Dell Pro 14 Essential PV14255 handleiding

Laptop

Dell

140 pagina's

PDF beschikbaar

Handleiding

5. Disconnect all attached network devices and peripherals, such as keyboard, mouse, and monitor from your computer.

CAUTION: To disconnect a network cable, unplug the cable from your computer.

6. Remove any media card and optical disc from your computer, if applicable.

Safety precautions

This section details the primary steps to be followed before disassembling any device or component.

Observe the following safety precautions before any installation or break-fix procedures involving disassembly or reassembly:

● Turn off the computer and all attached peripherals.

● Disconnect the computer from AC power.

● Disconnect all network cables and peripherals from the computer.

● Use an ESD field service kit when working inside your computer to avoid electrostatic discharge (ESD) damage.

● Place the removed component on an anti-static mat after removing it from the computer.

● Press and hold the power button for 15 seconds to discharge the residual power in the system board.

Bonding

Bonding is a method for connecting two or more grounding conductors to the same electrical potential. This is done by using

a field service electrostatic discharge (ESD) kit. When connecting a bonding wire, ensure that it is connected to bare metal

and never to a painted or nonmetal surface. Ensure that the wrist strap is secure and in full contact with your skin. Remove all

jewelry, watches, bracelets, or rings before grounding yourself and the equipment.

Electrostatic discharge—ESD protection

ESD is a major concern when you handle electronic components, especially sensitive components such as expansion cards,

processors, memory modules, and system boards. A slight charge can damage circuits in ways that may not be obvious, such

as intermittent problems or a shortened product life span. As the industry pushes for lower power requirements and increased

density, ESD protection is an increasing concern.

Two recognized types of ESD damage are catastrophic and intermittent failures.

● 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.

NOTE:

You can protect against ESD and discharge static electricity from your body by touching a metal-grounded

object before you interact with anything electronic, for example, an unpainted metal surface on your computer’s I/O

panel. When connecting a peripheral (including handheld digital assistants) to your computer, you should always ground

both yourself and the peripheral before connecting it to the computer. In addition, as you work inside the computer,

periodically touch a metal-grounded object to remove any static charge that your body may have accumulated.

Working inside your computer 7

Bekijk gratis de handleiding van Dell Pro 14 Essential PV14255, 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.