Xerox ColorQube 9303 Series Service Manual page 1722

Figure 5 Umbilical components
The CVU contains valves which will allow ink to flow toward the printhead but not back toward
the reservoir. This valve is primarily used by the system during an air purge of the printheads
without a CVU, ink would be forced back into the air router and replacement of the reservoir
and umbilical assembly would be necessary.
NOTE: For the CVU to work properly it must be 'primed' with ink prior to a purge. Failure to
'prime' the CVU will likely lead to a replacement of the ink reservoir when ink and air are forced
back into the reservoir and air router during a purge routine.
Printhead Alignment
The Ink On Drum (IOD) detection system collects data used for printhead interlacing align-
ment, missing jet detection, jet substitution and to check for the presence of stray pixels left
behind on the drum after transfix. The latter is required to ensure good image quality and also
to prevent the build up of residual ink on the drum, which could eventually damage the print-
heads.
Principles of Operation
Printheads
The printheads apply the image to the drum,
Stitch Motion
Figure 7
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Figure 6.
Figure 6 Printhead components
Figure 7 Stitch motor motion
ColorQube® 9303 Family