Brother MFC 7820N
here is the options button on the mfc7820n

How to Identify and Fix Common printer Problems ?

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The Brother machine will display a `Replace Drum` or `Drum Stop` message when the machine has printed approximately 15,000 pages. The drums should be replaced as a set in order to maintain print quality. Unlike the toner cartridges, the drum change is not automatically detected by the machine when they are replaced.
If your machine continues to display “Replace Drum” after installing a new drum, the drum counter may not have reset properly. Whenever you replace the drum unit, the drum counter needs to be reset.
You want it to dry fairly quickly, but you do not want to use extreme heat: 70 to 80 degrees is good. It should be completely redried in one to two days. After you have done this to your drum once or twice over a period of time, you will find it will stay tight, even in fairly cool and humid conditions.
Separate drum units last quite a bit longer than a toner cartridge and typically should be replaced after the use of 3-4 toners. Your printer should inform you when it`s time to replace the drum, but you can usually tell your drum is on it`s last legs if you start to see black spots or lines across the page.
15,000 pages (1 page/job). There are many factors that determine the actual drum life, such as the temperature, humidity, type of paper, type of toner used and so on. Under ideal conditions, the average drum life is estimated at approximately 15,000 pages.
The message Drum End Soon indicates the drum unit will need to be replaced soon. Even when the LCD or the status monitor displays the message Drum End Soon, you can still continue to print.
Shelf life is a period of time the components can be stored and still be suitable for use. A laser printer drum`s shelf life is approximately two years if the drum is still in its protective bag. Leave your printer`s drum in its protective bag until you`re ready to install the component.
What is the drum unit? 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.
Right-click “Print Spooler” and select Stop.

Within the Services window, find and right-click on the Print Spooler option. From the dropdown menu, select the Stop option. This will end the spooling service and cancel any documents in the printer queue.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Brother mfc-L2720DW – Change Langage
ANSWER : Item #4 to change language. http://mans.io/files/viewer/52142/1

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Brother MFC 7820N

toner cartrigdes and drums
ANSWER : You can, but there are good knock-offs and bad ones. I’ve run into ones that come totally empty. Ones that don’t have the chips installed that identify themselves to the printer. Ones that have sat on a shelf for years and fail on installation. I could go on, but I’m sure you get the idea. I use http://directpreciseimaging.com/ Mostly because I set him up in business and he’s local to me. I have very few problems with his products.

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Brother MFC 7820N

Changing DPI
ANSWER : The resolution varies depending on the printer driver setting.

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Brother MFC 7820N

image drum message
ANSWER : You don’t have to replace it until it wears enough to affect the print quality. You’ll get spots or stripes. Here you go on a free reset. If you read the thread, someone says the procedure also works on your model. http://www.fixyourownprinter.com/posts/33634

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Brother MFC 7820N

RESET OKIDATA TONER DRUM
ANSWER : HI there, oki image drums contain a fuse. You can reset them if they are working/printing ok by replacing the fuse. Hope this helps. The fuse is located inside the unit so is a bit fiddly.

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Brother MFC 7820N

Drum reset
ANSWER : This forum thread covers the reset procedure

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Brother MFC 7820N

oki c511 drum reset, toner reset, turkey chip reset
ANSWER : If you switch off toner control, you should keep an eye on your prints, and we aware of ink quality, so filling colours as they’re emptying. Nevertheless, it’s an small disturb for the a,ount of money you’re saving ┬┐isn’t it?

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Brother MFC 7820N

Color LaserJet 2500 new drum doesn't work.
ANSWER : The drums have a chip on them and it should have reset when you installed it. If not, then read this thread.

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Brother MFC 7820N