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In this video we are going to show you how to replace the BU 100 CL Belt Unit in a Brother
HL4040 CN or similar model Printer. Start by opening the front cover of the printer
by pressing the cover release latch on the top of the cover.
Pull up on the handle of the drum unit to slide it out.
Place the latch in the upright position, then lift out the drum unit and cartridges.
The belt unit is located directly below the drum unit.
Lift up on the green tab and carefully remove the old belt unit.
Prepare the new belt unit by removing all packaging. Do not touch the surface of the
belt unit. Slide the new belt unit into the printer and
press down on the green tab until it clicks into place.
Place the drum unit back into the printer, put the latch into the down position, and
slide the drum unit back into the printer until you hear the click.
Make sure the handle is in the upright position. Close the front cover and the printer is ready
to use.