Cleaning The Print Heads - Epson Stylus PRO 10000CF Startup Manual

If any segments of printed lines are missing in your nozzle check
pattern, ink nozzles are clogged and the print heads require
cleaning.
c
Caution:
Make sure that the nozzle check pattern printing is complete
before you start printing. Otherwise, print quality may decline.

Cleaning the Print Heads

You can execute the head clean from your computer using the
Head Cleaning utility in the printer software, as explained in the
following steps.
Note:
Print head cleaning uses ink. To avoid wasting ink, clean the print
heads only if print quality declines.
Use the Nozzle Check utility to confirm that the print heads need to
be cleaned, as this uses only a little ink.
When an Ink Out light is flashing (ink low) or on (ink out) in the
printer, you cannot clean the print heads before replacing the
appropriate ink cartridge first.
Do not start the Head Cleaning or Nozzle Check utilities while
printing is in progress; otherwise, your printout may be marred.
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Checking the Printer's Condition