Modular highlight color and process color printing machine

Claim 1

An electrophotographic printing machine adapted to print process color or highlight color documents, including: a photoconductive member; means for recording a first latent image on said photoconductive member; first developer means for developing the first latent image recorded on said photoconductive member with toner of a first color; a first operator removable unit adapted to be positioned in an operative location associated with said photoconductive member or in a non-operative location remote from said photoconductive member, said recording means, responsive to said first operator removable unit being in the operative position, recording a second latent image on said photoconductive member, said first operator removable unit developing the second latent image with toner of a second color; a second operator removable unit, interchangeable with said first operator removable unit so as to position said second operator removable unit in the operative position and said first removable unit in the non-operative position with said second operator removable unit, in the operative position, recording a highlight color latent image on said photoconductive member; and second developer means responsive to said second operator removable unit being in the operative position, for developing the highlight color latent image with toner of a highlight color.