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Using a process called electro-photographic imaging, laser printers produce high-quality and high-speed output of both text and graphics Figure 178 shows a typical laser printer Laser printers rely on the photoconductive properties of certain organic compounds Photoconductive means that particles of these compounds, when exposed to light (that s the photo part), will conduct electricity Laser printers usually use lasers as a light source because of their precision Some lower-cost printers use LED arrays instead
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Figure 178
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Typical laser printer
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17: Understanding Printing
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Some printers use consumables such as ink at a much faster rate than others, prompting the industry to rank printers in terms of their cost per page Using an inexpensive printer (laser or inkjet) costs around 4 cents per page, while an expensive printer can cost more than 20 cents per page a huge difference if you do any volume of printing This hidden cost is particularly pernicious in the sub-US$100 inkjet printers on the market Their low prices often entice buyers, who then discover that the cost of consumables is outrageous these days, a single set of color and black inkjet cartridges can cost as much as the printer itself, if not more!
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The first laser printers created only monochrome images Today, you can also buy a color laser printer, although the vast majority of laser printers produced today are still monochrome Although a color laser printer can produce complex full-color images such as photographs, they really shine for printing what s known as spot color for example, eye-catching headings, lines, charts, or other graphical elements that dress up an otherwise plain printed presentation
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Critical Components of the Laser Printer
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The CompTIA A+ certification exams take a keen interest in the particulars of the laser printing process, so it pays to know your way around a laser printer Let s take a look at the many components of a laser printer and their functions (Figure 179) Toner Cartridge The toner cartridge in a laser printer (Figure 1710) is so named because of its most obvious activity supplying the toner that creates the image on the page 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 Although this makes replacement of individual parts nearly impossible, it greatly reduces the need for replacement; those parts that are most likely to break are replaced every time you replace the toner cartridge Photosensitive Drum The photosensitive drum is an aluminum cylinder coated with particles of photosensitive compounds The drum itself is grounded to the power supply, but the coating is not When light hits these particles, whatever electrical charge they may have had drains out through the grounded cylinder Erase Lamp The erase lamp exposes the entire surface of the photosensitive drum to light, making the photosensitive coating conductive Any electrical charge present in the particles bleeds away into the grounded drum, leaving the surface particles electrically neutral Primary Corona The primary corona wire, located close to the photosensitive drum, never touches the drum When the primary corona is
Figure 179
Components inside a laser printer
Mike Meyers CompTIA A+ Guide: Essentials (Exam 220-601)
charged with an extremely high voltage, an electric field (or corona) forms, enabling voltage to pass to the drum and charge the photosensitive particles on its surface The primary grid regulates the transfer of voltage, ensuring that the surface of the drum receives a uniform negative voltage of between ~600 and ~1000 volts Laser The laser acts as the writing mechanism of the printer Any particle on the drum struck by the Figure 1710 Laser printer s toner cartridge laser becomes conductive, enabling its charge to be drained away into the grounded core of the drum The entire surface of the drum has a uniform negative charge of between ~600 and ~1000 volts following its charging by the primary corona wire When particles are struck by the laser, they are discharged and left with a ~100 volt negative charge Using the laser, we can write an image onto the drum Note that the laser writes a positive image to the drum Toner The toner in a laser printer is a fine powder made up of plastic particles bonded to iron particles The toner cylinder charges the toner with a negative charge of between ~200 and ~500 volts Because that charge falls between the original uniform negative charge of the photosensitive drum (~600 to ~1000 volts) and the charge of the particles on the drum s surface hit by the laser (~100 volts), particles of toner are attracted to the areas of the photosensitive drum that have been hit by the laser (that is, areas that have a relatively positive charge with reference to the toner particles) Transfer Corona To transfer the image from the photosensitive drum to the paper, the paper must be given a charge that will attract the toner particles off of the drum and onto the paper The transfer corona is a thin wire, usually protected by other thin wires, that applies a positive charge to the paper, drawing the negatively charged toner particles to the paper The paper, with its positive charge, is also attracted to the negatively charged drum To prevent the paper from wrapping around the drum, a static charge eliminator removes the charge from the paper In most laser printers, the transfer corona is outside the toner cartridge, especially in large commercial grade machines The transfer corona is prone to a build-up of dirt, toner, and debris through electrostatic attraction, and it must be cleaned It is also quite fragile usually finer than a human hair Most printers with an exposed transfer corona will provide a special tool to clean it, but you can also very delicately use a cotton swab soaked in 90 percent denatured alcohol (don t use rubbing alcohol because it contains emollients) As always, never service any printer without first turning it off and unplugging it from its power source Fuser Assembly The fuser assembly is almost always separate from the toner cartridge It is usually quite easy to locate as it will be close to the
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