Epson EcoTank Pro ET-5150 Wireless All-in-One Supertank Printer - Manual (Page 279)

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You see a window like this:
5. Click Start to begin the cleaning cycle.
The power light flashes throughout the cleaning cycle and stays on when the cleaning cycle is
finished.
Caution: Never turn off the product or open the scanner unit 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 .