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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What a printer gddi and can’t do is largely determined by the type of printer technology it uses that is, how. When particles are struck by the laser, they are discharged and left with a. Most folks cokptia the term resolution to define the grid size. Many retail businesses still use it as a receipt printer, using large rolls of thermal paper gdo 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.

Pick a particular printer technology and check the price, from the cheapest to the most expensive. You place a photo or other object face down on the glass called the platenclose the lid, and then.

The dye-sublimation printing technique is an example of the so-called CMYK cyan, magenta, yellow, black method of color printing. If your color cartridge ran out of one of the colors,you had to purchase a whole new color cartridge or deal with a messy comptiaa kit.

This is another mechanical function with a dedicated duplexing assembly for reversing the paper. Printers that create an image on paper by physically striking an ink ribbon against the paper’s surface are known as impact printers. Laser printers rely on the photoconductive properties of certain organic compounds.

Cleaning The printing process ends with the physical and electrical cleaning of the photosensitive drum see Figure Today you can find color inkjet printers with six, eight, or more color cartridges. Resolution is measured in dots per inch dpi ; higher numbers mean that the ink dots on the page are closer together, so your printed documents will look better.

When particles are struck by the laser, they are discharged and left with a volt negative charge.

Configurable Variables Scanners convert the scanned image into a grid of pixels often referred to as dots. The ink is ejected through tiny tubes. On comptla printer models, you can upgrade the contents of these ROM chips the comptix by performing a process called flashing the ROM. Most gearboxes also have their own motor or solenoid to move the gears. Before printing another new page, the drum must be returned to a clean, fresh condition.


Printer manufacturers began to separate the ink colors into three separate cartridges so that printers comptis with four cartridges: The scanner runs a bright light along the length of the platen once or more to capture the image.

If you get a memory overflow error, try reducing the resolution, printing smaller graphics, or.

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

You put a document in the feeder, plug in the fax number, and press the Send button or whatever the manufacturer labels it. Your software must use the proper language when communicating with your printer, in order to output paper documents. These printers are fast, too! PostScript interpreters are embedded in the printing device. The two key features of an inkjet printer are the print resolution-how densely the printer lays down ink on the page and the print speed.

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

Another feature of inkjet printers is that they can support a staggering array of print media. Once the printer receives some or all of a print job, the hardware of the printer takes over and processes the image.

Even if a printer does not come with built-in Ethernet, Wi-Fi, or Bluetooth, you can purchase a standalone network device known as a print server to connect your printer to the network but beware that you may not be able to use all features of a multifunction device connected to a print server. Any particle on the drum struck by the laser becomes conductive and its charge is drained away into the grounded core of the drum.

Erase Lamp The erase lamp exposes the entire surface of the photosensitive drum to light, making the photosensitive coating conductive. Two rollers-a heated roller coated in a nonstick material and a pressure roller melt the toner to the paper, permanently affixing it.

These five companies make most of the printers on the market today. Just be sure to unlock before you try to use it or you’ll get a light that’s stuck in one position. Next, Windows sends the first print job to the printer.


Although most printer companies will happily sell you their expensive RAM, most printers can use generic DRAM like the kind you use in a computer. An inkjet printer also has a RIP, but it’s part of the software driver instead of onboard hardware circuitry.

Most models send each page through four different passes,adding one color at each pass to create the needed results,while others place compgia the colors onto a special transfer belt and then transfer them to the page in one pass. All of these mechanical features can wear out or compria and require service or replacement. Although this makes replacement of individual parts nearly impossible, it greatly reduces the need for replacement; those parts that are most likely to comptiia are replaced every time you replace the toner cartridge.

It uses a device the laser imaging unit to “paint” a raster image on the photosensitive drum. In this section, you’ll look at how scanners work and then turn comptiq what you need to know to select the correct scanner for you or your clients. Cloud and Remote Printing Blurring the line between traditional and virtual printing, a variety of applications, such as Google Cloud Print, will install a virtual printer on your system that wraps up your document and sends it out over the Internet or other network to a cloud server, which eventually ends up routing it to a real printer for printing all without needing to have a driver installed for it.

Then look for printers that have the same resolution but different ppm rates. It uses a roll of heat-sensitive plastic film embedded with page-sized sections of cyan bluemagenta redand yellow comptiaa many also have a section of black dye. This not only was more cost-effective for the user, but it also resulted in higher quality printouts.

Of particular importance is the printer’s RAM. The entire surface coptia the drum has a uniform negative charge of between and volts following its charging by the primary corona wire or charge roller. Although you can use an external printer language such as PostScript, most users simply install printer drivers and let Windows do all the work.