java barcode reader sdk 8: Power Supplies in Software

Creating UPC-A in Software 8: Power Supplies

140 8: Power Supplies
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S 30 minutes
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Lab Exercise 804: Power Protection
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You ve successfully xed your client s power-problem-plagued PC (say that ve times fast!), but now you ve noted that she has nothing in the way of power protection for her system, nor do any of her coworkers None! When you mention this to her, she tells you that her boss never really saw the point of spending money on surge protectors, uninterruptible power supplies, or any of that stuff With a straight face, she asks, Do those things really do any good Now it s your task to sell the boss on the idea of power protection To do this, you must explain the types of power problems that lurk in the bushes just waiting to pounce on unwary users without power protection, and suggest precautions that they can take to prevent power-related damage
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Learning Objectives
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At the end of this lab, you ll be able to
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Explain the need for power protection Explain the types of power protection available for a PC
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Cross-Reference
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For details on power protection, refer to the Surge Suppressors and UPS sections in 8 of Mike Meyers A+ Guide to Managing and Troubleshooting PCs
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Lab Materials and Setup
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The materials you need for this lab are
A working PC
Getting Down to Business
Too often, PC users take the electricity that powers their system for granted After all, there s not much you can do about the electricity, is there Not so! Armed with the knowledge of the types of power conditions that can affect your PC, you can best determine what precautions to take Step 1 Describe the following types of power conditions and the types of damage they can cause Power spike ____________________________________________________________________ Brownout ______________________________________________________________________ Blackout _______________________________________________________________________
Lab Analysis Test 141
Step 2 Describe the following types of power protection equipment Surge suppressor _________________________________________________________________ Online uninterruptible power supply (UPS) ____________________________________________ Standby UPS ____________________________________________________________________
Lab Analysis Test
1 2
Your client calls you and says that her PC is unusually quiet and keeps rebooting for no apparent reason What should you ask her to check Athena lives in an area where the power is often interrupted She bought a good surge protector strip, but that does not seem to help What does she need to prevent her system from shutting down unexpectedly Your assistant technician calls you and says he suspects a bad power supply in one of your client s systems He said the multimeter readings are 1265 volts and 415 volts What should he do One of your clients has an older Pentium 4 system with a single IDE hard drive and 512 MB of RAM He had been using this PC as his main workstation, but he s recently purchased a newer system and now wants to redeploy the older system as a le server on his network He has ordered a PCI SCSI controller board and three SCSI hard drives, so that he can con gure a RAID array, and an additional 2 GB of RAM He also ordered two Y adapters for the power supply connectors He asks for your advice about any additional hardware he should order What do you tell him What are the power requirements of the following system __________________
3 4
AMD Athlon 64 X2 CPU and 512 MB RAM Two Serial Advanced Technology Attached (SATA) hard drives and one oppy drive One CD-RW drive and one DVD-ROM drive PCIe video PCI sound card NIC
142 8: Power Supplies
Key Term Quiz
Use the following vocabulary terms to complete the following sentences Not all terms will be used 33 V 5V 12 V 20-pin P1 24-pin P1 Molex connector P4 P8/P9 power sags power spikes power supply UPS
1 2 3 4 5
The ATX 12V 20 power supply plugs into the motherboard using the __________________ connector(s) PC devices with motors, such as hard drives and CD-ROM drives, usually require __________________ of DC electricity from the power supply Hard drives and CD-ROM drives connect to the power supply with a __________________ A surge protector prevents damage from __________________ in the voltage Pentium 4 motherboards have both __________________ and __________________ power connectors
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