HP COMPAQ DX2710 MT Technical Information download pdf (Page 31)

Service Reference Guide 483941-001 5–3

Identifying the Chassis, Routine Care, and Disassembly Preparation

5.2 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.

5.2.1 Generating Static

The following table shows that:

■ Different activities generate different amounts of static electricity.

■ Static electricity increases as humidity decreases.

✎

700 volts can degrade a product.

5.2.2 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.

■ Always be properly grounded when touching a sensitive component or assembly.

■ 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

1 2 ... 26 27 28 29 30 31 32 33 34 35 36 ... 106 107

Comments to this Manuals

No comments

HP COMPAQ DX2710 MT Technical Information Page 31

Comments to this Manuals

Related products and manuals for Motherboards HP COMPAQ DX2710 MT