Anonymous posted an answer for this Office Equipment & Supplies:
"The Laser Scanner Unit or LSU is what writes to the surface of the drum. The glass above..."
Anonymous posted an answer for this Dell 1720dn Laser Printer:
"It can be a bad chip on the toner cartridge. It can also be a drum that is way beyond it's..."
Anonymous posted an answer for this Dell 1815dn All-In-One Laser Printer:
"Do you get the same line when you use the adf for other purposes? If so, check the scanner..."