TA Triumph-Adler P-4030 MFP - Manual (Page 268)

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Setup and Registration (System Menu) > System Menu
Display Bright. (Display Brightness)
Common Settings Display Bright.
Item Description
Display Bright. Set the brightness of the message display.
Value : Darker -3, Darker -2, Darker -1, Normal 0, Lighter +1, Lighter +2, Lighter +3