Brother LX-1200 Owner's Manual page 30

(7) Press on the two shutter buttons marked
"PUSH" to release the shutter.
(8) The top edge of film should be aligned with the
cutting line of the cartridge. If any film extends
beyond the cutting line, cut away the excess
film as illustrated before installing the cartridge
into the machine.
(9) Install the cartridge into the machine.
(10) Return the roller holder to its original position
and press the roller holder levers as
illustrated. You will hear the roller holder click
into place.
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