1
a.) Unplug the B721DN power cord from the wall.
b.) Remove the Paper Cassette from the printer
c.) Open the front and top cover and remove the Drum and Toner assembly.
2
Remove 3 screws from the upper right side
cover.
3
Remove 1 screw from the right side lower
cover.
4
Remove 2 screws from the rear cover.
5
Gently pull the rear cover away from the
printer. NOTE: The rear cover has 2 tabs
along the left and right edge at the top.
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