Handleiding
Je bekijkt pagina 27 van 99
● Catastrophic – Catastrophic failures represent approximately 20 percent of ESD-related failures. The damage causes
an immediate and complete loss of device functionality. An example of catastrophic failure is a memory module that has
received a static shock and immediately generates a "No POST/No Video" symptom with a beep code that is emitted for
missing or nonfunctional memory.
● Intermittent – Intermittent failures represent approximately 80 percent of ESD-related failures. The high rate of
intermittent failures means that most of the time when damage occurs, it is not immediately recognizable. The memory
module receives a static shock, but the tracing is merely weakened and does not immediately produce outward symptoms
that are related to the damage. The weakened trace may take weeks or months to melt, and in the meantime may cause
degradation of memory integrity, intermittent memory errors, and so on.
Intermittent failures that are also called latent or "walking wounded" are difficult to detect and troubleshoot.
Perform the following steps to prevent ESD damage:
● Use a wired ESD wrist strap that is properly grounded. Wireless anti-static straps do not provide adequate protection.
Touching the chassis before handling parts does not ensure adequate ESD protection on parts with increased sensitivity to
ESD damage.
● Handle all static-sensitive components in a static-safe area. If possible, use anti-static floor pads and workbench pads.
● When unpacking a static-sensitive component from its shipping carton, do not remove the component from the anti-static
packing material until you are ready to install the component. Before unwrapping the anti-static packaging, use the anti-
static wrist strap to discharge the static electricity from your body. For more information about the wrist strap and ESD
wrist strap tester, see Components of an ESD Field Service Kit.
● Before transporting a static-sensitive component, place it in an anti-static container or packaging.
ESD Field Service kit
The unmonitored field service kit is the most commonly used service kit. Each Field Service kit includes three main components:
anti-static mat, wrist strap, and bonding wire.
CAUTION:
It is critical to keep ESD-sensitive devices away from internal parts that are insulated and often
highly charged, such as plastic heat sink casings.
Working Environment
Before deploying the ESD Field Service kit, assess the situation at the customer location. For example, deploying the kit for a
server environment is different than for a desktop or laptop environment. Servers are typically installed in a rack within a data
center; desktops or laptops are typically placed on office desks or cubicles. Always look for a large open flat work area that
is free of clutter and large enough to deploy the ESD kit with additional space to accommodate the type of computer that is
being repaired. The workspace should also be free of insulators that can cause an ESD event. On the work area, insulators such
as styrofoam and other plastics should always be moved at least 12 inches or 30 centimeters away from sensitive parts before
physically handling any hardware components.
ESD Packaging
All ESD-sensitive devices must be shipped and received in static-safe packaging. Metal, static-shielded bags are preferred.
However, you should always return the damaged component using the same ESD bag and packaging that the new part arrived
in. The ESD bag should be folded over and taped shut and all the same foam packing material should be used in the original box
that the new part arrived in. ESD-sensitive devices should be removed from packaging only at an ESD-protected work surface,
and parts should never be placed on top of the ESD bag because only the inside of the bag is shielded. Always place parts in
your hand, on the anti-static mat, in the computer, or inside an ESD bag.
Components of an ESD Field Service kit
The components of an ESD Field Service kit are:
● Anti-Static Mat – The anti-static mat is dissipative and parts can be placed on it during service procedures. When using an
anti-static mat, your wrist strap should be snug and the bonding wire should be connected to the anti-static mat and to any
bare metal on the computer being worked on. Once deployed properly, service parts can be removed from the ESD bag and
placed directly on the anti-static mat. ESD-sensitive items are safe in your hand, on the anti-static mat, in the computer, or
inside an ESD bag.
● Wrist Strap and Bonding Wire – The wrist strap and bonding wire can be either directly connected between your wrist
and bare metal on the hardware if the anti-static mat is not required, or connect to the anti-static mat to protect hardware
Working inside your computer
27
Bekijk gratis de handleiding van Dell 14 Plus DB14250, stel vragen en lees de antwoorden op veelvoorkomende problemen, of gebruik onze assistent om sneller informatie in de handleiding te vinden of uitleg te krijgen over specifieke functies.
Productinformatie
| Merk | Dell |
| Model | 14 Plus DB14250 |
| Categorie | Laptop |
| Taal | Nederlands |
| Grootte | 38915 MB |
