Canon LBP-800 Getting Started Manual page 10

Do not stand the cartridge on end, or turn it upside down. Toner could
become caked in the cartridge resulting in poor print quality.
Keep the cartridge away from a monitor's cathode ray tube (CRT),
disk drives, and floppy disks. The magnet inside the cartridge can
destroy the image data in the CRT, or data on the disks.
CAUTION:
Do not dispose of toner cartridges in fire. Toner powder is flammable.
1. Remove the cartridge from its protective bag.
Save the protective bag. You may need to repack and transport the
cartridge at a later date.
2. Gently rock the cartridge from side to side five or six times. This
evenly distributes the toner inside the cartridge. Uneven toner
distribution causes poor print quality.
10
Installing the EP-22 Cartridge