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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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Sensors and Switches Every laser printer has a large number of sensors and copmtia spread throughout the machine. When the primary corona or primary charge roller is charged with an extremely high voltage, an electric field or corona forms, enabling voltage to pass to the drum gsi charge the photosensitive particles on its surface.

Better scanners give you the option of copying directly from a photographic negative or slide, providing images of stunning visual quality assuming the original photo was halfway decent, of course! You can use a scanner to make digital copies of existing paper photos, documents, drawings, and more. You can get these through official Adobe software, but there are also some third-party options. Solid Ink Printers Solid comtia printers use just what you’d expect solid inks.

First, the paper must be grabbed by the pickup clmptia and passed over the separation pad, which uses friction to separate a single sheet from any others that were picked up. Toner The toner in a laser printer is a fine powder made up of plastic particles bonded to pigment particles.

The enhanced resolution numbers are useless. Scanning Speed Scanners have a maximum scanning speed defined by the manufacturer. Fire up your browser and head over to the Web site for Hewlett-Packard www.

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

Toner Cartridge The toner cartridge in cmptia laser printer is so named because of its most obvious activity: Older inkjet printers had two cartridges: The scanning software that controls the hardware can manifest in a variety of ways. As you might imagine, the higher resolution images capture more fine detail. 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.


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

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

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. The corona in a laser printer requires extremely high voltage from the power supply, making a laser printer power supply one of the most dangerous devices in computing! How Scanners Work All flatbed scanners, the most common variety of scanner, work the same way.

The toner must be melted to the paper to make the image permanent. Laser Printers Using a process called electrophotographic imaging, laser printers produce high-quality and high-speed output of coptia text and graphics. At first these devices weren’t terribly great at any of their functions, but today’s mature multifunction devices are more common than their single-function counterparts.

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. Common resolutions are x dpi or x dpi. Once the printer icon goes away, you know the print queue is empty all jobs have gone to the printer.

Although not 3 harmful to humans in small amounts, even tiny concentrations of ozone will cause damage problem to printer components.

The heated roller has a nonstick coating such asTeflon to prevent the toner from sticking to it. Power Supplies All of the devices described in this chapter have power supplies, but when dealing with laser printers, techs should take extra caution.

As in most such software, you choose File I Create and then select Scanner. How do you tell a printer to make a letter A or to print a picture of your pet iguana? Dye-sublimation printers produce high-quality color output that rivals professional photo-lab processing. The chapter continues with the steps for installing a multifunction device in a typical personal computer, and concludes with troubleshooting issues.

Many people simply still prefer dealing with a hard copy, even as portable devices have proliferated.


As in most such software, you choose File I Create and then select. Raster Images Impact printers transfer data to the printer one character or one line at a time, whereas laser printers transfer entire pages at a time to the printer.

The first is the direct thermal. Here you can set the resolution of the image as well as many other options. Other Connections Plenty of other connection types are available for printers. It used to be that you would physically connect the printer to a single computer and then share the printer on the network.

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 Using an inkjet printer, you can print on a variety of matte or glossy photo papers, iron-on transfers, and other gdj media; some printers can print directly onto specially coated optical discs, or even fabric.

Today, the typical fdi printer comes with its own built-in Wi-Fi adapter to enable wireless printing over infrastructure or ad hoc network connections, though you should. The drum itself is grounded to the power supply, but the coating is not. Most inkjet printers use heat to move the ink, while a few use a mechanical method.

Xerox’s base model starts at about twice comptiia cost of a laser printer, with the expensive model selling for about six times the cost!

Most gearboxes also have their own motor or solenoid to move the gears. This is another mechanical function with a dedicated duplexing assembly for reversing the paper.

Most models send each page through four different passes,adding one color at each pass to create the needed results,while others place all the colors onto a special transfer belt and then transfer them to the page in one pass. The printing process ends with the physical and electrical cleaning of the photosensitive drum see Figure