Canon imageRUNNER C3489 Reference Manual page 438

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Clearing Paper Jams
Pull down any one of the four inner guides, and remove any
jammed paper.
Remove any jammed paper protruding from the output tray.
IMPORTANT
If a paper jam occurs when you are printing in the Staple mode, do not remove the
output sheets that are waiting to be stapled. (Printing and stapling resume after you
clear the paper jam.)
Push the paper output unit back into its original position.
CAUTION
When pushing the paper output unit back into its original position, be
careful not to get your fingers caught, as this may result in personal injury.