Hi John,My name is***** will try my best to help you with your question.
When making copies, a mixture of colored inks is used to create the black color.
When you try printing on black only, the black ink is used instead, so it appears there is a blockage somewhere within the ink jet system. You can try running several cleans; if that does not work then a more thorough manual cleaning will be required.
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If several cleans still did not help, then there may be a problem with the ink cartridge - have you tried fitting another cartridge?
Yes using clean air to try and clean out any old dry ink is recommended.
Ok, if you need anything else just let me know at any time!