Xerox 8500DN Service Manual - Page 62

Theory of Operation Duplex Printing When duplex printing, the Exit Rollers pull the media to a predetermined location, such that the trailing edge is adjacent to the Exit Rollers. Then, the Exit Rollers pull the media back into the duplex path. The media deskews against a non-rotating deskew nip. From this point on, the print is processed through the Preheater and transfix system to the Output Tray in the same manner as a single-sided print. Phaser 8500/8550/8560 models include a Preheater Lift Solenoid, mounted to the Transfix Load Module, that increases the physical spacing between the Preheater plates when printing the second side of duplex prints. The increased spacing prevents the paper from rubbing as hard against the plates, which can cause smearing to occur. Since the 8400 models operate at a lower temperature, the solenoid is not needed. Exit Sensor Strip Sensor Preheat Sensor Duplex Roller Deskew Sensor Exit Roller Preheater Lift Solenoid Duplex Roller s8500-028 2-30 Phaser 8400/8500/8550/8560 Color Printer Service Manual