Canon DR-3080CII - Manual (Page 43)

Using the Scanner 41
Installing the Document Eject Guide
When scanning a document that is particularly thin or particularly long, it
could droop down over the edge of the document eject tray extension and
become jammed in the scanner. Avoid this problem by attaching the
document eject guide.
1.
Grasp the edge of the document eject tray extension and lift it up.
2. Attach the Auxiliary paper support plate to the document eject tray extension.
3.
Gently open the document eject tray extension towards you.