same here and it is so frustrating. Was working fine all weekend, too. now, even though my toner carts are all at least 1/2 full, I'm out of luck.
From what I've seen, a lot of the troubleshooting steps suggest an issue with the toner, but for all 4 of them to all develop this problem? doesn't seem likely, and I would hate to spend money on new toner only to find it is a different problem.
something strange I've noticed. I'm using the latest MacOS, and I've been trying to print PDFs using the Preview app. There, I get these random horizontal lines. But, printing form other programs, such as Safari or Apple's Pages, things print fine.
So, @mike4311 - maybe check to see if you get different behavior from different applications? Very strange
We would be happy to assist with the issue. To provide some feedback or some troubleshooting steps, we would need some additional information. If you could reply to this message with the information below, we can provide some assistance. For a more immediate resolution, you can contact our support team at 1-800-652-2666. Our agents would be happy to assist.
I eventually got things working again. At first, I thought these lines were introduced by the PDF reader program, but that turned out not to be the case. It would randomly print fine, then randomly have the lines. What eventually got things going was cleaning the fixing assembly a few times. It took a few repeated tries to get it to work, but now things print fine. this Youtube video shows the process (and provides a lot of other tips for cleaning this printer)