Figure 6-13. Enhanced Lighting Configuration - Source Settings Page - Garmin GTN 625 Installation Manual

6.6.7.1 Source Settings Page
Access the Source Settings page, shown in Figure 6-13, by touching the 'Source Settings' key on the
Enhanced Lighting Configuration page. The Source Settings page allows configuration of the lighting bus
and photocell parameters listed below.

Figure 6-13. Enhanced Lighting Configuration - Source Settings Page

DISPLAY SOURCE
Sets the source input for the display backlight. This may be set to Photocell or Lighting Bus 1. If
configured for Photocell, the photocell sensor will be used to provide the lighting input level for day and
night curves. The display source may alternatively be configured for a dimmer lighting bus.
KEYS SOURCE
Sets the source input for the keys backlight. This may be set to Photocell, Lighting Bus 1, or 
Lighting Bus 2 (if display source is configured for Lighting Bus 1). If configured for Photocell, the
photocell sensor will be used to provide the lighting input level for day and night curves. The keys source
may alternatively be configured for a dimmer lighting bus.
RESPONSE TIME
Sets the speed with which the key or display brightness responds to the input level (bus voltage or ambient
light) changes. The higher the number the slower the display responds. This field has a range of two to
seven seconds, and is set to two seconds as a default value.
LIGHTING BUS 1/2
These fields are configurable when either the display or the keys source is set to lighting bus 1 or 2. This
field sets the input type for each lighting bus source (5VDC, 5VAC, 14VDC, or 28VDC).
GTN 625/635/650 TSO Installation Manual 190-01004-02
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