Sounds like the print head is at fault. The print head is actually a vertical line of small wires that move in and out to form the dots as the head moves across the page printing one row of characters at a time. One of the wires has failed. While it is possible that cleaning the print head with contact cleaner will resolve the problem, it might be time to replace the print head, or likely buy a used working replacement printer at less money than the cost to repair.
More then likely someone has enabled "Strike through mode"
Are you using Word?
Don
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replace the printhead. no tools needed
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