TestOut LabSim A+ Certification Practice Exam

Which component in a laser printer is responsible for charging the paper to attract toner?

1. Fuser Unit

2. Primary Corona

3. Secondary Corona

4. Transfer Belt

The correct answer is: Secondary Corona

The component responsible for charging the paper in a laser printer to attract toner is the secondary corona. The secondary corona wire or roller applies a positive charge to the paper, which is essential in the printing process. After the toner has been applied to the printed image on the photosensitive drum, the positively charged paper attracts the negatively charged toner particles. This process enables the toner to adhere to the paper effectively before it is transferred and fused onto the sheet. In addition to this, it’s important to understand the role of the primary corona and other components. The primary corona, for instance, charges the photosensitive drum to prepare it for toner application. The transfer belt is used to transfer the image from the drum to the paper, but it doesn't charge the paper itself. The fuser unit is involved later in the process by applying heat and pressure to permanently bond the toner to the paper. Understanding the distinct roles of these components clarifies why the secondary corona is critical for charging the paper specifically.