Replacing Print Heads - Stratasys J850 User Manual

Stratasys J850/J835 User Guide
If you are replacing print heads now, the wizard guides you through the
procedure when you click Next. Continue with "Replacing Print Heads" below.

Replacing Print Heads

The condition of the print heads directly affects the quality of 3D prints. 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 4-64.)
• There are noticeable grooves in the surface of 3D prints.
• Visual inspection of the head reveals that its surface is damaged—peeling
• The printer interface displays a warning or malfunction message relating to
Replace print heads only after consulting with an authorized Stratasys
service provider.
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.
DOC-18001 Rev. H
To replace print heads, you need these tools and materials:
❒ replacement print head(s)
❒ 90% isopropanol (IPA—isopropyl alcohol) or ethanol (ethyl alcohol)
❒ disposable cleaning gloves (supplied with the print head; or use any
clean, powder-free protective gloves)
❒ a supplied cleaning cloth or equivalent
❒ a mirror
❒ a 4-mm hex (Allen) key
❒ a small Phillips screwdriver
❒ the Missing Nozzles ruler
❒ the scale supplied for use in the Head Optimization wizard (Weight
Test)
Important: Before beginning this procedure, ensure that the scale is
calibrated and at least partially charged.
or bubbles in the nozzle area.
a print head—
❒ Head Heater temperature timeout
❒ Head Heater thermistor open
❒ Head Heater thermistor short
4 Operating and Maintaining the Printer
4-72