Stylus Pro 4000 Field Repair Guide 4/28/05
Print Head Slant Adjustment (CR) Printer Component, Software Item, LCD Display, Printer Button Page 171.
6. Using a lens, inspect the printed pattern.
7. Adjust, and reprint, until the alignment pattern is correct.
8. Tighten the 4 Screws, and reprint the pattern to verify that the pattern is still correct.
9. Re-install the Carriage Cover.
The pattern should look like this
Move this lever down to rotate the Print Head clockwise.