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United States January 3, 2003
Presario 1600 Series
Models: 1683, 1685, 1687, 1688, 1690, 1692, 1693, and 1694
Before You Begin Specifications Parts Catalog
Removal Sequence Troubleshooting Battery Operations
Product Description Pin Assignments
Index
Before You Begin
Electrostatic
Discharge
Service
Considerations
Preparation
for
Disassembly
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
Relative Humidity
Event 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.
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