Brother LX-1200 Owner's Manual page 28

(4) Take the new refill roll of film from the sealed
package. Remove the separator sheet.
Holding the yellow colored plastic side holders
of the film roll. Place the film into the cartridge
as illustrated. The film can only be placed into
the cartridge in the correct direction.
Note
Remove the separator sheet between film rolls
before placing the rolls into the cartridge.
Do not grasp the rolls when installing.
9" and 4.8" refill rolls may have different side
holders. Please refer to the directions that are
packed with the refill roll.
(5) Remove the side holders (yellow color) of the
film roll.
(6) Close the film cartridge. Making sure that the
leading edge of the film sticks out of the film
slit.
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