Omron Programmable Terminals NT631 Setup Manual page 207

System Maintenance
190
Adjust the backlight brightness by following the menu operation from the Sys-
tem Menu shown below.
Ver 4.12
Select Maintenance Mode.
Select I/O Settings.
Select Brightness Adjust.
Adjust the contrast with the High, Middle, and
Low touch switches in the left half of the
screen.
Press Quit.
The contrast is set and the NT631/NT631C
returns to the I/O SETTINGS MENU screen.
Section 6-11