How to check the toner level of Brother printer

Before refilling, clean entire cartridge units. Remote its cleaning blade and clean it with an IP solutions and make sure no bends in cleaning blade. Do not mix new toner powder with old one. Also clean plastic portion below the developer roller also. Then the same complaint found, clean the LSU unit of the machine. Now it work properly.

The drum is the the part where the the toner is attached to it , I replace mine once a year, I use it a lot, to reset the Drum Open the toner cover on the printer press Clear/back then press up /+ button good luck

With the computer off will the printer still make a copy? If the printer can still make a copy stand alone, then try deleteing the printer and reinstalling the printer driver.

Replace the toner with a new one.

someone cheaped out and got the el cheapo paper.
The low quality paper has paper dust on every page....
when the printer feeds this cheap paper thru the machine it drops the dust onto the tonor cartridge rollers and causes the roller to accumulate toner on the roller... this in turn is transfered to the pages being printed.
check your machines operation manual. There may be a clean cycle you can try to run to clean the rollers...
I had to buy a new toner cartridge for mine when this happened.

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

If your cartridge has a lever on the left side near the rear, it needs to be reset, and there's a lever inside on the left that can stick and cause that error. You need to wiggle and pull that lever until it moves freely again.

Yeah you can refill your cartridge. It is really easy and consists of removing the plug on the side of the cartridge, dumping out any old toner and dumping in the new toner. Its very easy. I have purchased refill kits from both of these sites in the past and its worked great:

www.tonerrefillstore.com

www.lasertekservices.com

They also have great customer service. I hope this helps!

by scrolling thru the menu u can click on toner save mode