Brother LX-1200 Owner's Manual page 38

(5)Slide the old side cutter towards the center of
the machine. Remove the side cutter.
(6)Place the new side cutter on the metal bar and
slide it towards the side of the machine.
(7)When the cutter is in the correct position lift
the tab and bring it upwards towards the front
of the machine to lock the side cutter into
place.
Repeat this procedure for both cutters.
(8)Return the roller holder levers to its original
position.
Note
If side cutter units are not installed properly,
the roller holder will not return to its original
position.
Make sure that film cartridge is installed
properly after returning the roller holder to its
original position.
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