When I installed the drum unit in my Brother Intellifax model 2820, 2910, 2920, 7220, 7225N the light still says to replace the drum unit. What do I do?

The drum for your machine has an approximate life of 12,000 pages, thus you should only have to change it every 4-5 toner cartridges used. When you do replace the drum unit, you need to reset the counter to get the light off. Once you install the toner cartridge in the new drum unit, slide the entire unit back into the machine. Don’t shut the door yet. Then press the “options” button on the dashboard of the machine. When it says “replace drum unit” hit the #1 to say yes. It will then say accepted. Shut the door and begin printing, etc.