Garmin GNX 375, Pilot'S Manual

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2-32 GPS 175/GNX 375 Pilot’s Guide 190-02207-02 Rev. B
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2.22 Display Brightness Control
2.22.1 Automatic Brightness Control
Dimming is limited to prevent on screen indications from becoming unreadable. The
built in photocell automatically controls display brightness based on ambient light
levels.
2.22.2 Manual Brightness Control
Optionally, the unit is configurable to use an aircraft dimming bus for display
brightness control. Upon reaching minimum input level, display brightness reverts to
the photocell. This prevents the display from going black in the event of a dimmer
input failure.
Installer configured curves determine the amount of change in brightness that
occurs in response to a control adjustment.
If brightness control is not satisfactory, contact a Garmin dealer to adjust the
lighting curves.
Depending on configuration, display brightness is controlled using
inputs from the built in photocell, aircraft dimmer bus, or both.
During automatic control, the pilot
may still adjust brightness using
the manual offset controls in the
Backlight page.
The unit retains manual offset
settings over power cycles.
Decrease
Backlight
Increase
Backlight
Backlight
Intensity Level
Manual Offset
Indicator