Chapter 11 Flashcards
When discussing safety issues with regard to PCs let’s break them down into four general areas: p 505
Computer components
Electrostatic discharge
Electromagnetic interference
Natural elements
There’s one exception to the power-off rule: p505
You don’t have to power off the computer when working with hot-swappable parts which are designed to be unplugged and plugged back in when the computer is on
The two biggest dangers with power supplies are what? p505
Burning yourself and electrocuting yourself
Power supplies contain several capacitors that can hold what? p505
Lethal charges long after they have been unplugged
When talking about power and safety you will almost always hear the saying. p 506
It’s not the volts that kill you it’s the amps
If you ever have to work on a power supply for safety’s sake you should discharge all what? p506
Capacitors within it
Other than the power supply the most dangerous component to try to repair is a what? p 506
(CRT) cathode-ray tube monitor
If you have to open a monitor you must first discharge the high-voltage charge on it by using a what? p507
High-voltage probe
Do not use an ________ when discharging the monitor doing so can lead to a fatal electric shock. p507
ESD strap
These types of devices require an ______ which provides the high-voltage high-frequency energy needed to power the backlight. p507
inverter
Small circuit board installed behind the LCD panel that takes AC power and converts it for the backlight. p507
Inverter
Generally made of metal and some have very sharp edges inside that can cut you. p507
Cases
(ESD) stands for what? p508
Electrostatic discharge
Happens when two objects of dissimilar charge come in contact with one another. The two objects exchanges electrons in order to standardize the electrostatic charge between them. This charge can and often does damage electronic components. p509
ESD
CPU chips and memory chips are particularly sensitive to what? p509
ESD
A device that is specially designed to bleed electrical charges away safely. p 511
ESD strap
This mat drains excess charge away from any item coming in contact with it. p 511
ESD Antistatic Mats
Important tools to have at your disposal when servicing electronic components because they protect the sensitive electronic devices from stray static charges. p511
Antistatic bags
Unlike antistatic mats, antistatic bags do not ________ the charges away and they should never be used in place of an antistatic mat. p511
Drain
Is not as effective as using proper anti-ESD gear but it makes up for that with its simplicity. p512
Self- grounding
(ICs) stands for what? p512
Integrated circuits
(EMI) stands for what? p513
Electromagnetic interference
(RFI) stands for what? p513
Radio frequency interference
An unwanted disturbance caused by electromagnetic radiation generated by another source. p513
EMI
Work by generating an electromagnetic field. p 513
Magnet
Can operate at a variety of frequencies. Some of the more common ones are 900MHz 1.9GHz 2.4GHz and 5.8GHz. p 513
Cordless phones
Convenient devices to heat foods and beverages. The radiation they generate is typically in the 2.45GHz range although it can vary slightly. p 513
Microwave ovens
PC techs also commonly carry the following tools: p517-518
Pliers Wire cutters Strippers Mirrors Flash lights Compressed air
They use this for cables so that you don’t trip on them when you are working what is this called? p518
Floor cable guard
Another useful tool to keep cables under control is a what? p519
cable ties
(OSHA) stands for what? p520
Occupational Safety and Health Administration
Requires employers to provide a workplace that is free of recognized danger and hazards. p520
OSHA
(MSDS) stands for what? p522
Material Safety Data Sheets
Four major classes of fire extinguishers are available one for each type of flammable substance: p523
A= for wood and paper fires B= for flammable liquids C= for electrical fires D= (metal powder or NaCI [salt]) for flammable metals such as phosphorus and sodium
The most popular type of fire extinguisher today is the multipurpose. p 523
ABC rated extinguisher
