Cleaning The Print Head - Epson STYLUS PHOTO R300 Series Operation Manual

6. The nozzle check pattern is printed out. See the following
illustration. If it is necessary to clean the print head, press the
OK button, then select Head Cleaning.
The printer will print an operation check page that includes a
nozzle check pattern. Below are sample printouts.
Good sample
Print head needs to be cleaned
The above sample may be shown 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.

Cleaning the Print Head

If you find that the printout is unexpectedly faint or that dots are
missing, you may be able to solve these problems by cleaning the
print head, which ensures that the nozzles are delivering ink
properly.
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Segments are missing