Xerox Nuvera 100, Service Manual

Page: 111 / 304

Troubleshooting 3-11
performance of the cap/wipe/purge assembly and vacuum
system. (Action Steps 4–8.)
If you see white “pinstripes” spaced 0.25 cm (0.1 inches)
apart across the page (but not present on the test page), the
problem is not with the cap/wipe/purge assembly or printhead.
Check for something binding the x-axis (e.g. a cable rubbing the
printhead). The x-axis shaft may need to be lubricated.
To lubricate, apply three dabs (1/10-in. diameter) of Nye
Rheolube 368F grease on the threads of the x-axis shaft.
4. Visually check the printhead’s faceplate. Through close
examination of the printhead’s faceplate, you can determine if
the wiper blade and gasket are damaged.
If you see any tiny wax droplets inside the ring where the
cap/wipe/purge gasket seals against the printhead faceplate
(Figure 3-2), the cap/wipe/purge gasket is leaking during purge.
This can be caused by a misaligned printhead or a defective
gasket. To verify printhead alignment, move the cap/wipe/purge
to the purge position and tilt the printhead forward until the
upper edge of the gasket touches the faceplate. If the left and
right sides touch the faceplate at the same time, the printhead
side-to-side alignment is OK and the problem is with the
gasket. If not, you’ll need to readjust the printhead gap.
If you see streaks or smudges of wax in the jet area of the
printhead’s faceplate after a clean cycle (Figure 3-3), the cap/
wipe/purge wiper blade is damaged and the cap/wipe/purge
assembly needs to be replaced.
5. Visually check the cap/wipe/purge wiper and gasket. Move the
printhead all the way back and raise the cap/wipe/purge
assembly. Inspect the rubber wiper (Figure 3-4), especially at
the ends, for signs of separation or damage to the blade. (See
figure 3-5 for damage to printhead.) Gently probe the cap/wipe/
purge gasket with fingers or blunt tool for signs of separation
from the cap assembly. Replace if defective.
6. Empty maintenance tray and check vacuum and decay time. To
check the cap/wipe/purge assembly purge performance, first
empty the waste tray. Attach the vacuum gauge (003-1377-00)
using a vacuum “T” (131-6819-00) at the metal pipe used to
connect to the cap/wipe/purge assembly. Perform the Clean Jets
cycle from the Troubleshooting menu on the front panel. Check
the Peak vacuum and Decay time to determine if there is a
problem with the vacuum system (pump, air valve or tubing) or
cap/wipe/purge gasket. The Peak vacuum should be greater
than 46 cm Hg (18 in. Hg, 9 psi). If the vacuum is less than 46
cm Hg, then the cap/wipe/purge gasket is leaking or the
vacuum pump is defective. To isolate the problem, go to Action
Step 8.