Which component of a laser printer is responsible for attaching the toner to the paper and making the print job permanent?
1. >>Fuser assembly
2. Photosensitive drum
3. Transfer corona
4. Print head
Explanation : The fuser assembly is the part of the laser printer that performs the final step in creating a printed page. Prior to this point, the toner is attracted to the page because of a difference in electrical charges. However, the toner is not permanently attached. The fuser assembly heats the toner and the paper, melting the plastic in the toner. The roller in the fuser assembly then presses the toner onto the page, making the print job permanent (fusing the image to the paper).
The transfer corona (or transfer roller) is used to apply a positive charge to the paper so that the paper attracts the negatively charged toner.
The photosensitive drum is used to create the image that will be printed. It is first given a strong uniform negative charge (between -800 and -1200V). Next, the image is "written" to the drum using the laser beam, which changes the charge of the dots that should be written to a low negative charge (between -200 and -400V). The toner, which is given a higher negative charge than the dots (around -600V) are attracted to the areas where the dots are drawn, thus forming the image on the drum.
A print head is used on impact printers, such as dot-matrix printers and on inkjet printers. A laser printer does not have a print head.
Objective: Printers and Scanners
