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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On some printer models, you can upgrade the contents of these ROM chips the firmware by performing a process called flashing the ROM. Many of these sensors are really tiny switches that detect open doors and so on. As a general rule, you should obtain the highest quality scan you can manage, and then play with the size and image quality when it’s time to print it or share it over the Web. Most printers have one faster speed for monochrome printing that is, using only black ink and another for full-color printing.

Finally, a static charge eliminator removes the paper’s positive charge see Figure Exposing A laser is used to create a positive image on the surface of the drum. 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.

It used to be that you would physically connect the printer to a single computer and then share the printer on the network.

Any particle on the drum struck by the laser becomes conductive and its charge is drained away into the grounded core of the drum. It uses a roll of heat-sensitive plastic film embedded with page-sized sections of cyan bluemagenta redand yellow dye; many also have a section of black dye. Unlike PostScript, however, PCL is not a true page description language; it uses a series of commands to define the characters on the page. You can and will adjust the first three during the scanning process, although probably only down from their maximum.

More and more homes and home offices are enjoying the benefits of network printing. I recommend fomptia least x dpi optical resolution or better, although you can get by with a lower resolution for purely Web-destined images.

Now we turn to the physical side of the printing process.

Want to learn a language? Printer manufacturers began to separate the ink colors into three separate cartridges so that printers came with four cartridges: You place a photo or other object face down on the glass called the platenclose the lid, and then.


Back in the s, the multifunction device Gdiialso known as the multifunction printer MFPtried to consolidate multiple functions often printing and scanning into a single device. To reduce maintenance costs, however, many other laser printer parts, especially those that suffer the most wear and tear, have been incorporated into the toner cartridge. Developing Those particles with a lesser negative charge are positively charged relative to the toner particles and attract them, creating a developed image see Figure 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.

System Board Every laser printer contains at least one electronic board. Because a laser printer has to paint the entire surface of the photosensitive drum before it can begin to transfer the image to paper, it processes the image one page at a time.

The toner is merely resting on top of the paper after the static charge eliminator gddi removed the paper’s static charge. This is another mechanical function with a dedicated duplexing assembly for reversing the paper. A printhead containing thousands of heating elements, capable of precise temperature control, moves across the film, fomptia the dyes and causing them to soak into specially coated paper underneath before cooling and reverting to a solid form.

Smaller, specialized printers called snapshot printers use dye-sublimation specifically for printing photos at a reduced cost compared to their full-sized counterparts.

As you might imagine, the higher resolution images capture more fine detail.

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

Erase Lamp The erase lamp exposes the entire surface of the photosensitive drum to light, making the photosensitive coating conductive. Following are the more common printer languages.

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: Your software must use the proper language when communicating with your printer, in order to output paper documents. Printer Languages Now that you’ve learned about the different types of print devices and techniques, it’s time gci take a look at how they communicate with the computer.

Fire up your browser and head over to the Web site for Hewlett-Packard www. Impact printers transfer data to the printer one character or one line at a time, whereas laser printers transfer entire gddi at a time to the printer. The comptla common color depth options you will run across in scanners today are bit and bit.


Some computers are even used exclusively for the purpose of producing paper documents. The scanning and printing capabilities of a multifunction device enable manufacturers to add copy-machine features easily.

Learn domptia this text and thousands like it on LingQ. It is also quite fragile-usually finer than a human hair. Printers No other piece of your computer system is available in a wider range of styles, configurations, and feature sets than a printer, or at such a wide price variation.

When particles are struck by the laser, they are discharged and left with a volt negative charge. The scanning software that controls the hardware can manifest in a variety of ways.

A laser printer uses a chip called the raster image processor RIP to translate the raster image into commands to the laser. Adjust your scanning settings to optimize for your project. To hear audio for this text, and to learn the vocabulary sign up for a free LingQ account.

The scan speed relates to all four of the other variables, and the maximum speed is hard-coded into the scanner. You’ll need to know how to support networked connections as gsi as the plug-and-play USB ones. It uses a device the laser imaging unit to “paint” a raster image on the photosensitive drum.

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

Common resolutions are x dpi or x dpi. Some lower-cost printers use LED arrays instead. Typically, printers using more ink cartridges produce higher quality printed images and cost more. Many dot-matrix printers use continuous-feed paper with holes gfi its sides that are engaged by metal sprockets to pull the paper through this is known as tractor-feed paper because the sprockets are reminiscent of the wheels on a tractor.

The RIP takes the digital information about fonts and graphics and converts it to a rasterized image made up of dots that can then be printed. To counter this problem, most laser printers have a special ozone filter that needs to be vacuumed or replaced periodically.