HP Workstation xw4100, Сервисное и техническое руководство

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hp workstation xw4100 service and technical reference guide 4–3
removal and replacement procedures
4.1.2 electrostatic discharge information
A sudden discharge of static electricity from your finger or other conductor can destroy
static-sensitive devices or microcircuitry. Often the spark is neither felt nor heard, but damage
occurs. An electronic device exposed to electrostatic discharge (ESD) may not appear to be
affected at all and can work perfectly throughout a normal cycle. The device may function
normally for a while, but it has been degraded in the internal layers, reducing its life expectancy.
Networks built into many integrated circuits provide some protection, but in many cases, the
discharge contains enough power to alter device parameters or melt silicon junctions.
generating static
The following table shows that:
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Different activities generate different amounts of static electricity.
■
Static electricity increases as humidity decreases.
preventing electrostatic damage to equipment
Many electronic components are sensitive to ESD. Circuitry design and structure determine the
degree of sensitivity. The following packaging and grounding precautions are necessary to
prevent damage to electric components and accessories.
■
To avoid hand contact, transport products in static-safe containers such as tubes, bags, or
boxes.
■
Protect all electrostatic parts and assemblies with conductive or approved containers or
packaging.
■
Keep electrostatic sensitive parts in their containers until they arrive at static-free stations.
■
Place items on a grounded surface before removing them from their container.
■
When handling or touching a sensitive component or assembly, ground yourself by touching
the chassis.
■
Avoid contact with pins, leads, or circuitry.
■
Place reusable electrostatic-sensitive parts from assemblies in protective packaging or
conductive foam.
relative humidity
event 55% 40% 10%
Walking across carpet
Walking across vinyl floor
Motions of bench worker 7,500 V
3,000 V
400 V 15,000 V
5,000 V
800 V 35,000 V
12,000 V
6,000 V
Removing bubble pack from PCB
Packing PCBs in foam-lined box 7,000 V
5,000 V 20,000 V
11,000 V 26,500 V
21,000 V
NOTE: 700 volts can degrade a product.