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chap22 - All-In-One CompTIA Network All-in-One Exam Guide...

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CHAPTER 22 973 Printers In this chapter, you will learn how to • Describe current printer technologies • Explain the laser printing process • Install a printer on a Windows PC • Recognize and fix basic printer problems Despite all of the talk about the “paperless office,” printers continue to be a vital part of the typical office. In many cases, PCs are used exclusively for the purpose of producing paper documents. Many people simply prefer dealing with a hard copy. Programmers cater to this preference by using metaphors such as page , workbook , and binder in their applications. The CompTIA A+ certification strongly stresses the area of printing and expects a high degree of technical knowledge of the function, components, mainte- nance, and repair of all types of printers. Essentials Printer Technologies No other piece of your computer system is available in a wider range of styles, configu- rations, and feature sets than a printer, or at such a wide price variation. What a printer can and can’t do is largely determined by the type of printer technology it uses—that is, how it gets the image onto the paper. Modern printers can be categorized into several broad types: impact, inkjet, dye-sublimation, thermal, laser, and solid ink. Impact Printers Printers that create an image on paper by physically striking an ink ribbon against the paper’s surface are known as impact printers . Although daisy-wheel printers (essentially an electric typewriter attached to the PC instead of directly to a keyboard) have largely dis- appeared, their cousins, dot-matrix printers , still soldier on in many offices. Although dot- matrix printers don’t deliver what most home users want—high-quality and flexibility at a low cost—they’re still widely found in businesses for two reasons: dot-matrix printers
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CompTIA A+Certification All-in-One Exam Guide 974 have a large installed base in businesses, and they can be used for multipart forms be- cause they actually strike the paper. Impact printers tend to be relatively slow and noisy, but when speed, flexibility, and print quality are not critical, they provide acceptable results. PCs used for printing multipart forms, such as point of sale ( POS ) machines that need to print receipts in duplicate, triplicate, or more, represent the major market for new impact printers, although many older dot-matrix printers remain in use. Dot-matrix printers use a grid, or matrix, of tiny pins, also known as printwires , to strike an inked printer ribbon and produce images on paper (Figure 22-1). The case that holds the printwires is called a printhead . Using either 9 or 24 pins, dot-matrix printers treat each page as a picture broken up into a dot-based raster image. The 9-pin dot-matrix printers are generically called draft quality , while the 24-pin printers are known as letter quality or near-letter quality ( NLQ ). The BIOS for the printer (either built into the printer or a printer driver) interprets the raster image in the same way a monitor does, “painting” the image as individual dots. Naturally, the more pins, the
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  • Spring '10
  • n/a
  • Inkjet printer, Laser printer, Computer printers, All-in-One Exam Guide, CompTIA Network+ All-in-One, Meyers & Jernigan

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