Sharp SF-S55N Service Manual page 23

4. Fit a new case of staples inside the staple cartridge.
Fit a new case of staples inside the staple
cartridge, in the way shown in the figure.
Make sure that the staple case is fitted securely in
place inside the staple cartridge.
Next, gently remove the seal from the staples.
5. Reinsert the staple cartridge.
Push the staple cartridge in horizontally until it
clicks securely into place.
6. Return the stapler to its original position.
Grasp the stapler's handle, and push the stapler
in gently as far as it will go, Then close the stapler
cover.
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SF-S55N