Removal And Replacement; Electrostatic Discharge - Compaq Presario Series Maintenance And Service Manual

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REMOVAL & REPLACEMENT

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. Or 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 below shows the different amounts of static electricity generated by different activities .
Event
Walking across carpet
Walking across vinyl floor
Motions of bench worker
Removing DIPS from plastic tubes
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Maintenance and Service Guide
Compaq Presario EZ2000 Series Computers
Jumper & Switch Information
(Return to Service
10%
35,000 V
12,000 V
6,000 V
2,000 V
Troubleshooting
Considerations)
Relative Humidity
40%
15,000 V
5,000 V
800 V
700 V
United States
Illustrated Parts Catalog
Specifications
55%
7,500 V
3,000 V
400 V
400 V