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It doesn't take much to trigger one of the sensors in this machine. I would give a thorough check to the paper path with a bright light. Then, to the best of your ability, take a piece of card stock or something similar and force it through the paper path in the normal direction of the paper (careful not to pull it backwards). Once that's done, blow it out with air.
If this doesn't help, then it may be a damaged sensor in the paper path that needs to be replaced.