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Phaser 8400/8500/8550/8560 Color Printer Service Manual 2-23
Theory of Operation
Print Process
Once the printer processes an image and creates a printing bitmap, the print
cycle begins. Sensors maintain correct operating temperatures for the
Printhead and Drum. Sensors also monitor ink levels in the reservoirs. If
necessary, the ink loader adds ink.
At the ready state, the print process consists of the following steps:
■ Drum Preparation
■ Printing
■ Paper Pick
■ Transfixing and Exiting
W
arn
i
ng
Keep your fingers away from the Y-Axis Motor while the motor is in
operation. The motor’s closed-loop servo system is inherently dangerous.
Drum Preparation
To prepare the Drum, the drum maintenance system applies a thin coating of
silicone oil to the surface of the Drum. The Process Drive first rotates the
Drum Maintenance Camshaft. As the drum rotates, 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 saturated roller
evenly distributes oil on the Drum as it rotates.
s8500-016
Drum
Maintenance Roller
Drum Maintenance Pivot Plate
Drum Maintenance
Camshaft
Blade
Oil on Drum