Epson Stylus CX5800F - Manual (Page 10)

10 Copying a Photo or Document
If you need to copy or scan a thick or large document, you can remove the
document cover. Just open it and pull it straight up.
If you need to press the document flat while you copy or scan it, do not press too
hard and be careful not to move it.
Caution:
Do not use excessive force on the document cover, and do not twist it. You may
damage the document cover.
When you are done, replace the document cover by inserting the tabs back into
the slots.