Epson Stylus Pro 4000 Reference Manual page 231

1. Make sure that paper is loaded in the printer.
2. Click Nozzle Check.
3. Click Print if you want to visually check to see if any print head
nozzles are clogged, if you are using non-Epson special media, or
if the width of paper you are using is less than 210 mm. Click Auto
if you want to perform an automatic nozzle check and, if the
nozzle check indicates it is necessary, an automatic head cleaning.
Note:
If you turn on AUTO CLEANING from the control panel on the printer
even though Print has been selected, the Nozzle Check utility does
not only check the clogging nozzles, but also performs head cleaning
automatically. If you are using non-Epson special media, or if the
width of paper you are using is less than 210 mm, turn off AUTO
CLEANING from the control panel on the printer.
4. Follow the on-screen instructions to print a nozzle check pattern.
5. If you find missing dots, clean the print head nozzles,
referring "Cleaning the print head" on page 232.
Printing with Mac OS X
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