Garmin GTN 650 Pilot's Guide - Page 305
Backlight Settings
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15.8 Backlight Settings Foreword The backlighting of the display and bezel keys can be adjusted automatically or manually. The default setting (automatic backlighting adjustment) uses Getting Started photocell technology to automatically adjust for ambient lighting conditions. Photocell calibration curves are pre-configured to optimize display appearance Xpdr Ctrl through a broad range of cockpit lighting conditions. A manual offset creates a deviation form the normal curve. Manual adjustments may be made from Com/Nav +100% to -10%. The negative adjustment is limited to prevent the backlight FPL from being accidently decreasing the backlight to the point where the display of information could not be seen. Direct-To Manual backlighting adjustment can be accomplished using the existing instrument panel dimmer bus or the following procedures. Proc 1. While viewing the System page, touch the Backlight key. Wpt Info Map Backlight Level. Traffic Touch Arrows To Set Manual Offset Terrain Weather Nearest Figure 15-37 Backlight Level Setting 2. Touch the Manual Offset Arrow keys to set the Manual Music Offset level. Utilities 3. After making the desired selections, touch the Back key to return to the Setup page. System Messages Symbols Appendix Index 190-01004-03 Rev. B Garmin GTN 625/635/650 Pilot's Guide 15-27