Brother HL-3400CN Series - Manual (Page 170)

CHAPTER 5 MAINTENANCE
5-13
1. Open the Front Cover.
2. Remove the Waste Toner Pack from the holder located at the
lower right side of the printer. Be careful not to spill the toner.
Fig. 5-11 Take the Waste Toner Pack out
3. Peel off the sealing sticker on the right side of the Waste Toner
Pack. Seal the opening with the sealing sticker. See Fig. 5-12 for
the correct placement of the sticker.
When you dispose of the used Waste Toner Pack, place it in
the plastic bag included with the replacement Waste Toner
Pack. Please dispose of the Waste Toner Pack in accordance
with local regulations.
Fig. 5-12 Seal the Sealing Sticker
4. Insert the new Waste Toner Pack into the Waste Toner Pack
Holder.
5. Close the Front Cover.