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That actually sounds more like a paper issue that a mechanical issue. Check to see if there is some sort of glossy paper that has been loaded in, and check your printer settings to make sure that they are correct for the type of paper being used.
If that’s not it, the most likely cause is the printhead. I’m not sure about the specifics on that particular Deskjet, but there should be a printhead cleaning function that you can run. Check for it on the HP Solutions Center software that came with the printer and run the “Clean Print Cartridge” function.
Worst case scenario, you might need to get a new print cartridge.