c# read qr code from image 7: Installing and Troubleshooting Power Supplies in Software

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7: Installing and Troubleshooting Power Supplies
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After reading this chapter and completing the exercises, you should understand the following about installing and troubleshooting power supplies
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Install and Upgrade Power Supplies
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Power supplies connect to the PC case via four screws mounted in the rear of the case Unscrew the four screws and the power supply will lift out As ATX power supplies are always on, be sure to unplug it from the wall outlet before working on it
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Understand and Implement System Cooling
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Adequate cooling is important to prevent damage to the computer s internal components The fan inside the power supply itself cools the voltage regulator circuits within the power supply and provides a constant flow of outside air throughout the interior of the computer case If the fan is not working, turn the computer off before you experience equipment failure Some power supplies regulate airflow by using a sensor, with a three-wire connector that plugs into the motherboard To improve cooling, most cases come with a case fan If the case does not have one, you should add one Most case fans use standard Molex connectors, but some use a special three-pronged power connector that plugs directly into the motherboard To enable the fans to create airflow, the case needs to be closed If slot covers are left off empty expansion bays, it can cause the computer to overheat Slot covers also help keep dust and smoke out of the case Beware of great deals on cases that come with power supplies, as the included power supply is often substandard
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Electrical problems range from irregular AC to dying or faulty power supplies Power supplies may fail suddenly or slowly over time After you make sure that the wall outlet is providing electricity, checking voltages from the power supply with a voltmeter is the best way to verify that the power supply is working or has failed A power supply is functioning properly if the output voltages are within 10 percent over or under the expected voltage Be sure to check all the connections on the power supply If you determine that it is bad, the most economical solution is to throw it away and replace it with a new one Power supplies will not start unless they are connected to a motherboard If you need to test a power supply but don t have a motherboard, use an ATX tester If one of the internal electrical components in the power supply begins to fail, the result is usually intermittent problems, making it difficult to diagnose If you are experiencing intermittent problems, such as lockups or different error codes that disappear after rebooting, suspect the power supply Unfortunately, the voltmeter is not good for diagnosing intermittent problems Since power supply failures rank second behind floppy drive failures, it is a good idea to keep power supplies in stock for swapping and testing Never open a power supply, even to check the fuse, because the unit contains capacitors that carry high voltage charges that can hurt you Every PC workbench should have a Class C fire extinguisher handy in case of an electrical fire Although some fire extinguishers are multi-class, handling all types of fire, use only a Class C fire extinguisher on your PC
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Key Terms
3-pin fan connector (92) airflow (91) ATX tester (94) case fan (90) Class A fire extinguisher (95) Class B fire extinguisher (95) Class C fire extinguisher (95) manually adjustable fan (92) Molex connector (90) power supply fan (90) power supply unit (PSU) (88) slot covers (91)
Mike Meyers CompTIA A+ Guide: PC Technician (Exams 220-602, 220-603, & 220-604)
Key Term Quiz
Use the Key Terms list to complete the sentences that follow Not all terms will be used 1 The _______________ provides the basic cooling for the PC 2 As long as an ATX _______________ is plugged in, it supplies electricity to the motherboard 3 A case fan usually gets power via a standard _______________ 4 A(n) _______________ is required for electrical fires 5 Some fans connect to the motherboard via a(n) _______________ 6 You can test a power supply with a small device known as a(n) _______________ 7 To maintain airflow inside your case, make sure all _______________ are covered 8 _______________are large, square fans that attach directly to the computer case 9 _______________ have a knob that enables you to control the speed of the fan 10 Leaving a case open prevents proper _______________ and causes a loss of cooling efficiency
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