IBM 1800409-001A - Manual (Page 48)

7. Hold the toner cartridge as shown in figure 2.10, and shake it
horizontally. This distributes toner evenly inside the cartridge
and helps assure quality printing.
Fig. 2.10 Distribute Toner in Cartridge
Chapter 2
2 - 1 6 I n i t i a l P r i n t e r S e t u p