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Some printers only use the black ink to provide a darker black. They also use the other colors to print black. That is they use all three to come up with black. If you color cartridge is out of two of the colors, you may be getting just the red. Otherwise you may have a hardware problem.
One or more of the drums may be defective. Swap the black with another color and print a document. If that color printed the charectors ok, then continue the test with the other drums each taking a turn in the Black drum position until you find the bad drum.