"Compaq.com - Compaq Presario Series Maintenance and Service Guide - Models: 1683, 1685, 1687, 1688, and 1690

 

United States June 27, 2004

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Maintenance & Service Guide for Presario 1600 Series

(Models 1683-1694)

Home Page Notice Preface Product Description Troubleshooting

Illustrated Parts Catalog

Removal & Replacement Procedures Specifications Pin Assignments Battery

Pack Operations

Removal and Replacement Procedures

Electrostatic Discharge

A sudden discharge of static electricity from a 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 be affected at all and will work perfectly throughout a normal cycle. Although, it may function normally for a while, then degrade 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 table shows how different activities generate static electricity and at different electrostatic voltage levels.

Typical Electrostatic Voltages

 

 

Relative Humidity

 

 

 

 

 

 

 

 

 

Event

 

10%

 

40%

 

55%

 

 

 

 

 

 

 

Walking across carpet

 

35,000 V

 

15,000 V

 

7,500 V

 

 

 

 

 

 

 

Walking across vinyl floor

 

12,000 V

 

5,000 V

 

3,000 V

 

 

 

 

 

 

 

Motions of bench worker

 

6,000 V

 

800 V

 

400 V

 

 

 

 

 

 

 

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