A user reports that his mechanical mouse is moving sporadically. You attempt to clean the ball, but the mouse still behaves erratically.
What should you try next?
1. Verify that the mouse is connected to the correct port.
2. >>Clean the rollers using rubbing alcohol and a cotton swab.
3. Install a new driver.
4. Change the battery.
Explanation : A mechanical mouse uses a ball that activates rollers when it is moved across a smooth surface. Both the ball and the rollers can gather dust and other debris from the environment. One of the symptoms of a dirty mouse is that the mouse pointer seems temporarily stuck or moves sporadically.
You do not need to change the battery. A mechanical mouse does not have a battery.
When a mechanical mouse moves erratically, the problem is due to a dirty ball and rollers. Installing a new driver will not correct that problem.
The mouse is not corrected to the wrong port. If the mouse were connected to the keyboard port, it would cause other symptoms, such as random characters appearing on the screen or the computer would beep at startup to indicate that a keyboard was not attached to the keyboard port. It would not function as a mouse, even erratically.
Objective: Personal Computer Components
Sunday, December 16, 2007
Safety & Environment: Spike vs Noise vs Brownout
Which hazard or hazards will a surge protector protect against?
1. Spike, noise, and brownout
2. >>Spike
3. Spike and Noise
4. Noise and Sag
Explanation : A surge protector will protect against surges, which are short periods of increased voltage and spikes, which are short surges.
A surge protector will not protect against noise, which is an AC signal that does not have a smooth variance.
A surge protector will not protect against a brownout, which is a short decrease in voltage level.
A sag is another name for brownout.
Objective: Safety and Environmental Issues
1. Spike, noise, and brownout
2. >>Spike
3. Spike and Noise
4. Noise and Sag
Explanation : A surge protector will protect against surges, which are short periods of increased voltage and spikes, which are short surges.
A surge protector will not protect against noise, which is an AC signal that does not have a smooth variance.
A surge protector will not protect against a brownout, which is a short decrease in voltage level.
A sag is another name for brownout.
Objective: Safety and Environmental Issues
Networks : Interference with wireless networks
Which of the following environmental conditions can prevent network transmission on an 802.11b network?
1. Walls that block line of sight
2. Bright lights
3. >>Electromagnetic interference
4. Humidity
Explanation : An 802.11b network is a wireless network that transmits data over radio waves. Therefore, it is subject to electromagnetic interference, such as electrical motors or other electrical devices. Some cordless phones have also been known to interfere with 802.11b transmissions.
Radio waves do not depend on line of sight. Therefore, walls that block the line of sight will not be a problem. However, some walls might contain material that prevents radio transmission.
Bright lights do not interfere with radio waves.
Humidity does not interfere with radio waves.
Objective: Networks
1. Walls that block line of sight
2. Bright lights
3. >>Electromagnetic interference
4. Humidity
Explanation : An 802.11b network is a wireless network that transmits data over radio waves. Therefore, it is subject to electromagnetic interference, such as electrical motors or other electrical devices. Some cordless phones have also been known to interfere with 802.11b transmissions.
Radio waves do not depend on line of sight. Therefore, walls that block the line of sight will not be a problem. However, some walls might contain material that prevents radio transmission.
Bright lights do not interfere with radio waves.
Humidity does not interfere with radio waves.
Objective: Networks
Safety & Environment: CRT vs Power Supply vs Battery vs Laser Printer
Which action should not be performed except by specially trained personnel due to the risk of electrical shock?
1. >>Opening a CRT monitor
2. Installing a new power supply in a desktop computer
3. Replacing a laptop battery
4. Cleaning the paper dust from a laser printer
Explanation : Only specially trained personnel should open a Cathode Ray Tube (CRT) monitor. A CRT monitor carries a strong electrical current that is not discharged when the monitor is unplugged. Only technicians who have been specially trained to work on CRT monitors should open the casing of one.
Although installing a power supply requires knowledge of how to connect the power supply to the components, doing so does not carry the risk of electrical shock as long as the computer is unplugged. However, you should never open the casing of a power supply because some components inside retain current strong enough to cause injury or death.
A laptop battery can be safely replaced by a user. The battery is made to be easily removable without the risk of electrical shock.
Cleaning the paper dust from a laser printer can be performed by a technician without special training. The best way to remove paper dust is with a can of compressed air.
Objective: Safety and Environmental Issues
1. >>Opening a CRT monitor
2. Installing a new power supply in a desktop computer
3. Replacing a laptop battery
4. Cleaning the paper dust from a laser printer
Explanation : Only specially trained personnel should open a Cathode Ray Tube (CRT) monitor. A CRT monitor carries a strong electrical current that is not discharged when the monitor is unplugged. Only technicians who have been specially trained to work on CRT monitors should open the casing of one.
Although installing a power supply requires knowledge of how to connect the power supply to the components, doing so does not carry the risk of electrical shock as long as the computer is unplugged. However, you should never open the casing of a power supply because some components inside retain current strong enough to cause injury or death.
A laptop battery can be safely replaced by a user. The battery is made to be easily removable without the risk of electrical shock.
Cleaning the paper dust from a laser printer can be performed by a technician without special training. The best way to remove paper dust is with a can of compressed air.
Objective: Safety and Environmental Issues
Printers and Scanners: Blue areas not printing
The Sales department uses a shared inkjet printer. Several users report that the color of print jobs is wrong. When you run a diagnostic print, you discover that blue areas are not printing. You replace the ink jet cartridge, but the problem still occurs.
