A drum is like a camera, a photoconductor it’s what takes the picture. You could have a whole other problem if you have horizontal black lines on both copies and prints.īlack lines on copies and prints means there is an issue with the drum. The other scenario down below is a bit less ideal. On the bright side this one is the easiest fix, and least expensive since you usually don’t have to replace anything. If your laser printer is making horizontal black lines on copies but not prints, a good cleaning should help solve the problem.Įven the slightest speck of dust on the optics could cause defective prints, so it is important to keep equipment clean. There’s something interfering with the machine’s ability to get a clear view of the image. Usually that means there’s some sort of material on the glass where the scanning is being done.

If you’re getting black lines on copies and not on prints, then you know something is interfering with the optics. There could be two causes of this problem, and identifying the root cause couldn’t be more simple. If you’re consistently running into problems with your laser printer and horizontal black lines, the first thing you have to do is identify the root of the problem. Why is My Laser Printer Making Horizontal Black Lines? In the end, we’re sure you’ll find the problem is easier to fix than you might think. This article will teach you two different ways you can get to the root of the problem and get back to making clean copies. There are two reasons why your laser printer is causing horizontal black lines. Office equipment may have the occasional malfunction, but if your laser printer is causing horizontal black lines consistently then you have a greater problem on your hands. There’s no worse feeling than the satisfaction of finishing a print job, only to find out the pages have been ruined by horizontal black lines.

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