Oki MC860n MFP manual Feature, Option, Description, this is done on power on and when

FEATURE	OPTION			DESCRIPTION
Print Setup	Color Menu	Cyan	-3, -2, -1, 0, +1, +2,	Adjusts image density for each
(cont.)	(cont.)	HIGHLIGHT	+3	color component (cyan, magenta,
				yellow and black). Normal setting
		Cyan MID-TONE	-3, -2, -1, 0, +1, +2,
				is 0.
			+3
		Cyan DARK	-3, -2, -1, 0, +1, +2,
			+3
		Magenta	-3, -2, -1, 0, +1, +2,
		HIGHLIGHT	+3
		Magenta MID-	-3, -2, -1, 0, +1, +2,
		TONE	+3
		Magenta DARK	-3, -2, -1, 0, +1, +2,
			+3
		Yellow	-3, -2, -1, 0, +1, +2,
		HIGHLIGHT	+3
		Yellow MID-	-3, -2, -1, 0, +1, +2,
		TONE	+3
		Yellow DARK	-3, -2, -1, 0, +1, +2,
			+3
		Black	-3, -2, -1, 0, +1, +2,
		HIGHLIGHT	+3
		Black MID-TONE	-3, -2, -1, 0, +1, +2,
			+3
		Black DARK	-3, -2, -1, 0, +1, +2,
			+3
		Cyan Darkness	-3, -2, -1, 0, +1, +2,	Adjusts darkness of each color
			+3	(cyan, magenta, yellow and
				black). Normal setting is 0.
		Magenta	-3, -2, -1, 0, +1, +2,
		Darkness	+3
		Yellow Darkness	-3, -2, -1, 0, +1, +2,
			+3
		Black Darkness	-3, -2, -1, 0, +1, +2,
			+3
		Adjust	Execute	Press Yes to execute or No to
		Registration		cancel.
				Performs automatic color
				registration adjustment. Normally
				this is done on power on and when
				the top cover is opened and then
				closed. This process accurately
				aligns the cyan, magenta and
				yellow images to the black image.
		CYAN Reg Fine	-3, -2, -1, 0, +1, +2,	Performs fine adjustment of image
		Adj	+3	timing in relation to the black
				image component.
		MAGENTA Reg	-3, -2, -1, 0, +1, +2,
		Fine Adj	+3
		YELLOW Reg	-3, -2, -1, 0, +1, +2,
		Fine Adj	+3
		Ink Simulation	OFF, SWOP,	Selects from a range of industry
			EUROSCALE, JAPAN	standard color swatches.

Configuring Your Machine > 48