level Setting
2. Touch the Manual Offset Arrow keys to set the Manual
Offset level.
3. After making the desired selections, touch the Back key to
return to the Setup page.