Brother LX-900 Owner's Manual page 32

(5) Slide the old side cutter to the center. Remove
the side cutter.
(6) Slide the new side cutter to secure it in the
side cutter holder.
(7) Lift the tab to lock the side cutter into place.
(8) Return the roller holder lock button (purple
color) to its original position.
Note
If side cutter units are not installed properly,
the roller holder cannot be returned to the
original position.
Make sure that film cartridge is set firmly when
returning the roller holder to its original
position.
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