VERIFIED SOLUTION i

How to adjust the contrast on the DM300C, DM400C and more

Products affected: DM300C™, DM400C™, DM450C™, and DM475™
Follow these steps to lighten or darken the screen:
  1. Press Menu
  2. Select Setup
  3. Select Display Contrast
  4. Select Increase Contrast or Decrease Contrast to change the contrast level
Note: The default is six lines.
  1. Select Accept
  2. Press Home
UPDATED:  April 19, 2016