Epson Stylus Photo RX510 Operation Manual page 79

5. Check the printout. The following examples indicate when the
print head needs to be cleaned.
Good: print head does not need to be cleaned yet.
Not Good: print head needs to be cleaned.
The actual printouts are printed in color (CMYK).
If the nozzle check result is not good, there is a problem with this
product. It may be a clogged ink nozzle or a misaligned print head.
To solve these problems, see the next two sections for details.
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Maintenance and Transporting