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verify that a power supply is working or not working is to check the voltages coming out of the power supply with a multimeter (Figure 414) The voltages supplied by most PC power supplies can safely vary by as much as 10 percent of their stated values This means that the 12-volt line can vary from roughly 105 to 129 volts without exceeding the tolerance of the various systems in the PC The 50- and 33-volt lines offer similar tolerances If the power supply fails to provide power, throw it into the recycling bin and get a new one Do not open a power supply and try to service it yourself, because it contains dangerously high-voltage capacitors When power supplies die slowly, bad things begin to happen to the computer intermittently The computer locks up every once in a while, for example, or it takes two tries before it boots up in the morning Because a Blue Screen of Death (BSoD) in Windows can be caused by a lot of things, diagnosing a lockup as a power supply problem is tough to do The key is the word intermittent If you run into phantom problems, switch out the power supply to see if that makes a difference Every tech should have a known-good power supply as a field replaceable unit (FRU) Many devices in the computing world use an AC adapter (Figure 415) rather than an internal power supply Even though it sits outside a device, an AC adapter converts AC current to DC, just like a power supply Unlike power supplies, AC adapters are rarely interchangeable Although manufacturers of different devices often use the same kind of plug on the end of the AC adapter cable,
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FIGURE 414
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Testing one of the 5-volt DC connections
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CHAPTER 4 Motherboards, Power Supplies, and Cases
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FIGURE 415
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AC adapter
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these adapters are not necessarily interchangeable Just because you can plug an AC adapter from your friend s laptop into your laptop does not mean it s going to work! You need to make sure that three things match before you plug an AC adapter into a device: voltage, amperage, and polarity If the voltage or amperage output is too low, the device won t run If the polarity is reversed, it won t work just like putting in a battery backward in a flashlight If the voltage or amperage especially the latter is too high, on the other hand, you can quickly toast your device Don t do it! Always check the voltage, amperage, and polarity of a replacement AC adapter before you plug it into a device
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Cases
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ases come in six basic sizes: slimline, desktop, mini-tower, mid-tower, tower, and cube Slimline and desktop models generally sit on the desk, beneath the monitor The various tower cases usually occupy a bit of floor space next to the desk The mini-tower and mid-tower cases are the most popular choices Make sure you get a case that will fit your motherboard many microATX and all FlexATX cases are too small for a regular ATX motherboard Cube cases generally require a specific motherboard, so be prepared to buy both pieces at once A quick test fit before you buy saves a lot of return trips to the supplier
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Exam Tip
The six case sizes listed here apply only to consumer or workstation PCs Server PCs come in several different varieties, such as huge dual-power supply behemoths and rack-mounted systems too svelte to handle a normal expansion card The CompTIA A+ certification exams test you only on the consumer or workstation models The typical case has four screws on the back, two of which you remove with a Phillips-head screwdriver This releases the side panel and enables access to the interior of the case Panels slide into a slot so they should fit snugly Vendors such as Alienware offer myriad colors and exotic body styling More important, these cases are outfitted with detailing that enhances the PC s function, such as additional cooling fans or liquid cooling systems, high-output power supplies, cable management systems, roomier interiors, screwless body panels (these require no tools to remove), and such welcome touches as frontmounted USB, FireWire, and sound ports Other design features that separate better PC cases from lower-quality models are finished edges (these prevent nasty scrapes both to your knuckles and to cables), quick-release drive bays (Figure 416), a detachable motherboard mount tray, and a removable front bezel, or faceplate The more you work on PCs, the more you ll appreciate how these small features make it easier for you to service them If you re looking for pure aesthetic flash, case modification (mod) kits are available to trick out your boring beige box with neon and fiber-optic lighting, see-through acrylic panels, special LED speed and temperature displays, and fancy multimedia control panels These do nothing to enhance a PC s perfor-
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