You need to remove the inks and lift out the printhead, check the bottom for any paper scraps, wipe gently on a damp paper towel. If after cleaning you still get partial blue, you will need a new printhead. The part number is stamped on the side of the printhead. Sometimes paper lint and scraps stick to the bottom of the printhead.
SOURCE: The auto print head alignment
It sounds like your black (K) or Black/Yellow (KY) head needs to be replaced.
The problem appears to be in the top half of the black head.
Without knowing more (like what make/model the printer is) I can't help more than that.
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