Brother DR-520 Drum Unit - How do I clear the message Replace Drum?

This message will appear if the drum unit is at the end of its life.

The drum unit part number is the DR520. The drum unit is a consumable item that requires periodic replacement.

There are many factors that determine the actual drum life, such as temperature, humidity, type of paper and how much toner you use for the number of pages per print job. The estimated drum life is up to 25,000 pages in accordance with ISO/IEC 19752. The actual number of pages your drum will print may be significantly less than these estimates. Because we have no control over the many factors that determine the actual drum life, we cannot guarantee a minimum number of pages that will be printed by your drum.

To replace the drum unit follow the instructions listed below or to view instructions with graphics click here

1. Press the cover release button and then open the front cover.
2. Remove the old drum unit and toner cartridge assembly. Place it on a drop cloth or disposable paper to avoid scattering toner.
3. Hold down the blue lock lever on the right and pull the toner cartridge out of the drum unit.
4. Wait to unpack the new drum unit immediately before installing it. Place the old drum unit into the plastic bag and discard it according to local regulations.
5. Reinstall the toner cartridge into the new drum unit.
6. Reinstall the new drum unit, keeping the front cover open.
7. Press the CLEAR/BACK key.
8. Press 1 to select YES. When the LCD shows Accepted, close the front cover.