Maintenance and Service Guide
Compaq Presario EZ2000 Series Computers
Product Description Troubleshooting Illustrated Parts Catalog
Home Removal & Replacement Jumper & Switch Information Specifications
REMOVAL & REPLACEMENT
Electrostatic Discharge (Return to Service Considerations)
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 .
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
Removing DIPS from plastic tubes 2,000 V 700 V
400 V
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