5 composed of a plurality of programmable components and sub systems which cooperate to carry out the copying or printing job machine 5 employs a photoconductive belt 10 belt 10 is entrained about stripping roller 14 tensioning roller 16 idler rollers 18 and drive roller 20 drive roller 20 is rotated by a motor coupled thereto by suitable means such as a belt drive as roller 20 rotates it advances belt 10 in the direction of arrow 12 through the various processing stations disposed about the path of movement thereof initially the photoconductive surface of belt 10 passes through charging station a where two corona generating devices indicated generally by the reference numerals 22 and 24 charge photoconductive belt 10 to a relatively high substantially uniform potential next the charged photoconductive belt is advanced through imaging station b at imaging station b a document handling unit 26 sequentially feeds documents from a stack of documents in a document stacking and holding tray into registered position on platen 28 a pair of xenon flash lamps 30 mounted in the optics cavity illuminate the document on platen 28 the light rays reflected from the document being focused by lens 32 onto belt 10 to expose and record an electrostatic latent image on photoconductive belt 10 which corresponds to the informational areas contained within the document currently on platen 28 after imaging the document is returned to the document tray via a simplex path when either a simplex copy or the first pass of a duplex copy is being made or via a duplex path when a duplex copy is being made the electrostatic latent image recorded on photoconductive belt 10 is developed at development station c by a magnetic brush developer unit 34 having three developer rolls.