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

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.
1. Make sure that paper is loaded in the printer.
2. Click Nozzle Check.
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, an
automatic head cleaning.
Printing with Mac OS 8.6 to 9.x
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