B, C, D —The sound card, SIMM and motherboard are all components found inside the case; therefore, you should wear an ESD ground strap while handling those components. Answer A, the CRT, is a high-voltage internal component of the monitor and could cause serious injury if handled while wearing an ESD ground strap.
B — You should blow the dust and debris out of the case before removing the I/O cards to prevent dirt and debris from falling into the expansion slot connectors.
B — The Material Safety Data Sheet provides information about the proper storage, handling, and disposal of environmentally hazardous materials.
D — The purpose of the built-in resistor in an ESD grounding strap is to protect the technician from shock when working with live equipment.
A, B, D — As long as the lint-free cloth does not have any hazard material on it, it does not require special disposal procedures. Batteries, CRTs, toner or toner cartridges, electronic components, and ozone filters all require special disposal procedures, because they are considered environmentally hazardous materials.
B — EMI events are generally recoverable; ESD (static) events are not.
A — You should use Class C fire extinguishers for electrical fires.
CROSS REFERENCE
For more information about the subjects covered in this chapter, refer to the following pages and chapters in the books listed below.
Upgrading and Repairing PCs, Eighth Edition, Scott Mueller, Que
The Complete PC Upgrade & Maintenance Guide, Eighth Edition, Mark Minasi, Sybex
How Computers Work, Deluxe Edition, Ron White, Ziff-Davis
Most of the topics are also covered in earlier editions of the books, but you may have to look in the index for the correct chapters. Also note that newer technology topics are not covered in the earlier versions of these books.
Topic
Upgrading and Repairing PCs
The Complete PC
How Computers Work
PMs, Safety, Environmental issues, ESD
Pages 30-63
Pages 178-196, 590-592
N/A
ACTIVITIES
In the following activities, you practice cleaning a dirty mouse and properly disposing of potentially hazardous materials.
Recommended Equipment
For Activity 1, you need a mouse (pointing device), approved cleaning solvent, two lint-free rags, and a couple of swabs.
For Activity 2, you need a copy of a company’s procedures on disposal of hazardous materials and/or a copy of the Material Safety Data Sheets (MSDSs) for the printer ribbon, compressed air can, and battery.
Activity 1 — Cleaning a Dirty Mouse
In this activity, you will learn how to clean a mouse to ensure its proper operation.
Clean the exterior of the mouse with the approved cleaning solvent (not acetone or fingernail polish remover) and a rag. Be careful not to get it too wet.
Open the mouse ball ring (the bottom of mouse) and clean the ball using the cleaning solvent and one of the lint-free rags.
Dry off the ball with the dry lint-free rag.
Remove dirt, dust, or lint inside the mouse with a lint-free cloth or a swab.
Make sure the mouse is dry inside.
Put the mouse back together.
Test the mouse to make sure it operates correctly.
Activity Review Questions
Do you want to use acetone on the mouse? (true or false)
Should you wash the mouse ball with soap and water? (yes or no)
Does it make any difference how wet you get the mouse? (yes or no)
Activity Review Answers
False. Acetone should never be used on a mouse. The mouse is plastic and acetone dissolves plastic.
No. You may use warm water, but not soap. Soap leaves a residue that could affect the device’s performance.
Yes. You do not want to short out the mouse by getting it too wet.
Activity 2 — Properly Disposing of Potentially Hazardous Materials
If you are able to obtain a disposal policy or material safety data sheet for a particular company, you can complete the following exercises. You should always familiarize yourself with the proper handling and disposal of potentially hazardous material.
Check the company procedures for information on disposal of potentially hazardous materials.
If you can’t get a company procedure or if the procedure is unclear, check the MSDSs provided with each product or class of products.
Check the disposal procedures or MSD for the old printer ribbon. Write the procedure below.____________________________________________________________________________________
_________________________________________________________________________________________
_________________________________________________________________________________________
_________________________________________________________________________________________
Check the disposal procedures or MSD for the empty compressed air can. Write the procedure below.____________________________________________________________________________________
_________________________________________________________________________________________
_________________________________________________________________________________________
_________________________________________________________________________________________
Check the disposal procedures or MSD for the dead CMOS battery. Write the procedure below.____________________________________________________________________________________
_________________________________________________________________________________________
_________________________________________________________________________________________
_________________________________________________________________________________________
In this activity, you learned how to find the proper disposal procedures for potentially hazardous materials. If you are in doubt about a substance, you should investigate to see whether it is a potentially hazardous material.
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