Epson WorkForce Pro WF-M5799 Workgroup Monochrome Multifunction Printer with Replaceable Ink Pack System - Manual (Page 79)

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2. Slide the front edge guide outward all the way, then slide the side edge guides to the paper size you
are using.
3. Load paper with the printable side facedown and slide the front edge guide against the paper.
Note: Make sure the paper fits beneath the arrow mark inside the edge guides.