My printer left spots on the pages. I first replaced the toner but that didn't help. Apparently this problem is usually related to a drum problem. It was a bargain price and extremely easy installation. My print quality improved immediately and the smudges were gone. I've used multiple toner cartridges so I think it's related to the new drum. I have since learned that the drum should be replaced every few toners. I considered just buying a new printer but am very glad I went with the drum. Significantly cheaper and I don't have to go through all the settings again. It's also better for the earth than replacing the entire printer.
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