Xerox ii LINXSolid Inkjet 100 Service Manual page 73

Preparation. Following printer power-up from a cold start or in
response to a front panel menu selection, the print engine begins a
printhead long cleaning cycle. The first step is to stop any ink melting
operation. The printhead is tilted into the standby position. In this
case, the cam follower follows the rotating cam gear, tilting the
printhead backward. Following the head tilt, the cap/pipe/purge
clutch energizes to engage the cap/wipe/purge timing belts to the
paper path drive system. Then the paper path motor rotates
counterclockwise to pull the cap/wipe/purge assembly into its cleaning
position. Next, the printhead is tilted forward slightly to seal against
the cap/wipe/purge assembly.The vacuum pump turns on for .5
seconds, just before sealing to build a slight vacuum in the
accumulator. The solenoid valve opens as the cap seals on the
printhead to prevent air from being pushed into the printhead. The
cap then moves down a little bit to improve the seal. Then the main
board starts the vacuum pump, which begins to create a vacuum in
the vacuum accumulator. The pressure in the accumulator is lowered
to about 10 psi. It takes the vacuum pump about 75 to 90 seconds to
achieve this vacuum and then the pump is shut off.
Purge. Actual cleaning begins with the air valve solenoid energizing
for 0.300 seconds; this momentarily routes the vacuum accumulator
to the cap/wipe/purge assembly and exposes the printhead faceplate
to the vacuum. The vacuum bleeds off after about 6 seconds through
the 7 mil orifice. This is repeated 3 to 4 times, depending on the purge
type, with 15 seconds between events. Then the printhead is tilted
backward to break the seal and the printer waits 10 seconds for the
waste ink to drain from the cap/wipe/purge assembly into the waste
tray.
Long wipe. The paper path motor slowly rotates clockwise to pull the
cap/wipe/purge assembly's wiper blade down the face of the
printhead, wiping away ink and debris.
Long flush. The printhead is tilted back slightly and the cap/wipe/
purge assembly is raised to bring the wiper blade even with the jet
nozzles. All jets are fired for 6 seconds to flush mixed ink and foreign
matter out of the jets. The waste ink drips into the waste tray of the
drum maintenance drawer.
Dab. The cap/wipe/purge assembly is lowered slightly and the
printhead is tilted forward to dab the wiper blade against the lower
faceplate, to clean ink off the wiper. The dab is actually a short wipe
and it is done on the part of the faceplate below the nozzles
Short wipe. Following the dab, the cap/wipe/purge assembly is
raised and the printhead is tilted forward against the wiper blade.
The cap/wipe/purge assembly is slowly lowered again to clean the
faceplate but stops sooner, before it can run into the debris from the
first wipe.
Short flush. The printhead is tilted back slightly and the cap/wipe/
purge assembly is raised to bring the wiper blade even with the jet
nozzles. All jets are fired again for 0.6 seconds.
General Information 1-73