Stratasys J750 User Manual page 131

Stratasys J750 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
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 6-45.)
• 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.
DOC-08010 Rev. E
To replace print heads, you need these tools and materials:
❒ replacement print head(s)
❒ 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 3 mm hex (Allen) key (depending on the type of print block)
❒ the scale supplied for use in the Head Optimization wizard (Weight
Test)
❒ the Missing Nozzles ruler
or bubbles in the nozzle area.
to a print head—
❒ Head Heater temperature timeout
❒ Head Heater thermistor open
❒ Head Heater thermistor short
6 Operating and Maintaining the J750 3D Printer
6-52