Brother DCP-L8400CDN Basic User's Manual page 74

f
Unpack the new belt unit and install the
new belt unit in the machine. Make sure
the belt unit is level and fits firmly into
place.
66
g
Make sure the blue lock lever (1) is in
the release position as shown in the
illustration.
1
h
Gently slide the drum unit into the
machine until it stops at the blue lock
lever.
1
2