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2-18 Phaser 8400/8500/8550/8560 Color Printer Service Manual
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