Understanding Operational Procedures Flashcards
An ESD strap is a device that is specially designed to bleed electrical charges away safely. It uses a ___ to bleed the charge away slowly.
1 megohm resistor
The number of ___ in a power source represents its potential to do work.
volts
volts don’t do anything by themselves. Current ___ is the force behind the work done by electricity.
(amperage, or amps)
If you have to open a monitor, you must first ___ the high-voltage charge on it by using a ___.
discharge
high-voltage probe.
Do not use an ____ when discharging the monitor; doing so can lead to a fatal electric shock.
ESD strap
Working with LCD monitors or any device with a fluorescent or LCD backlight presents a unique safety challenge. These types of devices require an ___ which provides the high-voltage, high-frequency energy needed to power the backlight.
inverter,
The ____ is a small circuit board installed behind the LCD panel that takes power and converts (inverts) it for the backlight.
inverter
DC
If it’s an _____ printer, do not try to blow in the ink cartridge to clear a clogged opening—that is, unless you like the taste of ink.
inkjet
Some parts of a laser printer (such as the ____) will be damaged if you touch them.
EP cartridge
___ happens when two objects of dissimilar charge come into contact with one another.
ESD
For an antistatic wrist strap to work properly, the computer must be ____.
plugged in but turned off.
Never wear an ESD strap if you’re working inside a ____. If you wear one while working on the inside of these components, you increase the chance of getting a lethal shock.
monitor or inside a power supply.
Another preventive measure that you can take is to maintain the relative humidity at around ____ percent.
50
____ is an unwanted disturbance caused by electromagnetic radiation generated by another source.
EMI
Common sizes for Phillips-head screws are ___
000, 00, 0, 1, 2, and 3.
When dealing with Torx screws, the two most common sizes are ___ & ___.
T-10 and T-15
It is estimated that more than ___ percent of all of the lead (a poisonous substance) in landfills today comes from consumer electronics components.
25
Power sags without a complete loss, called a ___, are also very damaging to electrical components but oftentimes go unnoticed.
brownout
What is the purpose of using soap and water as a cleaning tool?
Cleaning external computer and monitor cases.
What is the purpose of using Demineralized water as a cleaning tool?
Cleaning keyboards or other devices that have contact points that are not metal.
What is the purpose of using Denatured Isopropyl Alcohol
Cleaning metal contacts, such as those on expansion cards.
There are five types of batteries most commonly associated with computers and handheld electronic devices. Name all 5.
alkaline, nickel cadmium (NiCd), nickel metal hydride (NiMH), lithium ion (Li-ion), and button cell.
___ is a popular format for rechargeable batteries.
Nickel cadmium
Laptop batteries are commonly made with ____
NiMH and lithium ion.
Nickel metal hydride (NiMH) and lithium ion (Li-ion)
