Canon imageRUNNER C3489 Reference Manual page 466

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Clearing Staple Jams
Return the tab on the staple case to its original position.
Gently push the staple case back into the stapler unit until it is
securely in place.
Close the front cover of the finisher.
The Optional Saddle Finisher-Y2
CAUTION
When closing the front cover of the finisher, be careful not to get your
fingers caught, as this may result in personal injury.
The Optional Finisher-Y1