Canon imageFORMULA DR-3080C Startup Manual page 36

3.
When scanning a large document, pull out the paper feed tray extension.
4.
Grasp the edge of the document eject tray extension and lift it up.
5.
Gently open the document eject tray extension towards you.
Note
Always be sure to open the document eject tray extension. If the guide is
not open when a document is scanned, the scanned document could droop
down and become jammed in the scanner.
To close the trays and extensions, follow the above procedure in reverse.
32
Using the Scanner