Điều quan trọng cần lưu ý rằng hai giao thức có thể được sử dụng với nhau để tạo ra một chiếc xe buýt nhanh và Wide SCSI. SCSI-2 cũng tăng số lượng các thiết bị có thể được hỗ trợ trên xe buýt đến 16. SCSI-2 cũng tương thích ngược với các thiết bị SCSI-1 | printer from a laser printer. The difference boils down to the fact that an LED printer uses an array of about 2 500 light-emitting diodes instead of a laser to produce an electrostatic charge. An LED printer with a 600 dpi resolution has 600 LEDs per inch. Inside the laser printer Laser printers use toner to create the image on the printed page. Toner is a dry powder that consists of iron particles coated with a plastic resin that bonds to the paper during the print process. Toner is supplied to the printer in a removable cartridge that also contains many of the most important parts used in the printing process. The toner cartridge contains the photosensitive drum a mechanism used to place a charge on the drum a roller to develop the final image on the page and of course the toner. Plan on understanding just about everything there is to know about laser printers for the test including the following list of major components. Expect questions about the overall laser printing process as well as the role played by key components. In addition to the toner cartridge eight standard assemblies exist in a laser printer. These assemblies are The drum The drum inside the toner cartridge is photosensitive which means it reacts to light. The drum holds an electrostatic charge except where it is exposed to light . The laser beam is reflected onto the surface of the drum to create a pattern of charged and not-so-charged spots representing the image of the page to be printed. High-voltage power supply The EP process uses very high voltage to charge the drum and transfer and hold the toner on the paper. The high-voltage power supply converts AC current into the higher voltages used by the printer. DC power supply Like a computer most of the electronic components in the laser printer use direct current. For example logic circuits use -5V DC volts direct current and the paper transport motors use 24V DC. Also like the computer s power supply the laser printer DC power supply also .
