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One of the advances made in printing using toner was to use LEDs to draw the image on a photo-drum instead of a laser. Getting the toner to remain attached to the paper after being tranfered from the photo-drum takes a finely tuned electro-static charge between the electrical potential of the toner and the paper and then disipating that charge without disturbing the image before passing through the fuzer unit. Using tubular heat lamps inside a teflon coated roller is HPs method of fuzing the image to the page and is used in most other types of Ep type process printers. Collecting excess toner from the photo-drum and erasing the previous image and preparing it for the next image is also a very critical part of making a repeatable process viable. HP enclosed the toner and photo-drum in a single package where others seperate the elements into individual components but make for messy toner handling neccesary outcomes.