Brother HL 4150CDN - Manual (Page 141)

Routine Maintenance
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h
Slide 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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2
3