Canon imageRUNNER 3530 Reference Manual page 328

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Finisher-S1/Puncher Unit-R1 (Optional)
Open the front cover of the finisher.
Lift the handle of the finisher unit up, and then pull it out to the
left.
CAUTION
Do not place any objects on the finisher unit, or lean on it, as doing so may
damage the machine, or cause the machine to fall over, resulting in
personal injury.