zxing barcode scanner c# Tools of the Trade and ESD Avoidance in Software

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Tools of the Trade and ESD Avoidance
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Phillips-head screwdriver Hemostat Flat-head screwdrivers Phillips-head screwdriver
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Before we dive into the PC, you need two pieces of information: an overview of the most common tools you ll find in a tech s toolkit and how not to destroy hardware inadvertently through electrostatic discharge
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Tools of the Trade
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The basic technician toolkit consists of a Phillips-head screwdriver and not much else seriously but a half dozen tools round out a fully functional toolkit Most kits have a star-headed Torx wrench, a nut driver or two, a pair of tweezers, a little grabber tool, and a hemostat to go along with Phillips-head and flat-head screwdrivers (Figure 25)
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Figure 25
Typical technician toolkit
2: The Visible PC
Figure 26
Close-up of a printed circuit board (PCB)
A lot of techs will throw in a magnifying glass and a flashlight for those hard-to-read numbers and text on the printed circuit boards (PCBs) that make up a large percentage of devices inside the system unit (Figure 26) Contrary to what you might think, techs rarely need a hammer
Essentials
Avoiding Electrostatic Discharge
If you decide to open a PC while reading this chapter, as I encourage you to do, you must take proper steps to avoid the greatest killer of PCs electrostatic discharge (ESD) ESD simply means the passage of a static electrical charge Have you ever rubbed a balloon against your shirt, making the balloon stick to you That s a classic example of static electricity When that static charge discharges, you may not notice it happening although on a cool, dry day, I ve been shocked so hard by touching a doorknob that I could see a big, blue spark! I ve never heard of a human being getting anything worse than a rather nasty shock from ESD, but I can t say the same thing about computers ESD will destroy the sensitive parts of your PC, so it is essential that you take steps to avoid ESD when working on your PC
All PCs are well protected against ESD on the outside unless you take a screwdriver and actually open up your PC, you really don t need to concern yourself with ESD
Anti-static Tools
ESD only takes place when two objects that store different amounts (the hip electrical term to use is potential ) of static electricity come in contact
Mike Meyers CompTIA A+ Guide: Essentials (Exam 220-601)
The secret to avoiding ESD is to keep you and the parts of the PC you touch at the same electrical potential You can accomplish this by connecting yourself to the PC via a handy little device called an anti-static wrist strap This simple device consists of a wire that connects on one end to an alligator clip and on the other end to a small metal plate that secures to your wrist with an elastic strap You snap the alligator clip onto any handy metal part of the PC and place the wrist strap on either wrist Figure 27 shows a typical antistatic wrist strap in use Figure 27 Anti-static wrist strap in use Anti-static wrist straps are standard equipment for anyone working on a PC, but other tools might come in handy One of the big issues when working with a PC stems from the fact that in many situations you find yourself pulling out parts from the PC and setting them aside The moment you take a piece out of the PC, it no longer has contact with the systems and may pick up static from other sources Techs use anti-static mats to eliminate this risk An anti-static mat acts as a point of common potential you can usually purchase a combination anti-static wrist strap and mat that all connect together to keep you, the PC, and any loose components at the same electrical potential (Figure 28)
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