Replacing the cartridge
Open the front cover.

finisher(4K)-cover_open.jpg
Squeeze the green parts of the staple case and pull the case up and then out.

finisher(4K)_staple-case_out.jpg
Remove the empty staple cartridge.
Press the lock button to release the staple case cover and then remove the staple cartridge.
When staples remain, the staple cartridge cannot be removed.

finisher(4K)_staple_out.jpg
Insert a new staple cartridge into the staple case.
Push the staple cartridge in until it clicks into place.
Do not remove the seal from the cartridge before inserting the cartridge into the case.

finisher(4K)_staple_set.jpg
Pull the seal that holds the staples straight out.

finisher(4K)_staple-seal_pull.jpg
Push the staple case firmly back in.
Push the staple case in until it clicks into place.

finisher(4K)_staple-case_insert.jpg
Close the front cover.

finisher(4K)-cover_close.jpg
Make a test print or copy in staple sort mode to verify that stapling takes place correctly.