HP Designjet 3D Service Manual page 128

3. Intermittent LOE
- Head Motor
- Intermittent tip plug
4. Part Geometry Failure
- Model or support features fell
over
1. Check for loose heater block clamp screws.
2. Make sure the head connectors are seated
properly.
3. Check air plenum for: proper hose
connection; properly seating; cracks or
damage.
4. Check to make sure head blower fan hose
is connected to blower.
5. If extrusion fails on first layer
a. If using a used modeling base, retry
with a new one
b. Rerun Z calibration
6. Plugged Liquefier - replace tips.
7. Inspect model for excessive overfill.
a. Toolpaths should not overlap by more
than 50%. If so, reorient and
reprocess STL.
b. If model curl has caused the part to
contact the tip, reprocess part with less
dense fill. Re-run tip Z cal if part is
separating from supports
8. Check idler wheel gap.
9. Check liquefier alignment.
10. Head idler spring is deformed or installed
improperly. Replace head idler spring.
1 1. Possible head temperature issue
a. Replace head board and TC Amp
board.
b. Replace toggle head assembly.
12. Head motor power wires or encoder
failure - replace toggle head
13. Blower fan not supplying enough air flow -
weak or stalling. Replace fan.
14. Replace umbilical cable
15. Replace controller board
16. In case of Z shift:
a. Realign Z guide rods.
b. Replace Z motor and leadscrew.
c. Replace Z assembly.
1. Reorient, reprocess and resubmit the part
2. Run Z calibration
3. Replace tip shields and tip wipe assembly
4. If part has shifted in X or Y, refer to part
quality section, part shift subsection.
5. In case of Z shift:
a. Realign Z guide rods.
b. Replace Z motor and leadscrew.
c. Replace Z assembly.
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