Omron NT631 Operation Manuals page 233

System Maintenance
Checking the Backlight (for NT631C only)
S The check screen displays all the dots on the screen: either press anywhere on
the touch panel or wait for three seconds and all the dots will be cleared.
With the NT631C, the display and clearance of all the dots on the screen is re-
peated for each color in turn (red → green → blue → magenta → cyan → yellow
→ white → black).
On completion of the display and clearance of all dots, the NT631/NT631C re-
turns to the "DEVICE CHECK MENU" screen.
S To abort the LCD check, press the top right corner of the touch panel. The
NT631/NT631C will return to the "DEVICE CHECK MENU" screen.
Check if the backlight functions normally with the NT631C by following the menu
operation from the System Menu shown below. This function is not available with
the NT631.
Select "Device Check".
Select "LCD Check".
Select "Maintenance Mode".
Section 6-11
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