Epson Stylus COLOR 440 Manual page 124

Troubleshooting
The printer prints one page containing the printer's ROM
version, ink counter code, character table number, and a
nozzle check pattern. Only the nozzle check pattern is shown
below:
5 After it prints the page, turn off the printer. Remember to
reconnect the interface cable, then turn on the printer and your
computer.
6 Compare the quality of the printed nozzle check pattern with
the sample above. In particular, look for missing segments in
the lines, which may indicate a misaligned print head or
clogged ink nozzle.
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