Epson AcuLaser MX20DNF - Manual (Page 41)

Note:
When the size of the paper that is loaded is bigger than A4, detach the green stopper and attach it to
the paper guide.
3. Load a stack of the desired paper on the center of the paper cassette with the printable surface
facing down.
Epson AcuLaser MX21/MX20 Series User's Guide
Paper Handling 41