Toshiba E-STUDIO230/280 - Manual (Page 283)

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5 Return the staple cover to its original
position while holding the knob.
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.
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.