Rosewill Computer Case 422 Informações Técnicas Página 91
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Chapter 4 • Disassembly and Power
6. Power off the meter.
Instructor initials: _____________
7. Return all supplies to the instructor.
Lab 4.6 Fuse Check
Objective: To determine if a fuse is good
Parts: Multimeter
Fuse
Procedure: Complete the following procedure and answer the accompanying questions.
1. Obtain a meter and a fuse from your instructor.
2. Look at the fuse and determine its amp rating.
What is the amperage rating of the fuse?
3. Set the meter to ohms.
Instructor initials: _____________
4. Power on the meter.
5. Connect one meter lead to one end of the fuse. Connect the other meter lead to the oppo-
site end.
6. Look at the resistance reading on the meter.
What is the resistance reading?
Is the fuse good?
7. Power off the meter.
Instructor initials: _____________
8. Return all materials to the instructor.
Lab 4.7 Using a Multimeter
Objective: To check voltage and resistance levels using a multimeter
Parts: Multimeter
AA, AAA, C, D, or 9-volt battery
Extended paperclip or wire
Caution: Keep both hands on the behind the protective rings on the meter handles. See
Figures 4.16 and 4.17.
Procedure: Complete the following procedure and perform the accompanying activities.
1. All voltage inside the computer is DC voltage (except for some parts inside the power sup-
ply, of course). Learning how to measure DC voltage is important for a technician. The
best place to start is with a battery. Obtain a battery. Look carefully at the battery and
determine where the positive end or connector is located (usually has a + (plus) symbol
nearby) and where the negative end or connector is located.
Why is it important to locate positive and negative on a battery?
2. Look carefully at the battery and determine the voltage rating. Document your findings.
DC voltage:
3. Place the battery on a flat surface. If the battery is an AA, AAA, C, or D battery, place the
battery so that the positive side (the side with a nodule) pointing toward your right side. If
the battery is a 9-volt battery, place the battery so that the connectors are facing you and
the positive connector (the smaller connector) is on your right side.
- 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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