· Explain in detail the operation of printing (monochrome)

O The page description language describes how the page should be printed (as lines, arcs and polygons) o This is translated to a bit map image by the processor and saved in raster memory o A negative charge is applied to the photosensitive drum o Laser beams are directed onto the rotating drums surface o The lasers are then turned on or off by positrons determined by the saved bitmap image o This results in the negatively charged drum being positively charged in these sections hit by the lasers- this corresponds to the black parts of the printing o The charged surface of the drum is then exposed to a toner o * Darker areas are achieved by applying more layers of toner * o * A higher voltage difference between the toner and the drum achieves more toner being deposited into the drum quicker * o The drum is then rolled and pressed onto a sheet of paper which transfers the contents of the projected image onto the page * not needed *