Epson SureColor T3170M 24" Wireless Printer, Scanner & Copier - Manual (Page 206)

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You see a screen like this:
3. Select 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.
4. Select Yes > Start to print a nozzle check pattern.
The nozzle pattern prints.