Brother HL-3450CN - Manual (Page 147)

CHAPTER 5 MAINTENANCE
5-31
Replacing the Drum Cleaner
! Caution
Both ends of the Drum Cleaner roller consist of metal bearings that connect
the bias element to the power supply. When you install the Drum Cleaner,
the metal bearings must be connected correctly. Be sure to check how they
are connected by referring to the old Drum Cleaner before you begin
replacement.
1. Press the Power button to turn the printer Off, and then unplug the
printer.
2. Open the Top Cover.
3. Remove the Drum Cleaner
Cover.
Fig. 5-27
4. Remove the Drum Cleaner by
lifting it up and out of the printer
with both hands.
Fig. 5-28