Repairing a printer cartridge

These use the TN-630/660 and DR-630- it's basically cloned to death and the 3rd party toner is mature, so you can get a clone and save a lot of money, even for the drums (though I do not like 3rd party Brother drums and avoid them unless the machine is worth more dead or it is discontinued -- and if the drum is discontinued, the toner always follows with Brother). Now Brother does split the drum and toner, so if it continues with a repair (see below) and a replacement toner, you will need an imaging drum.

A lot of the time it's clumpy buildup on the transfer roller and in some cases cleaning the corona wire helps, but not always. If it does not help, the drum itself is bad. Sometimes if you can open it without making a mess, you can sometimes revive it but 8/10 times on Brother toner it is low and needs a refill/replacement, or the toner has a distribution issue where it needs to be rebuilt and the part you need is not available without a donor toner. Brothers have a system where they recycle the toner back into the cartridge as they do not store waste toner in the imaging drum, so they have a mechanism which recycles it back into the toner. If the toner feels "full" but you have problems with the print quality a lot of the time it's usually running on regurgitated toner that is dead.