Toner Life End message on DCP-7040

Easiest way to find out how: go to youtube, search for reset and your printermodel. I found my reset method there.. Good luck.

I got this same error message on a newly acquired Brother DCP-7040 that I purchased used off of ebay.

As I was troubleshooting this unit (that I bought untested off of ebay - hey gambling has paid off handsomely for me many times before!), this error message kept popping up.

I checked the COUNTERS (page & Drum life) and found out that the DRUM had 0% life left. BUT, the reason it showed ZERO was because this unit did not have any drum! The toner cartridge (TN-360) needs to sit WITHIN the drum (DR-360) on this DCP-7040 unit, as well as in models DCP-7030, MFC-7340, MFC-7345C, and MFC-7440N.

So perhaps some of these "put the black toner cartridge back in" problems could be related to the DRUM (or lack thereof). A possible tipoff (since the toner cartridge actually does slide into the unit much like other units that do not use Brother's DRUM carrier) seems to be the relative ease with which the toner cartridge slides into the DCP-7040 and really doesn't seem to "lock" into position real firmly.

DCP-7040 USER GUIDES: http://welcome.solutions.brother.com/bsc/public/us/us/en/doc/manual_index.html?reg=us&type2=-1&prod=dcp7040_us_as&c=us&lang=en&flang=all

You have a bad toner cartridge or a poorly remanufactured toner cartridge. This condition called "false toner low". get original one from authorized dealer
good luck,
rate the solution

go to this link and i am not sure but i think the one at the top of the page might help you out.. toner cartridge for the MFC 7820n printer It still says the toner life is...

Vamos abra a maquina, retira o cartucho, do lado esquerdo tem uma alavanca preta (do lado de dentro da maquina), empurra ela e segura, vai com uma chave de fenda e fecha o sensor de tampa aberta q se localiza do lado esquerdo da parte da frente da maquina, apos vc fechar o sensor a maquina ira fazer o auto teste, e vai mostra Toner erro, coloque o cartucho novamente, delique a maquina fecha a tampa e liga novamente.

It has no accurate measure of the toner left, it is reset when you put in a fresh toner and just counts prints. The Brother shines a light thru a little window from right to left and when the toner is empty the light shines thru and it says it's empty.

You have a bad toner cartridge or a poorly remanufactured toner cartridge. This condition called "false toner low".

When the Toner Life End LED flips on, requires you to replace the cartridge, even when there's still toner left in the cartridge. The machine detects end of life by shining a light through from one side to the other.
To circumvent the detection mechanism, remove the cartridge and put a piece of masking tape over or jam a little bit of paper into the clear opening/circle on the right side of the toner cartridge, and then pop the cartridge back in. Eventually, you'll start seeing streaks, and then you'll know that the cartridge is truly empty.

unplug plug it back in, did you remove the protective cover and clean coria wire?
http://welcome.solutions.brother.com/BSC/public/us/us/en/faq/faq/000000/000000/000065/faq000065_018.html?reg=us&c=us&lang=en&prod=dcp7020_us