Epson Stylus Pro 4000 Field Repair Manual page 173

Stylus Pro 4000 Field Repair Guide
3. Loosen the 5 indicated Screws 1/4 turn.
Loosen 1 Screw that fastens
the Adjustment Lever
4. Move the Carriage back to the capped position.
5. Click on the Print
Print Head Slant Adjustment (PF)
Button, the alignment pattern will be printed
Printer Component,
Loosen 4 Screws that fasten the
Print Head
Software Item, LCD Display, Printer Button
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Page 173.