Epson STYLUS PRO 4400 Reference Manual page 75

3. Click Print if you want to visually check 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.
Note:
If you turn on AUTO CLEANING from the control panel on the printer
even though Print has been selected, the Nozzle Check utility not
only checks for the clogged 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.
If you find missing dots, clean the print head nozzle. See
"Cleaning the print head" on page 76.
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