Electrostatic Discharge; Generating Static - Compaq PRESARIO Presario 1255 Maintenance And Service Manual

Models: 1255, 1256, 1260, 1262, 1266, 1267, 1272, 1273, 1274, and 1275
Before You Begin
Removal Sequence
Product Description
A sudden discharge of static electricity
from a finger or other conductor can
destroy static-sensitive devices or
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.
This table shows the different electrostatic voltage levels generated
Typical Electrostatic Voltages
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
Return to Removal & Replacement Procedures
Presario 1200 Series
Specifications
Troubleshooting
Pin Assignments
microcircuitry.

Generating Static

by various activities.
NOTE: 700 volts can degrade
a product.
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

Electrostatic Discharge

Relative Humidity
40%
15,000 V
5,000 V
800 V
700 V
4,000 V
5,000 V
20,000 V
11,000 V
Parts Catalog
Battery Operations
Index
55%
7,500 V
3,000 V
400 V
400 V
2,000 V
3,500 V
7,000 V
5,000 V