HP Armada 1100 Armada 1100 Family of Personal Computers Maintenance and Servic - Page 67

Removal and Replacement Preliminaries, Introduction, Electrostatic Discharge

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Chapter 4 - Removal and Replacement Preliminaries Introduction This chapter provides general service information for the Compaq Armada 1100 Family of Personal Computers. Adherence to the procedures and precautions described in this chapter is essential for proper service. 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 or 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. Or 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 Table 4-1 shows how different activities generate static electricity and at different electrostatic voltage levels. Table 4-1. 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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Chapter 4 - Removal and Replacement Preliminaries
Introduction
This chapter provides general service information for the Compaq Armada
1100 Family of Personal Computers.
Adherence to the procedures and precautions described in this chapter is
essential for proper service.
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 or 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. Or 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
Table 4-1 shows how different activities generate static electricity and
at different electrostatic voltage levels.
Table 4-1. 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.
===========================================================================