Canon imageRUNNER 2320 Reference Manual page 260

Check document
Cause
Remedy
Data error/Repairing data
Cause
Remedy
Document too long
Cause
Remedy
Drawer 2 cover open/Close cover
Cause
Remedy
Drawer 3 cover open/Close cover
7
Cause
Remedy
Drawer 4 cover open/Close cover
Cause
Remedy
Drum is not set/Insert the drum
Cause
Remedy
7-32
List of Error Messages
A paper jam may have occurred in the feeder.
Remove the jammed document.
The machine may have trouble.
Contact your local authorized Canon dealer if the problem persists.
The original that you are trying to copy is too long for the feeder.
Scan the original on the platen glass.
The left cover of Paper Drawer 2 is open.
Close the paper drawer's left cover.
The left cover of Paper Drawer 3 is open.
Close the paper drawer's left cover.
The left cover of Paper Drawer 4 is open.
Close the paper drawer's left cover.
The drum unit has not been installed.
Install the drum unit. (See "Replacing the Drum Unit," on p. 6-16)