Canon imageRUNNER 6570 Reference Manual page 512

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Clearing Paper Jams
Open the front cover of the finisher.
If the optional Puncher Unit-M1 is attached to the main unit, and paper has
jammed between the puncher unit and the finisher, open the front cover of the
punch waste tray, and then open the top cover of the puncher unit to remove any
jammed paper.
The Optional Saddle Finisher-T2
Open the top cover of the finisher.
The Optional Finisher-T1