Epson STYLUS COLOR 580 Setup Manual page 12

Here are sample printouts.
Good sample Print head needs to be cleaned
Segments are missing
Print head alignment check
The printer prints test patterns, allowing you to check if the print head is
aligned.
Here are sample printouts.
From each pattern on the printed test sheet, choose the vertical line that is
aligned best. For each pattern, select the corresponding line number from
the appropriate drop-down list box in the Print Head Alignment dialog box,
then click Finish to put the new settings into effect.