A user reports that documents from a laser printer have vertical lines covering the length of the page where nothing is printed. The user replaces the toner cartridge, but the problem persists. Which

An outdated print driver typically causes software-related issues such as formatting errors, incorrect settings, or communication failures, not specific physical print defects like consistent vertical blank lines.

An overheated fuser unit would more commonly lead to issues like toner smudging, incomplete fusing, or paper jams, rather than distinct, unprinted vertical lines on the page.

Since the problem persists after the toner cartridge was replaced, it indicates that the original cartridge was not defective, or the new one is also defective (which is unlikely), making the problem lie elsewhere in the printer, such as with a separate corona wire.

A dirty or contaminated corona wire (or primary charge roller) prevents the even application of an electrostatic charge to the photosensitive drum. This leads to areas on the drum not attracting toner, resulting in vertical blank or unprinted lines on the printed page.