Just refilled a nearly new Brother DR2000 and

Assuming you have tried to replace an empty toner with a new or refilled toner cartridge. Some of these machine simply fail to recognise the reset activation lever on the side of the cartridge. You could try removing the end cap at the geared end. You will find a half moon shaped gear which needs to be lifted out slightly and rotated a quarter turn clockwise. replace any other gears and refit the cover. This resets the toner cartridge to "new" state. If you printer doesn't recognise this, you will need to get a manual reset keycode from brother. Please note - some folk reset used cartridges this way and re-use them. Used toner will contaminate the drum and give poor print. Any residual contaminated toner on the drum can contaminate a new cartridge and so-on. Refilled cartridges are fine if the cartridge is completely cleaned out first.

You can, but it a dirty job. I would not recommend it as the toner powder is very fine and you don't want to breath in this toner powder.
If you don't want to purchase a new toner cartridge, then I recommend you buy a re-manufactured toner cartridge for your model printer. They cheaper than the new Brother toner cartridges and usually contain more toner and the drum cartridge components have been refurbished.

Toner Blinking yellow LED indicates that the toner cartridge is nearly empty. Buy a new toner cartridge or refill the cartridge. Refilling the TN cartridges is quite simple and you can do it yourself.
It is a very simple process. Please refer to this video.

Let me know if any further clarification/ assistance is required.

Good Luck!
Appreciate generously, if the solution could have been of any help!
CreativeTECH

The toner cartridges have a small port on the side that the printer uses to check the toner level. Our 7440N tells us it will soon need a new toner cartridge and will then print another 400 copies. Search YouTube for Brother Toner Cartridge and it will show you how to modify the cartridge by covering up the portholes with tape. Since there is obviously some kind of sensor, you might need to get a can of air and clean out any extra toner. Lastly, the Brother cartridges have "reset gears" which are replaced when the cartridges are refilled. You might have a cartridge which the gears were not replaced on.

I replaced already new toner cartridge for my brother fax machine mfc-2820 but still the on screen message is appearing on the display "TONER LIFE END".
Pls help me to solve this problem.

That is normal with this printer. I own a Cartridge World ink and toner refilling store and we've found that the new Brother color laser machines (that take the TN-110 or TN-115) drop toner speckles onto the pages. This is because the cartridges were designed poorly. We do not recommend new Brother color laser machines for this reason.

Drum for Brother MFC-6800 All in One Machine
You can expect it to print 12,000 Page Yield
Whats the difference between a DRUM and a TONER Cartridge? The toner cartridge is a cartridge holding the toner (ink). The drum does the work to transfer the ink to the paper. You will need to replace the drum every 5-6 toner cartridges you use.

There is a certain position for the gears of the toner cartridge so the machine detects it is a new one. This is because they can be refill. Find out the right position viewing a new cartridge gears. Good luck

if you are refilling the cartridge for the tn350 or the tn2000 - its very easy. Remove the cap from one side - empty then refill. The opposite end has a reset gear that you need to rest. if you have the starter cartridge you will need to buy the gear...

visit these guy and they will sort you out

http://www.tonerangel.us/Brother_TN350_Toner_Refill_Kit-details.aspx

On the side of the cartridge (TN2000) there is a white reset flag, this need to set to twevle 'o' clock, thats towards the black roller. If that hasn't been reset the cartridge will register as low.