Xerox C2424 Service Manual - Page 70
Drum Preparation, Printing
UPC - 095205676532
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Drum Preparation To prepare the drum, a thin coating of silicone oil is applied to the surface of the drum. First the drum is rotated. Next, the oil roller and blade of the drum maintenance system are raised into contact with the drum. To accomplish this, the process drive rotates the drum maintenance camshaft lifting the oil and wiper blade to the drum. The cams on the ends of the camshaft push against followers on each side of the drum maintenance system, forcing the oil roller and blade against the drum. The drum is rotated against the oil saturated roller. Drum Oil On Drum Blade Drum Maintenance Maintenance Roller Camshaft Drum Maintenance Pivot Plate s2424-040 Printing To print, the drum starts rotating at a speed dependent upon print resolution. As the drum reaches the correct speed, the jets begin to fire to deposit the image on the oiled portion of the drum. As the jets fire, the printhead moves from right to left to complete the image on the drum. When printing, the printer performs a "six-jet interlace," in which each jet lays down a particular number of pixel columns, depending on the print resolution. Each jet lays down one pixel column for each drum rotation, which varies from eight to 16 rotations, depending on the print resolution. Interlacing "averages out" the variability between jets by interlacing each jet with other jets. In some test prints, the printhead moves to the right and lays down 309 parallel bands of ink. Each band is composed of 15 pixel columns of dots from an individual jet. 2-26 WorkCentre C2424 Service Manual