Toshiba E-STUDIO230/280 - Manual (Page 279)

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5 Pull out the seal holding the staples
straight upward.
6 Return the staple cartridge to its original
position.
- Insert the cartridge until it is caught by the latch and fixed with a
click sound.
If “Check staple cartridge” remains, repeat the above procedure
from step 1 to 6.
7 Install the finisher to the equipment.
Be careful not to let your fingers be caught between the equipment
and the finisher (optional).
This could injure you.