<Accessibility>
All the settings related to accessibility, such as inverting the screen colors and message display time, are listed with descriptions.
<Invert Screen Colors>
Select <On> to invert the display colors. Select <On> if the display is hard to view even after the brightness was adjusted in <Brightness>.
<Menu> 
<Preferences> <Accessibility> <Invert Screen Colors> Select <Off> or <On> 
<Preferences> <Accessibility> <Invert Screen Colors> Select <Off> or <On> <Brightness>
Adjust the brightness of the display to suit the installation location of the machine.
<Menu> <Preferences> <Accessibility> <Brightness> Adjust the brightness <Apply>
<Preferences> <Accessibility> <Brightness> Adjust the brightness <Apply> <Message Display Time>
Specify the interval in seconds at which two different messages are alternately displayed.
<Menu> <Preferences> <Accessibility> <Message Display Time> Enter a number for the interval <Apply>
<Preferences> <Accessibility> <Message Display Time> Enter a number for the interval <Apply>