Sharp MX-C311 Operation Manual page 33

REPLACING SUPPLIES AND MAINTENANCE
Replace the staple case.
Push the staple case in until it clicks into place.
6
Slide the finisher back to the right.
Gently slide the finisher back to the right until it locks into its original position.
7
Close the cover.
8
Take care that your fingers are not pinched when closing the cover.
Make a test print or copy in staple sort mode to verify that stapling takes place
correctly.
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