Brother HL-3450CN - Manual (Page 139)

CHAPTER 5 MAINTENANCE
5-23
Replacing the Fusing Unit
1. Press the Power button to turn off the printer. Unplug the printer. To avoid
injury, wait until the printer has cooled down sufficiently before replacing
the Fusing Unit.
2. Open the Top Cover.
3. Unscrew the two long screws as
shown to release the Fusing unit
from the printer.
Fig. 5-19
Note
Please wait for 30 minutes after installing a new Fusing Unit to allow
the oil to circulate completely through to the Heat Roller. If you begin
using a new Fusing Unit immediately, poor print quality may result.
4. Remove the Fusing Unit from the
printer by holding the handles on
both sides.
Fig. 5-20