Brother HL-5450DNT - Manual (Page 80)

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General Information
3
Drum End Soon
The drum unit will need to be replaced soon. We recommend that you get a new
drum unit to replace the current one.
See Replacing the drum unit uu page 105.
The Drum LED will turn on for 2 seconds and off for 3 seconds.
Replace Drum
Replace the drum with a new one.
See Replacing the drum unit uu page 105.
Drum Error
The corona wire needs to be cleaned. See Cleaning the corona wire
uu
page 112.
If the toner cartridge is placed in the machine without the drum unit, put the toner
cartridge into the drum unit, and then reinstall the drum unit and toner cartridge
assembly in the machine.
LEDs Machine Status