Kyocera FS FS-3900DN Operation Manual page 41

OPERATION GUIDE
2 Close the cap to the old waste toner box after removing the box from the
printer.
3
To prevent toner from spilling, put the old waste toner box in the plastic bag
(contained in the toner kit) and discard it later according to the local code
or regulations for waste disposal.
Plastic Bag
4 Open the cap of the new waste toner box.
Cap
Maintenance
Cap
Old Waste Toner Box
New Waste Toner Box
3-7