Epson Stylus Color 850 User Manual page 181

Nozzle check pattern:
Good sample
Print heads need to be cleaned
The above sample is in black and white, but the actual check pattern
prints in color.
In the check pattern, if you find that any segments are missing
from the test lines as shown above, you may need to repeat the
head cleaning and print the nozzle check pattern again.
If print quality does not improve after repeating this procedure
four or five times, try other recommendations listed in this
chapter. If the print quality still does not improve, contact your
dealer.
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Troubleshooting
any segments are missing