How do I turn off the Operation Time Out setting on the ET-3850U?
Press the home button, then select Settings > General Settings > Basic Settings. Scroll down and set Operation Time Out to Off. This prevents the LCD screen from automatically returning to the Home screen after a few minutes of inactivity. (Page 24)
From the official Epson EcoTank ET-3850U All-in-One Wireless Printer manual, page 24
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