As the paper passes the drum, the paper's negative charge attracts toner from the positively charged drum the toner literally sits on top of the paper.Paper entering the printer receives a negative charge.The toner sticks to the negatively charged image on the drum. Then the drum picks up the positively charged toner from the toner cartridge.The laser beam bounces off a mirror onto the drum, drawing the image on the drum by burning a negative charge in the shape of the image.The system's electronics convert the image into a laser beam.The revolving drum gets a positive charge.
A photo, graphic or text image is sent to the printer, which begins the process of transferring that image to paper using a combination of positive and negative static electric charges. The following steps detail how a laser printer works: Many have user-friendly touchscreen displays. Typically, laser printers are used for printing whereas newer all-in-one printers can function as a printer, copier, scanner and fax. Laser printers can handle both black and white and color printing, though color laser printers are more expensive than monochrome laser printers. Wi-Fi is also used to connect mobile devices to printers for mobile printing. In a home office or small business, a cable or Wi-Fi are used to connect the printer to computing devices. Office connectivity is typically via an Ethernet connection. Laser printers can be used in a home office or a small business office. They usually have MFP or MFC for multifunction center as part of their model numbers. These devices are known as multifunction printers (MFP). In some cases, a laser printer is used as a multifunction peripheral with printing, scanning, photocopying and fax capabilities. Laser printers are still often connected directly to a single PC, but today many are linked to local area networks ( LAN), supporting workgroups or entire departments. It typically replaced an impact dot matrix printer or a non-impact inkjet printer. 
The laser printer was popularized in the mid-1980s as a standalone printer for use with personal computers. The toner is transferred onto a piece of paper and fused to the paper with heat and pressure. The drum is then rolled in toner, a dry powder type of ink that adheres to the charged image on the drum. When a document is sent to the printer, a laser beam "draws" the document on a selenium-coated drum using electrical charges. A laser printer is a popular type of computer printer that uses a non-impact photocopier technology where there are no keys striking the paper.
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