Objet Objet30 User Manual - page 115
DOC-24000 Rev. C
7–35
Objet30 User Guide
Replacing
Print Heads
The condition of the print heads directly affects the quality of printed
models. You need to replace a print head if one or more of the following
symptoms occurs:
•
There are noticeable grooves in the surface of printed models.
•
The pattern test reveals that more than four consecutive nozzles—or a
total of more than 12 nozzles—are not functioning.
•
Visual inspection of the head reveals that its surface is damaged—
peeling or bubbles in the nozzle area.
•
The Objet30 interface displays a warning or malfunction message
relating to a print head—
Head Heater temperature timeout
Head Heater thermistor open
Head Heater thermistor short
•
Tests reveal that the material printed by a print head is underweight
(that is, not enough material is being outputted).
Note: Weight tests are performed only by an authorized service engineer.
A wizard guides you through the procedure of replacing a print head, and
adjusts components of the Objet30 printer to enable you to perform it. Only
replace a print head with the aid of the wizard. The procedure takes about
75 minutes, and consists of the following phases:
A. Identifying the head(s) needing replacement.
This is usually done by examining the results of the pattern test, after
attempting all other means for improving print quality (see
“Improving Print Quality” on page 7‐25). Otherwise, evidence of
physical damage to the head surface or a malfunction message
indicates which head needs replacing.
B. Preparing the print block for head replacement.
This is done automatically when you run the Head Replacement
wizard.
C. Removing the defective print head.
D. Installing a new print head.
E. Performing weight calibration.
The wizard prints a sample. After weighing it on a scale, you enter the
weight in the wizard dialog box.
Replacing print heads is expensive. Replace them only after attempting all
other means for improving print quality (see “Improving Print Quality” on
page 7-25) and after consulting with an Objet-authorized customer-support
engineer.