Brother HL-3400CN - Manual (Page 176)

CHAPTER 5 MAINTENANCE
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. 5-21 Removing the Fusing Unit
!
Caution
When removing the Fusing Unit from the printer, be sure to keep the
Fusing Unit flat, so oil will not spill. Damage can occur if oil is spilled
inside the printer.
5. Remove the Oil Bottle and the Fuser Cleaner from the Fusing Unit.
6. Install the new Fusing Unit into the printer. Be sure to insert the Fusing
Unit completely into the printer.
Fig. 5-22 Installing the New Fusing Unit