Epson WorkForce Pro WF-6090 Printer with PCL/PostScript - Manual (Page 179)

You see a window like this:
5. Click Start to begin the cleaning cycle.
Caution: Never turn off the product or open the front cover during a cleaning cycle or you may not
be able to print.
6. When the cleaning cycle is finished, you can check to see if the nozzles are clean; click Print Nozzle
Check Pattern and click Print .
7. Check the printed pattern to see if there are gaps in the lines.
Print head is clean
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