Xerox Nuvera 100, Service Manual

Page: 57 / 304

General Information 1-57
The cap/wipe/purge assembly is attached to a pair of parallel belts on
a rotating shaft. To perform a printhead maintenance cycle, the
printhead is first tilted away from the drum. Then the cap/wipe/purge
assembly motor drives the cap/wipe/purge assembly belts, which pull
the attached cap/wipe/ purge assembly up to the faceplate of the
printhead. The printhead is then tilted forward to seal against the
cap/wipe/purge assembly.
When the cap/wipe/purge assembly is in its lowered home position, it
unlocks the maintenance drawer so it can be removed. If the cap/
wipe/purge assembly is away from its home position the drum
maintenance drawer is locked in place.
WARNING
When servicing the printer be careful of the cap/wipe/purge
assembly as it passes the printhead. If a damaged wiper blade of
the cap/wipe/purge assembly catches on the printhead it could
propel hot liquid ink upward into your face.
Vacuum for the purge cycle is obtained from the vacuum/pump
module which contains a vacuum pump and an air valve solenoid
(Figure 1-25). The body of the vacuum/pump module forms a vacuum
accumulator. A small vacuum pump, running for 75 to 90 seconds,
creates a strong vacuum in the vacuum accumulator. Then an air
valve is energized for a fraction of a second, exposing the printhead
faceplate to the strong, accumulated vacuum to suck debris and
bubbles out of the printhead nozzles. With the air valve once again de-
energized, air is metered through the 7-mil orifice to gradually
release the vacuum at the faceplate.