Epson Expression Photo XP-8700 Wireless All-in One Color Printer - Manual (Page 250)

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You see a screen like this:
5. Select Print Head Cleaning .
You see a screen like this:
6. Select Start to clean the print head.
The power light flashes throughout the cleaning cycle and stays on when the cleaning cycle is
finished. When the cleaning cycle is finished, you see a message on the screen.
Caution: Never turn off the product or open the scanner unit during a cleaning cycle or you may not
be able to print.