October 2012
8-24
ColorQube 8570/8870 Service Manual
Print Process
Revised, 3rd Revision - Xerox Internal Use Only
Theory of Operation
X-Axis or lateral movement of the Printhead is accomplished by means of a stepper motor driv-
ing a fine-thread screw and conical nut. The Printhead is supported by two short X-Axis Shafts
and correct spacing to the Drum is maintained by sliding contact with two plastic buttons on
either end of the Drum Assembly. A tension spring linked to the Printhead’s left shaft provides
a preloaded force so the Printhead’s right shaft is held against the cone-nut eliminating all play
in the system.
The X-Axis system has no encoder to provide position feedback. To find the Printhead Home
position, the X-Axis system drives the Printhead against the left frame, stalls, then reverses
and moves a set distance.
Figure 7 Printhead X-Axis Drive
Printhead Tilt
The Printhead is able to rotate into four basic positions.
• Print/ Ready Position (0 degree)
• Park/ Sleep Position (22.3 degrees)
• Wipe Position (12 degrees)
• Wiper Bypass Position (19 degrees)
1. Print/ Ready Position (0 degree): The Printhead is forward and resting against the right
and left head-to-drum buttons. The head-to-drum buttons define the space between the
Jet Stack and the Drum.
Figure 8 Print/ Ready Position
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