Epson Stylus COLOR 660 Daily Use page 45

The printer prints an operation check page including your
printer's ROM version information, the ink counter code, and
a nozzle check pattern. Here are sample printouts.
Good sample
Print head needs to be cleaned
The above sample is in black and white, but the actual test prints in color
(CMYK).
If the nozzle check page does not print satisfactorily (for
example, if any segment of the printed lines is missing) there
is a problem with the printer. This could be a clogged ink
nozzle or a misaligned print head. See the next section for
details on cleaning the print head. For information on aligning
the print head, see "Aligning the Print Head" on page 42.
segments are missing
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