What Is a Laser Jet Printer Self-Test?. Laser jet printers are made up of many sensitive parts including the photoreceptor, the drum assembly and the printer controller.

Since we are looking at a mono Laser printer we will only be using two of the three tests. Those of you who would like to test out your current printers can go here to download the test patterns.

A subtle background pattern generated by color laser printers helps authorities track counterfeit money or other documents back to the printer--and to the person who pressed the Print button.