Compaq XL118-XL127, XL115, XL101-XL113 manual Electrostatic Discharge, Generating Static

Presario 1200 Series

Models: XL101-XL113, XL115, XL118-XL127

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 seem to be affected at all and works perfectly throughout a normal cycle. Although it may function normally for a while, it may be degraded 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 activities that generate static electricity and the associated electrostatic voltage level.

Typical Electrostatic Voltages

Event

Relative Humidity

10% 40% 55%

Walking across carpet	35,000	V
Walking across vinyl floor	12,000	V
Motions of bench worker	6,000	V
Removing DIPS from plastic tubes	2,000	V
Removing DIPS from vinyl trays	11,500	V
Removing DIPS from styrofoam	14,500	V
Removing bubble pack from PCBs	26,000	V
Packing PCBs in foam-lined box	21,000	V

Note: 700 Volts can degrade a product.

15,000 V

5,000 V

800 V

700 V

4,000 V

5,000 V

20,000 V

11,000 V

7,500 V

3,000 V

400V

400V

2,000 V

3,500 V

7,000 V

5,000 V

2 REMOVAL SEQUENCE PRESARIO NOTEBOOK MAINTENANCE AND SERVICE GUIDE 1200XL SERIES