Fiber-Optic Receivers 428
Troubleshooting Fiber-Optic Systems 429
24.2 LASERS 429
Laser Construction 429
Types of Lasers 430
Applied E&E: Night Vision Devices 431
Laser Applications 432
Laser Safety 433
Laser Classification 433
Chapter 25 Introduction to the Personal Computer (PC) 435
25.1 PC REPAIR 436
Common Points of Hardware Failure 437
Data Recovery 438
Computer Technology Certifications 438
The PC as a Tool 438
25.2 COMPUTER DESIGN, COMPONENTS, AND
TECHNOLOGIES 438
The Case 439
Form Factor 439
Input Devices 440
Power Supply 440
Motherboard 440
CPU 442
Memory 442
BIOS 445
Chipsets 446
Mass Storage Devices 447
CD Drives 448
Modem 450
25.3 SOFTWARE 451
BIOS Software 451
Operating System (OS) 451
Drivers 452
Viruses 453
25.4 COMPUTER DEVICES 454
Dot Matrix Printer 454
Inkjet Printer 454
Laser Printer 455
Scanner 456
Digital Camera 457
Computer CRT 457
Multimedia Card/Video Adapter Card 458
25.5 LAN, WAN, AND THE INTERNET 458
LAN 458
WAN 459
Internet 459
DSL 460
Cable Modem 460
14 Electricity & Electronics
SECTION
5