CompTIA A+ Certification Exam Objectives .. GDI graphics device interface. GHz gigahertz. GUI graphical user interface. GPS. The Windows GDI builds the page and then sends it to the printer. A less- sophisticated method of communicating to a printer is to use the GDI (Graphics Device. GDI is actually a Windows component and is not specific to printers. Instead, it’s a series of components that govern how images are presented to both monitors.

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More and more homes and home offices are enjoying the benefits of network printing. Just be sure to unlock before you try to use it or you’ll get a light that’s stuck in one cokptia.

CompTIA A+ Certification Exam Guide, A+ Chapter 27 Printers and Multifunction Devices (1)

If they did not, the PRT scR print screen key would not work with every printer. Photoconductive means that particles of these compounds, when exposed to light that’s the “photo” partwill conduct electricity.

This matters if you work with black-and-white images in any significant way, because grayscale depth may be advertised with a much lower number than color depth. Using the laser, we can “write” an image onto the drum. 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. When you push the front button on the Epson Perfection scanner in Figurefor example, the Epson software opens ready to start scanning.

Before printing another new page, the drum must be returned to a clean, fresh condition. See the “Troubleshooting Printers” section later in this chapter for more details. Cojptia take that ancient ImageWriter dot-matrix printer and network it-I dare you!

The most common color depth options you will run across in scanners today are bit and bit. Finally, a static charge eliminator removes the paper’s positive charge see Figure Scanners differ a lot in grayscale gddi, a number that defines how many shades of gray the scanner can save per pixel.


Now we turn to the physical side of the printing process. Take a look back at Gdo 20 and Laser printers usually use lasers as a light source because of their precision.

Other Connections Plenty of other connection types are available for printers. The entire surface of the drum has a uniform negative charge of between and volts following its charging by the primary corona wire or charge roller. That won’t make for very good scans! Although you can use an external printer language such as PostScript, most users simply install printer drivers and let Windows do all the work.

You can and will adjust the first three during the scanning process, although probably only down from their maximum.

If you get a memory overflow error, try reducing the resolution, printing smaller graphics, or. What a printer can and can’t do is largely determined by the type of printer technology it uses that is, how.

To hear audio for this text, and to learn the vocabulary sign up for a free LingQ account. The heat method printers use tiny resistors or electroconductive plates at the end of each tube that literally boil the ink; this creates a tiny air bubble that ejects a droplet of ink onto the paper, thus creating a portion of the image see Figure I recommend at least x dpi optical resolution or better, although you can get by with a lower resolution for purely Web-destined images.

The dye-sublimation printing technique is an example of the so-called CMYK cyan, magenta, yellow, black method of color printing. Postscript Adobe Systems developed the PostScript page description language in the early s as a device-independent printer language comptiaa of high-resolution graphics and scalable fonts.

By visiting the site, you agree to our cookie policy. Although daisy-wheel printers essentially an electric typewriter attached to the computer instead of directly to a keyboard have largely disappeared, their cousins, dot-matrix printers, still soldier on in many offices.


Common resolutions are x dpi or x dpi. It uses a device the laser imaging unit to “paint” a raster image on the photosensitive drum. Power Supplies All of the devices described in this chapter have power supplies, but when dealing with laser printers, techs should take extra caution. Pick a particular printer technology and check the price, from the cheapest to the most expensive. Many retail businesses still use it as a receipt printer, using large rolls of thermal paper housed in a feed assembly that automatically draws the paper past the heating element; some receipt printers can even cut the paper off the roll for you.

CompTIA A+ Certification Exam Guide, A+ Chapter 27 Print

Solid ink printers become a bit more affordable when you factor in the cost of consumables. Most gearboxes also gid their own motor or solenoid to move the gears. Modern printers can be categorized into several broad types: When light hits these particles, whatever electrical charge they may have “drains” out through the grounded cylinder.

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Dot-matrix printers use a grid, or matrix, of tiny pins, also known as print wires, to strike an inked printer ribbon and com;tia images on paper see Figure This not only was more cost-effective for the user, but it also resulted in higher quality printouts. A printhead containing thousands of heating elements, capable of precise temperature control, moves across the film, compyia the dyes and causing them to soak into specially coated paper underneath before cooling and reverting to a solid form.