5 and 12 Volts DC to all internal components of the PC and protection from the environment.
5 and 12 Volts AC to all internal components of the PC and protection from the environment.
An internal battery backup power device used in the event of a power failure.
An external battery backup power device used in the event of a power failure.
QUIZ ANSWERS
A — All backplates should be installed to help keep the internal components of the computer cooler by allowing proper airflow through the air plenum of the case. Answer B is incorrect because you don’t want to increase the ambient heat around internal components. Answers C and D are wrong because the backplates have no effect on electrostatic discharge (ESD).
A and D — The output voltage of a PC power supply provides 5 and 12 volts DC to the internal components on the PC; therefore, answers B and C are incorrect.
C — The P8 and P9 connectors provide power to the motherboard and the black leads of the two connectors should be toward each other. Answer A is incorrect because the P8 and P9 connectors don’t provide power to the hard disk drive; Answer D is incorrect because the P8 and P9 connectors don’t provide power to the CD-ROM drive.
C — The Socket 3 socket can accept only the 486 processor; however, the Pentium overdrive processor and some other brands of processors can also fit in the Socket 3 socket.
B — Only Pentium chips can be plugged into the Socket 7 socket. The Pentium 90 chip, which was a short-lived version of Pentium chip, is the only exception to this general rule.
B and D — The CMOS chip is battery powered and has a real-time clock that stores the date and time along with the hardware configuration information. Answers A and C are incorrect because the POST and a basic communications program are stored on the BIOS chip.
A and C — The BIOS chip stores the POST and a small basic I/O program that allows the CPU to communicate with the peripheral devices. Answers B and D are incorrect because the time, date, and hardware configuration information are stored on the CMOS chip.
A — Eight addresses, numbered from 0 to 7, are available on the SCSI bus.
A — The SCSI host adapter (controller) ID should be set to 7. All other installed devices are set using ID numbers from 0 to 6.
C — A SCSI bus has two ends and both ends must be terminated with a resistor pack. The devices that are connected to the SCSI bus have a passive connection; therefore, they do not need to be terminated.
A, B, and D — The EIDE standard (ATA-2) provided several enhancements over the original IDE interface, including support for up to 4 devices, an ATAPI interface to support tape drives and CD-ROMs, and support for drives larger than 504 MB.
B — Even though the sockets look the same, the motherboard must have additional circuitry to support the EDO technology; therefore not all motherboards can support EDO memory.
A — The case and power supply protect the internal components of a computer and provide 5 volts DC and 12 volts DC to the motherboard and all internal components of the PC.
CROSS REFERENCE
For more information about the subjects covered in this chapter, refer to the following pages and chapters in the books listed below.
Upgrading and Repairing PCs, Eighth Edition, Scott Mueller, Que
The Complete PC Upgrade & Maintenance Guide, Eighth Edition, Mark Minasi, Sybex
How Computers Work, Deluxe Edition, Ron White, Ziff-Davis
Most of the topics are also covered in earlier editions of the books, but you may have to look in the index for the correct chapters. Also note that newer technology topics are not covered in the earlier versions of these books.
Topic
Upgrading and Repairing PCs
The Complete PC
How Computers Work
Case/Pwer Supply
Pages 291-312
Pages 26-51, 408-409
Page 3
Motherboard
Pages 90-104
Pages 159-160, 308-324
N/A
CMOS
Pages 329-331
Pages 191, 313-318
N/A
BIOS
Pages 85-88
N/A
Pages 22-25
Processor Chip
Pages 159-222
Pages 63-95
Pages 56-63
RAM
Pages 223-273
Pages 362-388
Pages 42-47
Bus Architectures
Pages 105-139
Pages 125-155
Pages 114-121
Hard Drive Technologies
Pages 628-684
Pages 434-487
Pages 82-89, 96-103
Video Technologies
Pages 396-424
Pages 950-968
Pages 126-135
ACTIVITIES
In these activities, you will learn to identify the various major hardware components of a PC.
Recommended Equipment
To complete these activities, you should have at least a PC with hard drive, floppy drive, I/O card, video card, and possibly a CD-ROM. If you are going to open the PC’s case, you will also require a Phillips head screwdriver and anti-static wrist guard.
Activity 1 — Exterior Inspection
Describe the exterior environment of the system.
Identify the Case and Power supply.
Locate the power switch.
Find the intake vents on the computer case.
Locate the exhaust vent on the power supply.
Activity 2 — Interior Inspection
Identify the following components in the system.
Locate the CPU and/or CPU socket.
Find the RAM and/or RAM sockets.
Identify the BIOS chip.
Describe the types of I/O cards that are present in this system.
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