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"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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