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My 722C did that a few years ago. IIRC, it was either an uninstall and reinstall or a new black cartridge that fixed the problem (may want to try reseating the existing black cartridge first). Has it been idle for a period of time? That is one champion of a printer. I'd hate to see it put out to pasture. Mine is still in the closet because I refuse to let go of it.
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