Brother LX-910D - Manual (Page 19)

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(8) Check the position of the top edge of film. It
should be aligned with the cutting line of the
cartridge. If any film extends beyond the
cutting line, cut away the access film as
illustrated before installing the cartridge.
(9) Install the cartridge into the machine.
(10) Return the roller holder to the original
position and press the roller holder lock
buttons (purple color) as illustrated. You will
hear the roller holder click into place. Press
the roller holder further to secure the roller
unit.
(11) Close the top cover.