Rosewill Computer Case 422 Technical Information PDF herunterladen (Seite 85)

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Chapter 4 • Disassembly and Power

18. List three recommendations for good technical written communication.

19. What type of fire extinguisher can be used on electronic equipment?

20. List three recommendations for saving power on a laptop.

Exercises

Lab 4.1 Performing Maintenance on an Antistatic Wrist

Strap

Objective: To understand how to care for and properly use an antistatic wrist strap

Parts: Antistatic wrist strap

Computer chassis

Multimeter

Note: Electrostatic discharge (ESD) has great potential to harm the electronic compo-

nents inside a computer. Given this fact, it is vitally important that you practice

proper ESD precautions when working inside a computer case. One tool you can

use to prevent ESD is an antistatic wrist strap. This tool channels any static elec-

tricity from your body to the computer’s chassis, where it is dissipated safely.

Procedure: Complete the following procedure and answer the accompanying questions.

1. Examine the wrist strap for any obvious defects such as worn or broken straps, loose

grounding lead attachments, dirt or grease buildup, and so on.

2. If necessary, remove any dirt or grease buildup from the wrist strap, paying close atten-

tion to the electrical contact points such as the wrist contact point, the ground lead

attachment point, and the computer chassis attachment clip. Use denatured alcohol to

clean these contact points.

3. If possible, use a multimeter to check continuity between the wrist contact point and the

computer chassis attachment clip. A reading of zero ohms of resistance indicates a good

electrical pathway.

How many volts of static electricity does it take to harm a computer’s electrical

components?

4. Adjust the wrist strap so it fits snugly yet comfortably around your wrist. Ensure that the

wrist contact is in direct contact with your skin, with no clothing, hair, etc., being in the

way.

5. Attach the ground lead to the wrist strap and ensure it snaps securely into place.

6. Attach the computer chassis attachment clip to a clean metal attachment point on the

computer chassis.

7. Any static electricity generated or attracted by your body will now be channeled through

the antistatic wrist strap to the computer chassis, where it will be safely dissipated.

How many volts will an ESD be before you will feel anything?

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Rosewill Computer Case 422 Technical Information Seite 85