Electrostatic Discharge; Generating Static - Compaq Presario 1905 Maintenance & Service Manual

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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.
Event
Walking across carpet
Walking across vinyl floor
Motions of bench worker
Removing DIPS from plastic tubes
file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20check...201915%201919%201920%201922%201925/electro.html (1 of 2)6/27/2004 5:05:21 AM
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Maintenance & Service Guide
Presario 1900 Series
| Notice | Preface
| Removal & Replacement Procedures
Pin Assignments
Typical Electrostatic Voltages
| Product Description
| Battery Pack Operations
Relative Humidity
10%
35,000 V
12,000 V
6,000 V
2,000 V
United States June 27, 2004
| Troubleshooting
| Specifications
40% 55%
15,000 V 7,500 V
5,000 V 3,000 V
800 V 400 V
700 V 400 V