Brother HL-3400CN Series - Manual (Page 42)

USER’S GUIDE
2–12
6. Place the Fuser Cleaner into the Fusing Unit with the roller side facing you.
Fig. 2-19 Install the Fuser Cleaner
7. Lock the Fuser Cleaner in place by turning the Fuser Cleaner Lock Levers.
Fig. 2-20 Lock the Fuser Cleaner Lock Levers
8. Close the Top Cover.