Checking The Print Head Nozzles - Epson Stylus Pro 4000 Reference Manual

Nozzle Check
This utility checks the print head nozzles for clogging. Check the
nozzles when you notice print quality has declined and after
cleaning to confirm that the print head nozzles have been cleared.
See "Checking the print head nozzles" on page 230.
If you click Auto in the Nozzle Check dialog box, or turn on AUTO
CLEANING from the control panel on the printer, this utility does
not only check the clogging nozzles, but also performs head
cleaning automatically.
Head Cleaning
This utility cleans the print head. You may need to clean the print
head if you notice print quality has declined. Use this utility to
perform the head clean. See "Cleaning the print head" on page
232.
Print Head Alignment
This utility can be used to improve the print quality of your
printed data. The alignment of the print head may need to be
adjusted if vertical lines should appear out of alignment or if
white or black banding noise should appear in your printed data.
Use this utility to realign the print head. See "Aligning the print
head" on page 233.

Checking the print head nozzles

If you find that the printed data is unexpectedly faint or dots in
the printed data are missing, you may be able to identify the
problem by checking the print head nozzles by using the Nozzle
Check utility.
To use the Nozzle Check utility, follow these steps.
Note:
Do not start Nozzle Check utility while printing is in progress;
otherwise, your printout may be marred.
230
Printing with Mac OS X