Epson 740 Series - Manual (Page 131)

Maintenance and Transportation Page 131
Examining the Nozzle Check Pattern
Examine the nozzle check pattern you print. It should look
something like this, with the lower pattern colored magenta, cyan,
and yellow:
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