Ch 7 ESD Precautions Test Quiz

It is important to ground yourself and the equipment when working on ESD-sensitive circuits to prevent any static electricity from damaging the components. Using a grounded conductive workbench mat and a grounding wrist strap helps to dissipate any static charges that may build up on your body. The ESD mat and snap fastener with lead to ground provide a direct path for the static electricity to flow away from the equipment, further protecting the sensitive circuits. Therefore, the statement is true.

When working at a customer site, it is important to take precautions to avoid ESD (Electrostatic Discharge) damage. This includes making the work area ESD-safe by using a workbench mat and a wrist strap. Using mats that fold up can be convenient for travel. It is also important to ensure that everything is properly grounded and to never set parts on the floor. This is necessary to prevent any potential ESD damage that could occur during the work process.

ESD stands for electrostatic discharge. Electrostatic discharge refers to the sudden flow of electricity between two electrically charged objects caused by contact, electrical short, or dielectric breakdown. It can cause damage to electronic devices and circuits if not properly controlled. This term is commonly used in the context of handling and protecting electronic components to prevent damage from static electricity.

To reduce the risk of ESD (electrostatic discharge) damage, it is important to ground yourself. This means that you need to discharge any built-up static electricity in your body before coming into contact with sensitive electronic equipment. By grounding yourself, you are ensuring that any potential static charges are safely dissipated, preventing them from damaging the equipment. This can be done by touching a grounded metal object, such as a metal surface or a grounding strap, before handling the equipment.

The explanation for the given answer "True" is that keeping the humidity in the service area between 70% and 90% and using an ion generator can help reduce charge levels in the environment. While high humidity does not completely eliminate charge levels, it does help in reducing them. Therefore, it is recommended to keep the humidity within the specified range and use an ion generator to maintain a suitable environment.

The statement explains that wearing polyester clothing or bringing plastic, vinyl, or Styrofoam into the work environment should be avoided because these nonconductors create an electrostatic field that cannot be completely eliminated. Therefore, the statement is true.

ESD mats are designed to dissipate static electricity and prevent damage to sensitive electronic equipment. Over time, these mats can accumulate dirt, dust, and other contaminants that can interfere with their ability to ground equipment properly. Therefore, it is important to clean them regularly to maintain their effectiveness. Using a cleaner specifically designed for ESD mats ensures that the cleaning process does not damage the mats or compromise their ability to ground equipment. By cleaning the mats at least once a week with the appropriate cleaner, you can ensure that they continue to provide the necessary protection against static electricity. Therefore, the statement "If you have ESD mats in your service area, it is important to clean them at least once a week" is true.

ESD, or electrostatic discharge, can cause damage to sensitive chips in a computer. When a static charge is discharged through a computer component, it can cause a sudden surge of electricity that exceeds the chip's tolerance, leading to permanent damage. This can result in malfunctions or complete failure of the affected chip, impacting the overall performance and functionality of the computer. Therefore, it is crucial to handle computer components with proper ESD precautions to prevent damage to these sensitive chips.

When working on plugged-in equipment, discharging a cathode-ray tube (CRT), working on an unplugged CRT that has not been discharged, or performing live adjustments, it is important not to be grounded. Being grounded in these situations can result in electric shock or damage to the equipment.

To reduce the risk of ESD damage, it is recommended to handle all circuit boards by the edges. This is because the edges of the circuit board are less likely to have exposed circuitry or sensitive components. By holding the board by the edges, the risk of accidentally touching and damaging any delicate parts or causing electrostatic discharge is minimized.

The correct answer is "Myth". This means that the statement "You do not have to be hardwired to ground to practice correct ESD precautions" is not true. The explanation provided states that there are products claiming to ground you without direct connections to ground, but these "wireless" solutions have not been proven. Therefore, the correct way to practice correct ESD precautions is by using a grounded wrist strap or heel strap.

When working on a circuit board, it is important not to touch anyone who is also working on it in order to reduce the risk of ESD (Electrostatic Discharge) damage. ESD can occur when there is a sudden flow of electricity between two objects with different charges, and this discharge can damage electronic components on the circuit board. By avoiding physical contact with someone working on a circuit board, the risk of ESD damage is minimized.

To reduce the risk of ESD (Electrostatic Discharge) damage, it is recommended to use static-shielding bags. These bags are specially designed to protect electronic components and devices from static electricity. The bags have a conductive layer that prevents the buildup of static charge and safely dissipates any existing charge. By storing sensitive electronic items in static-shielding bags, the risk of ESD damage is minimized, ensuring the longevity and proper functioning of the devices.

Plastic storage bags are not one of the four basic pieces of equipment needed to reduce the risk of damage from ESD. Grounded mat, wrist strap, ground cord with alligator clips, and ground polarity tester are all essential in reducing the risk of damage from ESD. However, plastic storage bags do not provide any grounding or protection against ESD and are therefore not considered as one of the necessary equipment.

