Canon imageRUNNER C3489 Reference Manual page 364

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Finisher-Y1/Saddle Finisher-Y2/Puncher Unit-M1 (Optional)
Open the front cover of the finisher.
The Optional Saddle Finisher-Y2
Lift and pull out the staple case from the stapler unit, holding
it by its green tab.
Place the staple case, as shown below, press the area
indicated by PUSH, and then pull out the staple cartridge.
The Optional Finisher-Y1