190-01004-02
GTN 625/635/650 TSO Installation Manual
Rev. F
Page 6-13
6.6.6
Lighting Configuration Page
Access the Lighting Configuration page, as shown
in Figure 6-9, by touching the ‘Lighting’ key on the
GTN Setup page. This page allows you to set
display parameters that affect the display backlight
and key lighting brightness.
SOURCE
Note that the display source can only be configured to track the photocell or lighting bus 1. If the aircraft
has a single lighting bus, display and key brightness can be set to track Lighting Bus 1.
MINIMUM LEVEL
This sets the minimum brightness of the keys or display, whichever is applicable. Touch the ‘Minimum
Level’ key corresponding to either the Keys or the Display to adjust the minimum brightness. The
minimum brightness level for the display can be adjusted in a range from 0.14% to 100.00%, with
100.00% being the highest brightness level. The minimum brightness level for the keys can be adjusted in
a range from 0.00% to 100.00%, with 100.00% being the highest brightness level. The display and key
brightness default level is set to 5.00% at the factory. Enter the desired minimum value on the keypad and
then touch the ‘Enter’ key to store the settings.
Selection
Description
Photocell
Backlight or key lighting level is determined by the ambient light level as
measured by the photocell on the GTN.
Lighting Bus 1
Backlight or key levels track the Lighting Bus 1 levels.
Lighting Bus 2
Key lighting levels track the Lighting Bus 2 levels.
Figure 6-9. Lighting Configuration Page
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