HP DESIGNJET 3D, Service Manual

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Figure 60: Toggle bar in neutral position
4. Remove any excess material found around the head area.
A. Clean out as much of the material as possible using needle
nose pliers, a probe, or equivalent tool.
B. For easier access to areas that may need to be cleaned,
move the material idler wheels out of the way (there is one
idler wheel for support material and one for model
material , see Figure 59.
i. Place a 7/64 T-Handle Allen wrench between the
toggle spring post and the idler wheel post as illustrated in
Figure 61. (model side shown).
NOTE: Material fed to the tip can sometimes jam causing a build-
up of material under the head cover.
CAUTION: The end of the tip where the material enters is called
the extrusion tube. Extrusion tubes are fragile. Use care when
working in this area so as to avoid damage to the tubes.
NOTE: Move only one idler wheel assembly at a time. Finish
cleaning around the moved wheel and restore it to its normal
position before moving the other idler wheel. Having both wheels
out of position simultaneously could stretch the spring.