What should you do?
1. >>Use the maintenance software provided by the manufacturer.
2. Clean the nozzles using denatured alcohol.
3. Use a low static vacuum to clean the printer.
4. Replace the printer driver.
Explanation : An inkjet printer exhibits print quality problems when the nozzles are dirty, when the print heads are dirty, or when the print heads are misaligned. These problems can be corrected in most inkjet printers by running the maintenance software provided by the manufacturer. The most likely problem when one color does not print is that the nozzle for that color has become clogged.
You should usually not use a vacuum on an inkjet printer.
You should not clean the nozzles using denatured alcohol. The maintenance software is the best way to clean the nozzles. Also, because inkjet printers use water-based ink, you should use water instead of denatured alcohol when you do need to manually clean ink off a component.
You should not replace the printer driver. It is unlikely that the printer driver is causing blue ink not to print. The printer driver is responsible for translating application and operating system commands to a language the printer can understand.
Objective: Printers and Scanners
What should you do?
1. >>Use the maintenance software provided by the manufacturer.
2. Clean the nozzles using denatured alcohol.
3. Use a low static vacuum to clean the printer.
4. Replace the printer driver.
Explanation : An inkjet printer exhibits print quality problems when the nozzles are dirty, when the print heads are dirty, or when the print heads are misaligned. These problems can be corrected in most inkjet printers by running the maintenance software provided by the manufacturer. The most likely problem when one color does not print is that the nozzle for that color has become clogged.
You should usually not use a vacuum on an inkjet printer.
You should not clean the nozzles using denatured alcohol. The maintenance software is the best way to clean the nozzles. Also, because inkjet printers use water-based ink, you should use water instead of denatured alcohol when you do need to manually clean ink off a component.
You should not replace the printer driver. It is unlikely that the printer driver is causing blue ink not to print. The printer driver is responsible for translating application and operating system commands to a language the printer can understand.
Objective: Printers and Scanners
Laptops and Hot Swappable Components
Which of the following is NOT hot swappable on a laptop computer?
1. USB hard disk
2. USB printer
3. PC card modem
4. >>Memory
Explanation : Memory is not a hot swappable component in a laptop computer. You need to unplug the laptop and remove the battery before installing memory.
A USB printer is a hot swappable component, as are most USB devices. However, you will probably need to install driver software.
PC card devices are hot swappable. PC card devices include modems, wireless adapters, and network cards.
A USB hard disk is hot swappable. It should be recognized as soon as it is plugged in.
Objective: Laptops and Portable Devices
1. USB hard disk
2. USB printer
3. PC card modem
4. >>Memory
Explanation : Memory is not a hot swappable component in a laptop computer. You need to unplug the laptop and remove the battery before installing memory.
A USB printer is a hot swappable component, as are most USB devices. However, you will probably need to install driver software.
PC card devices are hot swappable. PC card devices include modems, wireless adapters, and network cards.
A USB hard disk is hot swappable. It should be recognized as soon as it is plugged in.
Objective: Laptops and Portable Devices
Laptops: The Fn + Scroll Key
Sue reports that the keyboard on her laptop computer is not working. When she types the word "lion", the text "356n" appears.
What should you do?
1. >>Verify that the Fn key is not stuck.
2. Verify that the Caps lock key is not stuck.
3. Replace the keyboard.
4. Attach an external keyboard.
Explanation : You should verify that the Fn key is not stuck. You can lock the Fn key down by pressing the Fn+Scroll keys. Therefore, you should also check The Fn key is used to provide alternate keyboard functions for some keys on a laptop computer. For example, some alphabetic keys become numbers, allowing you to use the regular keyboard as a keypad.k whether the Scroll key is active.
To unlock a locked function key, press the Fn+Scroll keys again.
You should not verify that the Caps lock key is not stuck. The Caps lock key causes letters to be typed in uppercase even if the Shift key is not pressed.
There is no need to replace the keyboard. The keyboard is not malfunctioning. The problem is just a stuck key or user error.
There is no need to attach an external keyboard. The keyboard is not malfunctioning.
Objective: Laptops and Portable Devices
Sub Objective(s): Use tools, diagnostic procedures and troubleshooting techniques for laptops and portable devices.
Component replacement CompTIA A+ Certification: 220-602
What should you do?
1. >>Verify that the Fn key is not stuck.
2. Verify that the Caps lock key is not stuck.
3. Replace the keyboard.
4. Attach an external keyboard.
Explanation : You should verify that the Fn key is not stuck. You can lock the Fn key down by pressing the Fn+Scroll keys. Therefore, you should also check The Fn key is used to provide alternate keyboard functions for some keys on a laptop computer. For example, some alphabetic keys become numbers, allowing you to use the regular keyboard as a keypad.k whether the Scroll key is active.
To unlock a locked function key, press the Fn+Scroll keys again.
You should not verify that the Caps lock key is not stuck. The Caps lock key causes letters to be typed in uppercase even if the Shift key is not pressed.
There is no need to replace the keyboard. The keyboard is not malfunctioning. The problem is just a stuck key or user error.
There is no need to attach an external keyboard. The keyboard is not malfunctioning.
Objective: Laptops and Portable Devices
Sub Objective(s): Use tools, diagnostic procedures and troubleshooting techniques for laptops and portable devices.
Component replacement CompTIA A+ Certification: 220-602
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