Assuming you are using brother genuine toner, the next thing I would look at is the Drum cartridge. The drum is the part of the cartidge when removing the toner.you should see a blue tab on the drum, Try moving the blue tab side to side a few times to clean the charge wire.
If that clears it up or improves the quilty of the prints than you probably have a bad toner. If it doesn't get any better then you probably are going to need to replace the fuser.
It is probably the toner cartridge, not the drum. I suggest swapping in old toner cartridges and drums to nail down the problem. I keep at least one old toner and one old drum for that purpose. By the way I just bought a toner cart from monoprice.com. It will not last as long as a Brother cart, but costs very little.
SOURCE: MFC440CN PRINTING - ALL BLACK
I understand that the machine is printing only in BK. You have lost color.
If so, do run the cleaning cycles several times and run quality check test prints after each cycle.
There should be color again.
Otherwise the ph is defective!
SOURCE: Only black prints
It will only get worse. Do a google search and you will find out the print head is defective. After a multitude of complains, Brother has a more reliable print head for a fix. I'm not fixing mine. I've already invested too much in ink because of the auto cleaning it is programmed to perform.
A built in print head vs. a printer that has the ink tank and print head combined sounds like a good idea. The ink tanks are cheaper because they don't have the electronics built in and you only replace one color at a time. The problem is the print head clogs after several ink tanks have gone through them. Now, instead of paying $40 for a new ink cartridge with built in print head, you are paying for the ink that is wasted by all the required automatic cleanings, and eventually taking the printer to the repair shop for a new print head (parts and labor average $150) that may fail at any time.
My advice is to avoid any further headaches and buy a HP. Don't rely on good reviews, Consumer Reports rated this model a best buy.
SOURCE: My Brother Printer (model MFC-290c) and ink
On your printer take a look on the "ink management button"press it then look for cleaning using the arrows up and down then press ok or set or what ever the command the printer will display just try to perform head cleaning.try for several times lets say 4x don't clean too much it might ruin all other color if it has no changes try to bring it to a service center,they can soak it to a chemical solution,the head is clog.
SOURCE: Printer prints 3 large ink blotches on long side
you may insist to clean the drum part. Your problem is in that area. Or try to change the drum unit with another one from the other printer if you have one. You can use an vacuum cleaner to absorb the toner inside the corona part. You should be careful at the corona wire.
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