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The fact that the light bulb is out *and* the drum continues to spin when the door is opened - all point to a faulty door switch.
This switch tells the machine the "status" of the door position. When the door is open, it turns on the light *and* stops / prevents the drum from starting. When closed, the light is shut off *and* the drum is permitted to spin. You should have the switch serviced as if a wire came loose it adds a potential shock hazard - in addition to the safety issue of placing hands into a spinning drum.
as far as the drum not stopping when door is opened that will be a bad door switch the noise could be anything from a drum support roller to a blower wheel,the bearing on the motor,the rear drum bearing or even something such asa coin caught between the drum felt seal and the drum nosies a hard to diagnose online since they dont sound the same in written form
The drum is the part of the unit that actually does the transfer of the toner onto the paper. Each toner cartridge does about 2,000 pages and the drum needs to be replaced with the ~6th toner cartridge change (varies with use). Order part DR-250 from Brother or any office supply place that would carry the part.
To replace (wait until print quality decreases or it reads change drum now and stops working). Turn off the unit and let it cool. Close the document tray and the extension and open the top cover. Remove the drum carefully and place it where the toner will not spill. Remove the toner cartridge (if it is still good) and set it aside to put in the new drum. Wrap the old cartridge up and dispose of properly (not in the domestic trash). Keep the new drum out of the light (keep it sealed until needed) as much as possible. Insert the toner cartridge in the new drum. Then insert the unit into the Fax machine. (Hold by the handles) Close the top cover and the starter sheet should be ejected by the machine.
The drum light is on due to a preset counter to notify you that the drum has reached the end of Normal Usage life expectancy. It doesn't mean that it has failed, yet...but soon. I would suggest having a new drum on hand for when print quality starts failing. Either new drum units have a reset fuse in them to clear the warning light, or there is a reset proceedure to use after installing the new drum unit.
The drum is where the image is applied before being transfer to the paper. If the drum is wearing down the image will become poor. Changing the drum unit will make the image like new. So, yes you can run the drum catridge until you get a poor print out.