ESD-preventive equipment reduces the risk of damage from ESD by eliminating electrostatic charge. This means that the equipment is designed to remove or neutralize any built-up electrostatic charge, preventing it from causing damage to sensitive electronic components. By eliminating the charge, the equipment ensures that there is no potential for a sudden discharge that could harm the devices. This is crucial in industries where electrostatic discharge can cause significant damage or malfunction to electronic equipment.

Discharging a CRT (Cathode Ray Tube) involves releasing the stored electrical charge in the monitor to prevent electric shock. When discharging a CRT, it is important not to wear a grounded wrist strap because it can create a path for the electrical charge to flow through the body, potentially causing harm. Therefore, it is recommended to remove any conductive materials, including wrist straps, before discharging a CRT to ensure personal safety.

The given answer is "Myth". The explanation for this is that Apple does take ESD precautions seriously and they do provide guidelines for customers to follow when replacing DIY parts. However, it is true that customers replace far fewer parts than service technicians and it may be more difficult to train customers in the best ESD techniques. Therefore, Apple asks customers to practice a less effective procedure of touching metal before replacing DIY parts, which is still better than not taking any precautions at all.

Most components have some circuitry and can be sensitive to electrostatic discharge (ESD). This includes cables and other components that contain integrated circuits (ICs). Therefore, it is not true that only RAM and logic boards require ESD precautions. It is important to take ESD precautions whenever opening up a system to prevent damage to sensitive components.

The given explanation suggests that the statement "I don't have time to be tied down with wrist straps and mats" is a myth. It states that mishandling components can lead to the creation of DOA (Dead on Arrival) parts, which in turn can slow down repairs and lead to customer dissatisfaction. It also mentions that work areas can be set up using heel straps instead of wrist straps, allowing for hands-free work. Therefore, the explanation implies that it is important to use wrist straps and mats to prevent mishandling and ensure efficient repairs.

An ESD-compliant workstation requires several pieces of equipment to prevent ESD damage. A workbench mat with a ground cord is necessary to provide a static-safe surface for working on sensitive components. A wrist strap with a ground cord is essential for grounding the person working at the workstation, preventing the buildup of static electricity. An equipment ground cord with alligator clips is needed to ground any equipment or devices being used. Lastly, a ground polarity tester is necessary to ensure that the workstation's grounding system is functioning properly. Therefore, all of the above equipment is needed for an ESD-compliant workstation.

The correct answer includes four types of materials: polyester, plastic, vinyl, and styrofoam. These materials are all nonconductors, meaning they do not easily allow the flow of electricity. The statement advises against wearing or bringing these materials into the work environment because they create an electrostatic field that cannot be completely eliminated. This electrostatic field can potentially interfere with electronic equipment or cause damage.

The given answer suggests that the statement "I don't use ESD precautions and have never had a problem" is a myth. The explanation states that even if someone has not experienced immediate problems or performance issues, they may still be damaging parts in ways that are not immediately noticeable. Apple's testing has consistently shown that mishandling components and systems can lead to IC (integrated circuit) damage. Therefore, it is important to use ESD precautions to prevent potential damage.

Plastics, polyester clothing, and Styrofoam should be kept away from an ESD-safe workbench because they are all materials that can generate static electricity. Static electricity can damage sensitive electronic components, so it is important to avoid these materials in an ESD-safe environment. Foam rubber, ion generators, and alligator clips do not generate static electricity and can be safely used on an ESD-safe workbench.

Metal surfaces can hold a static charge that can damage sensitive electronic parts. Therefore, it is important to never place components on any metal surface. Instead, it is recommended to use antistatic, conductive, or foam rubber mats to prevent any potential damage.

These guidelines suggest several measures to prevent the buildup of static electricity and protect electronic components from damage. Handling components by their edges helps minimize contact with sensitive parts and reduces the risk of static discharge. Grounding yourself is important to equalize any static charge between your body and the equipment, except when the unit is plugged in as it may pose a risk. Avoid placing components on metal surfaces to prevent potential static buildup. It is important not to touch anyone while grounded to avoid transferring any static charge. Using static-shielding bags for storing components helps protect them from external static charges. Keeping materials like polyester, vinyl, and styrofoam away from components is important as they can generate static electricity. Maintaining humidity levels between 70-90% helps dissipate static charges. If possible, using an ion generator can help neutralize static charges in the environment. Lastly, regular cleaning of ESD mats helps maintain their effectiveness in dissipating static charges.

The correct answer is "static shielding, static shielding." This means that the recommended type of storage bags for boards and assemblies with circuit boards on them is static shielding bags. These bags are designed to protect electronic components from electrostatic discharge (ESD) damage. It is important to put the board in a static shielding bag before moving it to a storage place to ensure its safety. Additionally, Apple replacement modules should be kept in their ESD-safe packaging until they are needed to prevent any potential damage from static electricity.

It is important not to touch anyone who is working on ESD sensitive circuits or circuit boards of any kind. This is because when you touch someone who is properly grounded, your "zap" or body charge may not cause any damage to the sensitive circuits or circuit boards, but it is still recommended to keep your own body charge away from other technicians to ensure their safety and prevent any potential damage to the electronic components.