Epson Stylus Photo 750 - Examining the Nozzle Check Pattern

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Examine the nozzle check pattern you print. It should look something like
this:
Each staggered horizontal and straight vertical line should be complete,
with no gaps in the dot pattern. If your printout looks okay, you’re done. If
any dots are missing, as shown below, clean the print head again; see
Cleaning the Print Head for instructions.
missing dots