Stratasys J750 User Guide
Replacing
The condition of the print heads directly affects the quality of printed models.
Print Heads
You may need to replace a print head if one or more of the following
symptoms occurs:
• The Head Optimization wizard determines that a print head is defective.
(See "Optimizing (Calibrating) Print Heads" on page 4-47.)
• There are noticeable grooves in the surface of printed models.
• Visual inspection of the head reveals that its surface is damaged—peeling
• The printer interface displays a warning or malfunction message relating
Replace print heads only after consulting with a Stratasys-authorized
customer-support engineer.
The Head Optimization wizard guides you through the procedure of replacing
a print head, and configures printer components to enable you to perform it.
Only replace a print head with the aid of the wizard.
The entire print-head replacement procedure takes about 45 minutes, and
consists of the following phases:
A. Identifying the head(s) needing replacement.
B. Preparing the print block for head replacement.
C. Removing the defective print head.
D. Installing a new print head.
E. Optimizing the print heads (done automatically by the wizard).
F. Performing head alignment.
DOC-08040 Rev. E
or bubbles in the nozzle area.
to a print head—
❒ Head Heater temperature timeout
❒ Head Heater thermistor open
❒ Head Heater thermistor short
This is normally done by the Head Optimization wizard. Otherwise,
evidence of physical damage to the head surface or a malfunction message
indicates which head needs replacing.
This is done automatically when you run the wizard.
4 Operating and Maintaining the Stratasys J750 3D Printer
4-54