Epson Expression Premium XP-7100 Small-In-One Inkjet Printer - Manual (Page 56)

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4. Slide out the upper paper cassette.
Note: If the cassette is too far inside the product to reach, turn off your product and turn it back on
again to reset the cassette's position.
5. Slide the edge guides outward.
6. Slide the front edge guide to the position for the paper size you want to use.