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Compaq.com - Compaq Presario 1200 Series Maintenance and Service Guide - Model 1245
United States December 9, 2002
Maintenance & Service Guide
Presario 1200 Series
Model: 1245
| Home Page | Notice | Preface | Product Description | Troubleshooting
Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications
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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 an 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, it is possible for the exposed device's internal
layers to degrade, reducing its life expectancy considerably.
● Networks built into multiple integrated circuits provide some
protection, but in many cases, the discharge can contain
enough power to alter device parameters and melt silicon
junctions.
Generating Static
This table shows the different electrostatic voltage levels generated
by various activities.
NOTE: 700 volts can degrade a
product.
Typical Electrostatic Voltages
Event
Relative Humidity
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
Removing DIPS from vinyl
trays
11,500 V 4,000 V 2,000 V
Removing DIPS from
Styrofoam
14,500 V 5,000 V 3,500 V
Removing bubble pack
from PCBs
26,000 V 20,000 V 7,000 V
Packing PCBs in foam-lined
box
21,000 V 11,000 V 5,000 V
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