Brother  HL-4140CN User Manual page 194

h
Put the belt unit back into the machine.
Make sure the belt unit is level and fits
firmly into place.
i
Install orange packing materials to the
drum unit as follows:
 Install one orange packing material
(1) to secure the toner cartridges to
the drum unit on the left and right
sides respectively.
 Install one orange packing material
(2) to the drum's side surface on the
left side only, as viewed from the
front.
 Install one orange packing material
(3) to the drum's side protruding
section on the right side.
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