3.1 Overview of the Assembly Process and Safety Issues
3.1.1 Overview of general safety issues
Assembling a computer helps to make the inner workings of a computer less mysterious and is considered a milestone by IT professionals. In fact, it helps to create the confidence needed to advance in the IT profession. Before beginning any assembly process, it is a good idea to review safety procedures. Assembling a computer is not an inherently dangerous job, but being aware of safety procedures is a good starting point. The following items should be taken into account when working with computers:
  • Keep the work area free of clutter and keep it clean.
  • Keep food and drinks out of the work area.
  • A computer monitor may store up to 25,000 volts, so users should avoid opening one unless they are trained to do so.
  • Remove all jewelry and watches.
  • Make sure the power is off and the power plug has been removed when working inside the computer.
  • Never look into a laser beam. Lasers are found in computer related equipment.
  • Make sure that a fire extinguisher and first aid kit is available.
  • Cover sharp edges with tape when working inside the computer case.

There are two safety concerns in leaving the computer plugged in while working inside it.

  1. First of all, it does not guarantee an equal electric potential between a person and the computer case. If anything, it will actually increase the current flow if there is a potential difference.
  2. Secondly, if the computer is plugged in, it has 120 volts inside the case (North America and some parts of Asia). This voltage can be 220 volts or more (Europe and the rest of the world).

By moving the machine around when still plugged to the power outlet, the power button might accidentally be hit and there would be a live machine. This creates a very dangerous situation. Also, if the power supply has a short to the hot line, there will be a hot chassis, which creates a lethal situation, even if it is turned off. Never work inside a machine that is plugged in unless additional precautions have been taken. Also, know where the power mains (or preferably, the circuit breakers) are located in case of a fire or short.

The importance of protecting the technician and the computer hardware cannot be over emphasized. The figure summarizes more safety measures and precautions that must be followed when assembling a computer. The student lab safety agreement from Chapter 1 "Information Technology Basics" can be consulted for more information. Recall that this contract requires the technician (student) to work in accordance to the safety procedures in this document.