40 DSM300 Operation with PLUS Series Displays2. Press the LIGHT soft key if it is not already highlighted.3. The LIGHT soft key toggles lighting ON/OFF.4. Use the trackpad (up or down) to increase or decrease the setting. You canpress and hold the trackpad to change the setting more rapidly. The lightinglevel is adjusted as you change the setting.5. Press the CONTRAST soft key. Adjust the setting in the same way as for thelighting. There are 64 different contrast levels.6. Press ENTER to return to the default screen, with the new lighting and con-trast levels retained, or press CLEAR to discard the changes and return to thedefault screen.If lights are left ON when you switch off the display, the next time the display isswitched on, the lights will be ON, but at the default setting of 42%. The newcontrast level is retained until you reset it, unless you set the control very low orvery high; in this case, the contrast will be restored as follows:Contrast set > 30% restored to 30%Contrast set > 70% restored to 70%Brightness and Color Settings (Color Displays)The MULTI key on a color LCD unit provides controls to set up the display colorsand brightness. You can choose the background color and the color threshold;color threshold lets you determine which echoes are displayed, by selecting theminimum color strength the sounder uses.You can also select the color set, for a bold or soft color palette. The brightness ofthe screen can be adjusted over a wide range, suitable for viewing in daylight(high brightness level) or at night (low brightness level).The key lighting is automatically adjusted as you alter the screen lighting, so thatyou can always find the keys. If you set the backlight to a high level, the keylighting is dimmed; if you set the backlight to a low level, the key lighting level isincreased.37%70%LIGHT CONTRASTWHT LINEOFF OND4895-2POWERAUTO LO HICONTRAST50%