Epson SureColor T3170M 24" Wireless Printer, Scanner & Copier - Manual (Page 204)

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You see a window like this:
4. Click Start to begin the cleaning cycle.
When the cleaning cycle is finished, the power light stops flashing and a confirmation screen
appears.
Caution: Never open any covers or turn off the product during a cleaning cycle or you may damage
it.
5. Click Print Nozzle Check Pattern .
The nozzle pattern prints.