Epson Stylus Pro 4400 Reference Manual page 216

❏ Do not use the Nozzle Check, Head Cleaning, or Print Head
Alignment utilities while printing is in progress; otherwise, your
printout may be marred.
EPSON StatusMonitor
This utility provides you with printer status information, such as
the amount of remaining ink.
Nozzle Check
This utility checks the print head nozzles for clogging. Check the
nozzles when you notice the 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 217.
If you click Auto in the Nozzle Check dialog, or turn on AUTO
CLEANING from the control panel on the printer, this utility not
only checks 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 the print quality has declined. Use this utility
to perform head cleaning. See "Cleaning the print head" on page
219.
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 appear out of alignment or if white or
black banding noise appear in your printed data. Use this utility
to realign the print head. See "Aligning the print head" on page
220.
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Printing with Mac OS X