HP Presario 1600 Presario 1600XL Series Maintenance and Service Guide - Page 35

Electrostatic Discharge

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Presario 1600 Series Models: 1600T, 1600-XL140, 1600-XL141, 1600-XL142, 1600-XL143, 1600-XL144, 1600-XL145, 1600-XL146, 1600-XL147, and 1600-XL150 Before You Begin Specifications Removal Sequence Product Description Battery Operations Troubleshooting Parts Catalog Pin Assignments MSG Index Removal Sequence Electrostatic Discharge Service Considerations Cables and Connectors Preparing the Computer for Disassembly QuikDock Battery Pack Palmrest Cover with TouchPad Keyboard QuikDock Status/Internet Zone Cover Internet Button Board Heatspreader Modem Hard Drive DisqPlay Module Processor CD or DVD Drive Display Panel Assembly Upper CPU Cover Fan Assembly RTC Battery Diskette Drive Battery Charger Board Speaker Assembly System Board Memory Module Removal Sequence 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 seem to be affected at all and will work perfectly throughout a normal cycle. Although, it may function normally for a while, it may be degraded 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 activities that generate static electricity and the associated electrostatic voltage level. 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 Motions of bench worker Removing DIPS from plastic tubes 12,000 V 5,000 V 3,000 V 6,000 V 800 V 400 V 2,000 V 700 V 400 V Removing DIPS from vinyl trays Removing DIPS from Styrofoam Removing bubble pack from PCBs 11,500 V 4,000 V 2,000 V 14,500 V 5,000 V 3,500 V 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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Presario 1600 Series
Models: 1600T, 1600-XL140, 1600-XL141, 1600-XL142, 1600-XL143,
1600-XL144, 1600-XL145, 1600-XL146, 1600-XL147, and 1600-XL150
Before You Begin
Product Description
Parts Catalog
Specifications
Battery Operations
Pin Assignments
Removal Sequence
Troubleshooting
MSG Index
Removal
Sequence
Electrostatic
Discharge
Service
Considerations
Cables and
Connectors
Preparing the
Computer for
Disassembly
QuikDock
Battery Pack
Palmrest Cover
with TouchPad
Keyboard
QuikDock
Status/Internet
Zone Cover
Internet
Button Board
Heatspreader
Modem
Hard Drive
DisqPlay
Module
Processor
CD or DVD
Drive
Display Panel
Assembly
Upper CPU
Cover
Fan Assembly
RTC Battery
Diskette Drive
Battery
Charger Board
Speaker
Assembly
System Board
Memory
Module
Removal Sequence
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 seem to be affected at all and will
work perfectly throughout a normal cycle. Although, it may
function normally for a while, it may be degraded 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 activities that generate static electricity and
the associated electrostatic voltage level.
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.