Rosewill Computer Case 422 Informazioni Techniche Pagina 43
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Chapter 4 • Disassembly and Power
Arrow
shows pin 1
on the cable
Stripe
shows pin 1
on the cable
Arrow
shows pin 1
on the cable
Figure 4.5 Pin 1 on a ribbon cable
Just as every cable has a pin 1, all connectors on devices, adapters, or motherboards have
a pin 1. Pin 1 on a cable inserts into pin 1 on a connector. Cables are normally keyed so that
they insert only one way. Some manufacturers stencil a 1 or a 2 by the connector on the moth-
erboard or adapter; however, on a black connector, it’s
difficult to see the small number. Numbers on adapters
are easier to distinguish. When the number 2 is etched
beside the adapter’s connector, connect the cable’s pin
1 to this side. Remember that pins 1 and 2 are always
on the same side, whether on a connector or on a
cable. Some technicians use a permanent marker to
label a cable’s function. Figure 4.6 shows an example of
a stenciled marking beside an adapter’s connector. Figure 4.6 illustrates the number 2 etched
onto the adapter, but other manufacturers stencil a higher number, such as 33, 34, 39, or 40,
beside the opposite end of the connector.
2
Pin 1 of the cable connects to
pin 1 on the adapter connector
J5
Figure 4.6 Pin 1 on an adapter
Motherboard connectors are usually notched so that the cable inserts only one way; how-
ever, not all cables are notched. Some motherboards have pin 1 (or the opposite pin) labeled.
Always refer to the motherboard documentation for proper orientation of a cable into a moth-
erboard connector. Figure 4.7 shows the motherboard connectors used for the thin cables
shown in Figures 4.3 and 4.4. These connectors commonly have hard drives and optical drives
attached. Figure 4.8 show three other motherboard connectors that are notched.
Snug connections
When connecting cables to a motherboard or
internal components, ensure that each cable is
connected tightly, evenly, and securely.
Tech
Tip
- 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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