In a laser printer, which of the following components uses heat to apply the toner onto the page?

The fuser assembly consists of a heated roller and a pressure roller that the paper passes through after toner has been electrostatically transferred onto it. The heat melts the thermoplastic toner particles and the pressure bonds them permanently into the paper fibers. This is why freshly laser-printed pages feel warm immediately after printing.

The pickup roller feeds paper sheets from the input tray into the paper path and has no role in toner application.

The transfer roller uses electrostatic charge to move toner from the imaging drum onto the paper but does not use heat.

The imaging drum holds a latent electrostatic image that attracts toner particles but does not apply heat to bond toner to paper.