Epson WorkForce Pro WF-M5799 Workgroup Monochrome Multifunction Printer with Replaceable Ink Pack System - Manual (Page 81)

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Paper Loading Capacity
Related tasks
Loading Paper or Envelopes in the Rear Paper Feed Slot
Loading Paper or Envelopes in the Rear Paper Feed Slot
You can print envelopes or documents in a variety of paper types and sizes in the rear paper feed slot.
1. Open the feeder guard and pull up the paper support.
2. Slide the edge guides outward.