My printer only prints blank pages?!?

it is a brother printer and i never had a problem until now! i did notice lately the printing quality was kinda blurry. the black ink is full but the colours are pretty much empty. i put black tape on them months ago to make the sensors think they were full so i could print black and white documents. what should i... show more it is a brother printer and i never had a problem until now! i did notice lately the printing quality was kinda blurry. the black ink is full but the colours are pretty much empty. i put black tape on them months ago to make the sensors think they were full so i could print black and white documents. what should i do now? buy all the colour cartridges which i dont need or get a new printer?
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