Rosewill Computer Case 422 Informações Técnicas Página 82
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Review Questions
Disassembly
and Power
4
• Ensure that a surge protector has a Class A rating and adheres to the UL 1449 standard.
• Ensure that a UPS outputs a sine wave from the battery and can output enough power
for attached devices.
• Have a Type C or Type A-B-C fire extinguisher around in case of fire.
• In all communications and written documentation, be professional and effective. Use
proper capitalization, grammar, punctuation, and spelling.
Key Terms
AC .................................. 134
AC circuit tester ........... 153
ACPI .............................. 147
amp ............................... 135
antistatic wrist strap ..... 120
auto-switching .............. 151
Berg ............................... 138
blackout ........................ 155
brownout....................... 155
capacitor ....................... 135
clamping speed ............. 156
clamping voltage .......... 156
continuity ..................... 135
current .......................... 135
DC ................................. 134
dual-rail power supply .. 151
EMI ................................ 122
energy absorption/
dissipation ..................... 157
ESD ............................... 120
grounding ..................... 120
I/O shield ....................... 129
Li-ion battery ................ 145
line conditioner ............ 157
modem isolator ............. 161
Molex ............................. 138
MOV............................... 156
ohm ............................... 135
overvoltage .................... 154
phone line isolator ....... 161
pin 1 .............................. 125
power ............................. 135
power good signal ......... 139
power supply tester ...... 144
preventive
maintenance ................. 132
resistance ...................... 135
RFI ................................. 122
sag ................................. 155
scribe ............................. 130
spike .............................. 155
SPS ................................ 160
standby power ............... 134
standoff ......................... 129
surge ............................. 155
surge protector ............. 155
TVS rating ..................... 157
Type A-B-C fire
extinguisher ................. 161
Type C fire
extinguisher .................. 161
UL 1449 VPR .................157
undervoltage ................. 154
UPS ................................ 158
volt ................................ 134
voltage ........................... 134
Wake on LAN ................ 148
Wake on Ring ............... 148
watt ............................... 135
Review Questions
1. What would happen if you removed the battery from the motherboard by accident?
2. List three tasks commonly performed during preventive maintenance.
3. Computers used in a grocery store warehouse for inventory control have a higher part
failure rate than the other company computers. Which of the following is most likely to
help in this situation?
a. an antistatic wrist strap
b. a preventive maintenance plan
c. antistatic pads
d. high wattage power supplies
- Guide to PCs 2
- Complete CompTIA 3
- Contents at a Glance 4
- Contents 10
- Contents 11
- About the Author 19
- Dedication 20
- Acknowledgments 20
- We Want to Hear from You! 21
- Reader Services 21
- It Pays to Get Certified 22
- CompTIA Career Pathway 23
- Steps to Certication 23
- Content Seal of Quality 24
- Why CompTIA? 24
- Introduction 25
- Organization of the Text 26
- Features of This Book 27
- IT work 31
- CompTIA A+ Exam Objectives 32
- CompTIA Exam Objectives 33
- Disassembly 36
- Disassembly Overview 37
- Electrostatic Discharge (ESD) 37
- Opening the Case 41
- Cables and Connectors 41
- Snug connections 43
- Storage Devices 45
- Motherboards 46
- Mobile Device Issues 47
- Reassembly 49
- Preventive Maintenance 49
- Basic Electronics Overview 51
- Electronics Terms 51
- Good connection Broken wire 53
- Power Supply Overview 54
- Power Supply Form Factors 55
- Tech Tip 56
- Purposes of a Power Supply 58
- Power Supply Voltages 60
- Mobile Device Power 61
- Keep Li-ion batteries cool 63
- Power Interface) 64
- Windows power management 65
- Watch the wattage 68
- Solving Power Supply Problems 70
- Adverse Power Conditions 71
- Adverse Power Protection 72
- Surge Protectors 72
- Line Conditioners 74
- Figure 4.32 Line conditioner 75
- Figure 4.33 Sine wave and 75
- Standby Power Supply (SPS) 77
- Electrical Fires 78
- Computer Disposal/Recycling 79
- Chapter Summary 81
- Review Questions 82
- Exercises 85
- External Cables 86
- Computer Case Removal 86
- Adapter Placement 86
- Motherboard 88
- Lab 4.3 Amps and Wattage 89
- Lab 4.4 Continuity Check 89
- Lab 4.5 Pin-Out Diagramming 90
- Lab 4.6 Fuse Check 91
- Lab 4.7 Using a Multimeter 91
- Figure 4.38 AC outlet 93
- GND to hot 120VAC 93
- GND to neutral 0VAC 93
- Hot to neutral 120VAC 93
- +5 volts 95
- +12 volts 95
- Activities 97
- Critical Thinking Skills 99
- A+ Certification Exam Tips 99
- Complete PC Restore tool 107
- FireWire 114
- IRQs (Interrupt Requests) 120
- PBs (petabytes) 129
- Setup program 136
- SSDs (solid state drives) 138
- SSDs (solid state drives) 139
- TBs (terabytes) 140
- troubleshooting 143
- video 145
- Windows 147
- Windows Vista 148
- Windows Vista 149
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