Raytheon RayChart 620, Operation Manual, Page: 24 / 121

Chapter 2: Getting Started 11
Other Soft Key Functions
In addition, the soft keys provide access to different functions that you
will probably use less often. If you press the MENU, EVENT, MARK,
DISPLAY or POWER dedicated keys, the labels on the soft keys
change to allow you to use these other functions, as shown in the
illustration on page 9. Press CLEAR to return to the default display.
2.5 Adjusting the Lighting and Contrast
You can change level of lighting and contrast for the screen. There are
six brightness levels, and 40 contrast levels.
➤
To change the backlighting and contrast:
1. Press the POWER key. (Do not press and hold the key, or the
power-off message will be displayed.)
Two sliders appear on the screen, showing the current settings for
brightness and contrast, and the soft key labels are updated to
provide control of the sliders.
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2. Press the appropriate soft key, to adjust the backlighting brightness
or the contrast to the required level. The brightness and contrast
change as you adjust the sliders.
3. Press ENTER to store the new settings and clear the soft keys and
graphical display.
Alternatively, you can press CLEAR to exit without making the
changes.
The screen returns to the standard display.
The new lighting and contrast levels are retained until you reset them or
turn off the RayChart. At power-on, the screen lighting is always off, but
the last-used contrast setting is retained.
The key lighting is bright when the screen backlighting is on. Even when
the screen lighting is off, the keys are lit at a low level (which is not
visible in daylight), so that you will always to able to find the keys.