Compaq 1800T, 1825 specifications Electrostatic Discharge, Generating Static

Page 41

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

Home Page Notice Preface Product Description

Troubleshooting

Illustrated Parts Catalog Removal & Replacement Procedures

Specifications

Pin Assignments Battery Pack Operations

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 how different activities generate static electricity 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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Contents
Page Page Preface SymbolsProduct Description Follow the Preliminary Steps TroubleshootingIllustrated Parts Catalog Removal Sequence Removal and Replacement ProceduresSerial Number Location Specifications Connector Pin Assignments Increasing Battery Pack Operating Time Battery Pack OperationsConditioning a Battery Pack Disposing of a Used Battery PackModels and Features Models and FeaturesHard Drive CD or DVD Drive Modem Kbps Data/Fax with PCI NetworkingIntegrated Speakers Controls and LightsControls Lights Internet Zone Buttons Lights Internet Zone Buttons LightsFront Bezel Components Front Bezel ComponentsLeft Side Components Left Side Components with Diskette DriveLeft Side Components with LS120 Drive Right Side Components Right Side ComponentsBottom Unit Bottom of UnitBack Connectors Back ConnectorsPort Replicator Components Port Replicator ComponentsPort Replicator Connectors Port Replicator Back ConnectorsPower Management for Windows Run Computer Checkup Preliminary StepsClearing the Power-on Password Running Post Power-On Self Test PostComputer Checkup Test Compaq DiagnosticsShipping Preparation Contacting Compaq SupportDiagnostic Error Codes Before Replacing Parts Troubleshooting Without DiagnosticsSolving Minor Problems Solving Power Problems Solving PC Card ProblemsSolving Printer Problems Solving TouchPad/Pointing Device ProblemsSystem Unit System UnitDescription Part Number BoardsBoards Boards Display Assembly Display AssemblyDescription Spare Part Number Mass Storage DevicesMass Storage Devices Description Quantity Miscellaneous Cables KitMiscellaneous Cables Kit Miscellaneous Hardware Kit Miscellaneous Hardware KitMiscellaneous Plastics Kit Miscellaneous Plastics KitMiscellaneous Parts Miscellaneous PartsDocumentation and Software Documentation and SoftwareGenerating Static Electrostatic DischargeReturn to Removal & Replacement Procedures Service ConsiderationsCables Cables and ConnectorsSelect the desired illustration Plastic PartsBack to Cables and Connectors Ribbon cable position for the hard drive Ribbon cable position for the DVD or CD drive Ribbon cable position for the diskette drive Ribbon cable position for the LS120 drive Back to Cables and Connectors Cable position for the modem Cable position for the Network Interface Card Ribbon cable position for the keyboard Preparing the Computer for Disassembly Removing the Battery Pack Removal & Replacement ProceduresPalmrest Cover with TouchPad Removing the Palmrest Cover with TouchPadRemoving Palmrest Cover with TouchPad Removal & Replacement Procedures Keyboard Removing the KeyboardStatus Panel Removing Status Panel AssemblyRemoving the Status Panel Assembly Removal & Replacement Procedures Return to Removal Replacement Procedures Removing Internet Button Board Removal & Replacement Procedures Removing the Heatspreader Removing the Network Interface Card Removing the Modem Removing Hard Drive Removing the Hard Drive Mounting Brackets DisqPlay Module Removing the DisqPlay ModuleRemoving the Processor Replacing the Processor DVD or CD Drive Removing the DVD or CD DriveRemoval & Replacement Procedures Return to Removal Replacement Procedures Remove the status panel assembly Removing Display Panel AssemblyRemoving the Display Panel Assembly Return to Removal & Replacement Procedures Upper CPU Cover Removing Upper CPU CoverFan Assembly Removing Fan AssemblyRemoving the Fan Assembly Removing the Diskette or LS120 Drive Return to Removal & Replacement Procedures Removing Battery Charger Board Remove the Upper CPU cover Removing the Speaker AssemblyRemoval Removing the System BoardRemove ten standoffs from the system board Removal & Replacement Procedures Remove four screws from the system board Before replacing Removing Memory Module Memory ModuleRemoving the Memory Module
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