Epson ES-1200C - Manual (Page 33)

Removing the document cover
For especially difficult documents or other materials, you
can completely remove the document cover. Just raise it
completely; then pull it off in the direction of the arrows in
the illustration below.
Reattach the document cover reversing the procedure above.
Be sure to hold the cover in a vertical position as you slip its
attachments into place.
2-8 Scanner Basics