Electrostatic Discharge; Generating Static - Compaq 1200US - Presario - Celeron 800 MHz Maintenance And Service Manual

Models: 1246, 1247, 1277, 1278, and 1279
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Removal and Replacement Procedures

Electrostatic Discharge

CAUTION: 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.
The device may function normally for a while, then degrade in the internal layers. This
reduces the device's life expectancy.
Networks built into many integrated circuits provide some protection
from discharges of static electricity, but in many cases the discharge
contains enough power to alter device parameters or melt silicon
junctions.

Generating Static

The following table shows how different activities generate static electricity at
different electrostatic voltage levels.
Event
Walking across carpet
Walking across vinyl floor
Motions of bench worker
Removing DIPS from plastic tubes
Removing DIPS from vinyl trays
Removing DIPS from Styrofoam
Removing bubble pack from PCBs
Packing PCBs in foam-lined box
NOTE: 700 volts can degrade a product.
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Maintenance & Service Guide
Presario 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
11,500 V
14,500 V
26,000 V
21,000 V
| Troubleshooting
| Specifications
40% 55%
15,000 V 7,500 V
5,000 V 3,000 V
800 V 400 V
700 V 400 V
4,000 V 2,000 V
5,000 V 3,500 V
20,000 V 7,000 V
11,000 V 5,000 V