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
