Cartridge Black Letter

Cartridge Black Letter
What is wrong with the printer?

I have a Brother DCP-135C and only recently has been playing up. When I try to print something that has black in it, black seems to have a cast to it and there is no gap as a kind of weak on the charts on the right in a row in the center of all letters are in black. I have tried to Al, the alignment and I have tried new Ink Cartridges and none of them work. I tried to print material in different colors and works well. I tried cleaning the printer with the option that lets you do it from the front of the printer. I have tried to clean the tube with a needle behind the Ink Cartridge in the printer, but even this does not help. I've had enough now and I do not know what to do, as you guessed from the warranty also. Any help?

It appears that the nozzle is blocked. Have you tried to clean it in the maintenance of the printer settings?