Brother HL 5370DW - Manual (Page 108)

Routine Maintenance
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d Unpack the new toner cartridge. Gently shake it from side to side several times to distribute the toner
evenly inside the cartridge.
IMPORTANT
Wait to unpack the toner cartridge until immediately before you put it in the printer. If toner cartridges are
left unpacked for a long time the toner life will be shortened.
If an unpacked drum unit is put in direct sunlight or room light, the unit may be damaged.
CAUTION
Put the toner cartridge in the drum unit immediately after you have removed the protective cover. To prevent
any degradation to the print quality, DO NOT touch the shaded parts shown in the illustrations.