Epson Workforce 645 Printer Won't Print in Black

I gave my parents an Epson Workforce 645 printer and my Mom uses it to print a lot of travel-related documents (e-mails from travel agents, upcoming deals on cruises, etc.) to show my 85-year-old Dad who doesn't know (or have the patience to learn) how to use a computer.

Long story short, a few months ago, the aforementioned printer stopped printing my Mom's e-mails and web-based documents in black ink. The web pages and e-mails do print altogether, but the text is coming out a strange green/blue color, where the text used to be black. Also, the pictures and other color items don't appear to be effected - just the text.

Has anyone else had this problem and if so, have you found a solution? I tried something that worked about a month ago (but I don't remember what I did now) that fixed it when I was at their house; the problem has since reappeared, so I'm looking for a long-term fix without having to buy them a brand new printer. Also, all of the ink levels - especially the extra large capacity black ink - are perfect and full.

Thank you for your time and I appreciate any feedback you are able to offer!

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Have you tried cleaning the print heads?

How to do is in the Epson software.

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Epson admits it has not entirely black print mode.

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