Filter
Top Products
MAINTENANCE & SERVICE GUIDE
for Prosignia 150 Series Computer
Index Page Preface -or- Notice Specifications Battery Pack
Product Description Illustrated Parts Catalog Troubleshooting 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. Although, 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 shows how different activities generate static electricity and at different
electrostatic voltage levels.
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
NOTE: 700 volts can degrade a product.
Continue Preliminary pages:
Service Considerations
Cables & Connectors
Preparing Computer for Disassembly
Revised: September 16, 1999