How do I change the sleep timer setting on the ET-2803?
Press the home button, select Settings and press OK, select Printer Setup and press OK, then select Sleep Timer and press OK. Use the arrow buttons to adjust the number of minutes of inactivity before the product enters sleep mode, then press OK. Press the home button to exit. (Page 20-21)
From the official Epson Et-2803 Printer manual, page 20
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