HP Designjet 3D Service Manual page 140

N. "Can't Find Home - Check Modeling Base" displayed on LCD
1. Head stops over Z stage/
modeling base
2. Head moves to lower
modeling base sensor but
does NOT move over
modeling base
3. Head completes finding
modeling base routine then
displays error message.
4. Head stops moving while
attempting to lower Z detect
sensor plunger
1. No modeling base
2. Modeling base is used/defective - Replace
3. Verify substrate sensor is working properly,
verify at LED/test points on PDB.
4. Substrate sensor is loose or defective, tighten
or replace.
1. Modeling base sensor is NOT turning off
before performing touchdown (verify using
LED)
2. Y EOT sensor is not operating correctly. Verify
using LED/test points on PDB.
3. Debris on Z Stage casting prevents Z stage
from finding home
1. Modeling base is used/defective - Replace
2. Z offset value is incorrect (out of operating
range) Check/adjust value using HP
Designjet 3D Diagnostic
3. Flatness check may have failed. Use Tera Term
to read the touchdown values. Compare these
values to the "tolerance" value displayed. If
this value is over 1728 replace the modeling
base.
4. If failure reoccurs check XY table level using
the head bracket and dial indicator. Values
should be a band of 0.010 total for the four
points (0.003 total)
- If values are out of spec: Check for loose
tray mounting screws. If so level per
procedure.
- If screws are tight, level the XY table per
procedure.
5. If failure reoccurs the X rear guide rod may be
out of alignment. Replace XY table.
1. Using PDB LED's check to see that all sensors
are working correctly. If not check sensor
connections/wires or replace sensor
2. Z offset value is incorrect (out of operating
range) Check/adjust value using HP
Designjet 3D Diagnostic Software.
Software.
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