Which component in a laser printer is responsible for applying toner to the drum?

The component responsible for applying toner to the drum in a laser printer is the developer roller. This roller plays a critical role in the printing process. After the laser printer creates an electrostatic image on the drum, the developer roller comes into contact with the toner. The developer roller is charged in such a way that it attracts the positively charged toner particles onto the areas of the drum where the laser has created a negative charge.

This process ensures that the toner adheres only to the parts of the drum that correspond to the intended print image. After the toner is applied, the drum then transfers the toner to the paper during the printing process, facilitated by the transfer belt. The fuser assembly is responsible for melting the toner onto the paper, while the drum unit is where the image is initially created, but it doesn’t apply the toner itself. Understanding the role of each component in the printer helps to appreciate how they work together to produce high-quality prints.