Canon imagePRESS C1+ Reference Manual page 554

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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-AA2
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-AA1