Electrostatic Discharge (ESD)

You have to take many precautions as soon as disassembling a computer. The electronic circuits situated on the motherboard and adapters are subject come ESD. ESD (electrostatic discharge) is a difference of potential in between two item that reasons static electricity. Static electrical power can damages electronic tools without the technician’s knowledge. The average person requires a revolution discharge of 3,000 volts prior to he or she feels it. An digital component deserve to be damaged through as tiny as 30 volts. Part electronic contents may not be damaged the an initial time static electricity occurs. However, the results of static electrical power can be cumulative, weakening or eventually ruining a component. One ESD event is not recoverable—nothing have the right to be done about the damage it induces. Electronic chips and memory modules are most susceptible come ESD strikes.

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Atmospheric conditions impact static electricity. Once humidity is low, the potential for ESD is higher than at any kind of other time; however, too much humidity is negative for electronics. Keep humidity between 45 and also 55 percent to mitigate the hazard of ESD.

A technician deserve to prevent ESD by utilizing a variety of methods. The most usual tactic is to usage an antistatic wrist strap. One finish encircles the technician’s wrist. In ~ the other end, one alligator clip attaches to the computer. The clip attaches to a grounding article or a metal component such together the power supply. The electronic symbol for ground follows:


An antistatic wrist strap allows the technician and also the computer system to be at the very same voltage potential. As long as the technician and the computer or electronic component are at the exact same potential, static electrical energy does not occur. An exercise at the finish of the thing demonstrates just how to attach an antistatic wrist strap and also how to carry out maintenance ~ above it. Technicians need to use one ESD wrist strap at any time possible.

A resistor inside an antistatic wrist strap protects the technician in case something accidentally touch the ground come which the strap attaches while that or she is working inside a computer. This resistor cannot safeguard the technician versus the feasible voltages inside a monitor. See number 4.1 for an illustration of one antistatic wrist strap. Figure 4.2 reflects a great location for attaching one antistatic wrist strap.


Figure 4.1. Antistatic wrist strap


Figure 4.2. It is registered an antistatic wrist strap

technology Tip: as soon as not come wear an antistatic wrist strap

Technicians should not wear an ESD wrist strap as soon as working within a CRT monitor due to the fact that of the high voltages there.

Antistatic bags are an excellent for storing spare adapters and also motherboards as soon as the parts are not in use. However, antistatic bags lose their effectiveness after a few years. Antistatic carpet are available to location underneath a computer being repaired; together a mat may have actually a snap because that connecting the antistatic wrist strap. Antistatic heel straps are also available.

If an antistatic wrist strap is no available, you can still minimize the opportunity of ESD damage. ~ removing the computer case, continue to be attached come an unpainted metal computer system part. One such part is the power supply. If you are right-handed, ar your bare left arm on the strength supply. Eliminate the computer parts one by one, always keeping her left elbow (or some other bare part of your arm) connected to the strength supply. If you space left-handed, place your ideal arm on the strength supply. Through placing her elbow top top the strength supply, both hands are totally free to remove computer system parts. This technique is one effective method of keeping the technician and also the computer at the same voltage potential, hence reducing the possibility of ESD damage. That is no as for sure as making use of an antistatic wrist strap. Also, remove the strength cable indigenous the earlier of the computer system is a an excellent idea. A strength supply provides a little amount of power to the motherboard even when the computer system is powered off. Constantly unplug the computer and use an antistatic wrist strap as soon as removing or replacing parts inside a computer!

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