toner cartridge and drum unit for Brother printer
What is the difference between the toner cartridge and the drum unit for my Brother printer?
The toner cartridge and drum unit are different consumables. They are used in the Brother machine, and the machine requires both consumables.
What is the toner cartridge?
The toner cartridge contains powder (toner) used for creating letters and images.
You need to replace the toner cartridge when the toner is running short or print quality becomes poor because of toner deterioration.
The drum unit transfers the toner to the paper.
The laser printer puts the toner on the roller called "The photosensitive drum" inside the drum unit, and then prints letters and images by fixing toner to the paper by heat and pressure.
To keep good print quality, the Brother machine detects the quality deterioration of the drum unit automatically. If the Brother machine displays "Replace drum" error message, you need to replace the drum unit.