Ron,
On these HP's the cartridge mounts to the print head and it moves back and forth across the page as it prints. The 722 I have has the head mounted on a rod about 3/8" diameter that it slides on. Try removing all the covers you can and give everything you can get to a good cleaning. It may need it after 5 years and may solve your problems.
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Take Smoke's advice as fact if it works and fiction if it don't!!!
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