Brother HL-3450CN - Manual (Page 130)

CHAPTER 5 MAINTENANCE
5-14
Replacing the Fuser Cleaner
! Warning
The Fusing unit and the parts around it are HOT! Be sure to wait until
the Fusing Unit has cooled sufficiently before replacing the Fuser
Cleaner.
If you touch the HOT parts, you might get injured.
1. Press the Power button to turn the printer off and wait until it has cooled
down sufficiently.
2. Open the Top Cover.
3. Release the Fuser Cleaner Lock
Levers on both sides as shown:
Fig. 5-7