Canon Color ImageRunner C3380 Reference Manual page 446

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Clearing Paper Jams
Open the lower right cover of the cassette feeding unit.
If the optional Paper Deck-Z1 is attached to the main unit, move the paper deck
away from the main unit before proceeding with this procedure. For more
information, see "Paper Deck-Z1," on p. 3-13.
Remove any jammed paper.
Press and release the button on the paper drawer indicated on
the touch panel display.