Brother HL 5370DW - Manual (Page 114)

Routine Maintenance
104
6
IMPORTANT
Handle the toner cartridges carefully. If toner scatters on your hands or clothes, wipe or wash it off with cold
water at once.
To avoid print quality problems, DO NOT touch the shaded parts shown in the illustrations.
d
Unpack the new drum unit.
IMPORTANT
Wait to unpack a drum unit until immediately before you put it in the printer. Exposure to direct sunlight or
room light may damage the drum unit.
e Put the toner cartridge firmly into the new drum unit until you hear it lock into place. If you put the cartridge
in properly, the blue lock lever will lift automatically.
Note
Make sure that you put in the toner cartridge properly, or it may separate from the drum unit.