Panasonic DP-2500 Operating Instructions Manual page 52

Accessories
Finisher/Exit Guide Unit
3. Replacing the Staple Cartridge
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The message shown on the left
appears when the staples run out.
Hold the latch and pull out the
Finisher.
Remove the Staple Cartridge.
# Remove the empty Staple Case.
$ Install the new Staple Case.
Pull out the tape.