Causes of Lines on the Page from a Laser Printer

Laser printers can provide your company with years of trouble-free output, ranging from modest desktop units to workgroup-class machines. Before assuming the worst, start your troubleshooting with the simplest alternatives when your dependable technology starts printing pages with vertical or horizontal lines that aren’t related to the material you printed. By comparing the symptoms you observe with the potential causes, you can identify the origin of these problems.

Roller Tracks

The rollers that transport paper through your printer might become contaminated when stray toner spills out of a cartridge and into the mechanical assembly of the device. The location of the rollers in relation to the paper-feed path corresponds with the “tire-tracks” pattern that is created by this contamination. It appears at the edges or in the centre of a sheet. Leave this cleanup task to professionals unless you are a printer technician, especially if your hardware is still covered by warranty. To rule out faulty supplies as the culprit, replace your toner cartridge (or cartridges in a colour printer) before you call for assistance.

Vertical Streaks or Lines

Black or white vertical faults, such as printed marks or voids in the printing, could indicate a toner cartridge that is almost empty, has a scratched drum, or has toner that is not evenly distributed. You can eliminate the cartridge as the problem by exchanging it for another one. Additionally, vertical white lines may indicate an obstacle that inhibits the laser from accurately capturing pages. Cleaning certain components of the laser system or replacing it entirely may be necessary to fix the issue.

Horizontal Lines

Contaminated rollers can cause horizontal printing flaws and markings that recur repeatedly. The layout and size of the rollers, cartridge components, fuser parts, and other potential sources of non-random markings can be correlated with the location of the faults on the page using the model-specific repeated defect rulers that manufacturers provide. The same issues that result in vertical errors, such as laser contamination and toner cartridge issues, can also result in dropouts and non-repeating marks.


On laser printers, toner cartridges are the main components that may be changed. Their drums are harmed by light, which also lowers the quality of their prints. Additionally, contaminants added through the paper supply may cause scratches that obstruct accurate imaging. Since print errors can occur at any time, having extra cartridges on hand allows you to resume work right away if your consumables turn out to be defective. Many additional potential sources of lines and streaks in your output, especially lasers and fusers, can endanger the safety of the well-meaning but inexperienced user. Put down the tools and get a pro if you are unsure of what you are doing underneath the lid.

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