How to reset toner for dcp 7030 and 7040 Brother laser printer

hello good afternoon, friend u can give a hint of how I resouvo the problem of drum printer oki 431dn + b, pending

Open the top. Pull on the top of the toner cartridge (don't release the latch, just pull it up). It will come up with the toner drum assembly attached. You will probably see another paper stuck there which can't be seen when the drums are installed. Also, open the back door and look for paper that might be stuck. But usually, when you've checked everywhere else, the remaining paper is flat under the toner drums. Once you get it out, just click the drum/toner assemblies back in place (careful not to let the green drum touch anything while it's out of the printer.

Buy a pack of 10 x .062A (1/16A) pico fuse RS part No 738-3062. Switch off printer. Remove the drum and toner together from the drum slot to be reset. Carefully crimp the legs of the fuse around the contact wires on the right side of the drum slot. Make sure fuse legs are making a good connection to the wires and aren't touching the frame. switch on printer and allow it to detect the absence of the drum. Switch off printer and carefully remove the now blown fuse. Re-install the toner and drum assemnbly. Drum life is now reset. see pic:

try this:

1.Press Menu = printer displays "Paper Menu"
2.Press Next 4x = printer displays "System Menu"
3.Press Select 1x = printer displays "Factory Defaults"
4.Press Next 7x = printer displays "Reset Toner Life"
5.Press Select 1x = printer displays "Resetting Toner Page Count"
6.Press Ready

It usually resets automatically when you replace the drum/toner units. Are you trying to get it to reset before it's supposed to? I don't know of any way you can do that.