Xerox 8500DN Service Manual - Page 50

Theory of Operation Transfix System The Transfix Roller applies pressure to the back side of the media as it moves between the Transfix Roller and Drum. This pressure transfers the image from the drum to the paper. A set of springs in the Transfix Load Module determines how much pressure the Transfix Roller applies to the Drum. The pressure is uniform across the length of the Transfix Roller to avoid wrinkles and light spots on the prints. After the Transfix Roller engages, the Drum rotates to advance the media through the transfix process. The Drum continues to advance the media until the Transfix Roller disengages. The action of the Process Drive lifts and lowers the Transfix Roller. The upper gears of the Process Drive move to rotate the Transfix Camshaft to bring the Transfix Roller into contact with the Drum. The gears reverse to rotate the Transfix Roller back to its original position, except when printing from Tray 1 or on envelopes. The transfix load springs and double lever arms increase the force when the Transfix Camshaft engages. Caution Never attempt to adjust or increase the transfix pressure on the springs. s8500-021 2-18 Phaser 8400/8500/8550/8560 Color Printer Service Manual