HP Designjet 3D Service Manual page 127

2. Filament Present but Won't
Extrude
- Spin out
- Head Motor Doesn't turn
1. High pull force on the material spool.
a. Verify spool lid is inserted properly and
not rubbing on carrier.
b. Remove any debris from bottom of
carrier.
c. Filament is tangled on spool. Replace
spool.
2. High pull force in filament tubes.
a. Inspect filament tubes and Y block for
debris. Remove debris.
b. Inspect for kinked filament tubes.
Replace filament tubes.
c. Check for twisted feed tubes in energy
chain. If twisted, replace filament
tubes.
3. 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
4. Check for loose heater block clamp screws.
5. Plugged Liquefier - replace tips.
6. Check idler wheel gap.
7. Check liquefier alignment.
8. Head idler spring is deformed or installed
improperly. Replace head idler spring.
9. Possible head temperature issue
a. Replace head board and TC Amp
board.
b. Replace toggle head assembly.
10. Head motor power wires or encoder
failure - replace toggle head
1 1. In case of Z shift:
a. Realign Z guide rods. See
the Z stage" on page 327.
b. Replace Z motor and leadscrew.
c. Replace Z assembly.
"Installing
-111