Epson WorkForce ST-M3000 Monochrome MFP Supertank Printer - Manual (Page 247)

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You see this screen:
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.