How do I place an original document on the scanner glass of the ET-2400?
Open the document cover and place your original facedown on the scanner glass with the top facing into the corner, sliding it to the edges of the indicated corner. The maximum original size supported is Letter (8.5 x 11 inches) or A4 (8.3 x 11.7 inches). Close the document cover gently to keep your original in place, and do not push down on the document cover or scanner glass as this may damage the product.
From the official Epson ET 2400 manual, page 44
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