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I have a Brother MFC7820N. The copies are terrible. I cleaned the corona wire. My question is, how do I clean/refurbish the drum?

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I fixed the problem myself. When I looked carefully at the drum assembly (Brother part DR350) I figured out how to remove the top cover. So I put on some gloves and, after buying a box of alcohol wipes, I sat at the kitchen table FOREVER trying to remove a retaining pin. It really wasn't that hard, it was mostly due to my inexperience and the fact that I'm female with not much hand strength.
The drum was covered with stuck on toner. The plastic assembly and the drum were both easily cleaned by alcohol wipes, compressed air, and Rags-in-the-Box (a thick, mostly lint-free cloth). I strongly recommend going outside to use compressed air to clean out the vents/fins ... you will see toner shooting out in a fine mist EVERYWHERE.
Once everything was clean I reassembled it but found I could only put it together with the gears on the opposite side of where they were originally. I knew that wasn't how I'd found it but let it go and tried printing. Everything went well for about 4 copies then every page jammed - I don't know why the first ones went through without a hitch.
Boy is there a difference between doing something once vs. not having any experience! This time I knew I didn't have to remove the retaining pin before I lifted off the top piece and exposed the drum. Life is much easier if you wait to take off the retaining thingy after you remove the top. Disassembly and reassembly went much faster the second time. Now I could probably do it in less than 15 minutes flat.
TIP: to remove the top you place the drum assembly flat in front of you with the back of the assembly facing you. Then gently rock the top piece toward you and lift up and out.
TIP: wear gloves (nitrile or latex-free work well) and NEVER touch the drum with your fingers. 
TIP: When you remove the axle rod (long thin piece of metal which runs through drum) there are two thin strips of metal which narrow and don't allow the rod to be put back through unless separated.
I was worried the alcohol might damage the coating on the surface of the drum so I wiped it with a lint-free cloth as soon as possible. It seemed to work out okay. I've printed over a hundred copies in pretty short order since I put the machine back together and the print quality is just as good as new. 
FYI: when I first powered up the printer, there was a smell I attributed to alcohol being burned off. I was concerned I might have created a fire hazard (not a good thing) and seriously considered chucking the whole drum assembly. If I had to do it again, I'd make certain to rub the alcohol off the drum faster. In the end, the smell burned off very quickly. 

Posted on Aug 30, 2008

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We recommend you place the drum unit on a drop cloth or large piece of
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The corona wire on the drum unit
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or

The drum unit has reached the
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Replace the drum unit.
(See Replacing the drum unit on page 130.)

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