Epson Stylus Color 670 Manual page 149

The printer prints an operation check page including the version
of your printer's ROM, the ink counter code, and a nozzle check
pattern.
Compare the quality of the printed check page with the sample
shown below. If there are no print quality problems, such as gaps
or missing segments in the test lines, the printer itself is all right
and the problem probably lies in the printer software settings,
application settings, the interface cable (be sure to use a shielded
cable), or the computer itself.
The above sample is in black and white, but the actual check page prints
in color (CMYK).
If the check page does not print satisfactorily as shown below,
there is a problem with the printer. For example, if any segment
of the printed lines is missing, this could be a clogged ink nozzle
or a misaligned print head.
The above sample is in black and white, but the actual check pattern prints
in color.
segments are missing
Troubleshooting
9-7