Rosewill Computer Case 422 Informations techniques télécharger pdf (Page 48)

Mobile Device Issues

131

Disassembly

and Power

Figure 4.14 Scribe used to remove a laptop plastic piece

Laptop/netbook speakers commonly mount above or to the side of the keyboard. The

keyboard usually has to be removed to reach the speakers. Sometimes, speaker cables run

alongside the keyboard and must be pried out of the case. The DC power plug commonly has a

similar cable, as shown in Figure 4.15.

Internal

power cord

plug

Figure 4.15 Laptop DC power plug cable

1 2 ... 43 44 45 46 47 48 49 50 51 52 53 ... 149 150

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 Certication 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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