How do I change the sleep timer setting on the ET-2980U?
Press the home button, then select Settings > Printer Setup > Sleep Timer. Press the left or right arrow button to move the cursor and press the up or down arrow button to adjust the number of minutes of inactivity before the product enters sleep mode. Then press the OK button and the home button to exit. (Page 21)
From the official Epson EcoTank ET-2980U All-in-One Printer manual, page 21
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