HP TM2 manual Grounding guidelines, Electrostatic discharge damage

Page 37

Grounding guidelines

Electrostatic discharge damage

Electronic components are sensitive to electrostatic discharge (ESD). Circuitry design and structure determine the degree of sensitivity. Networks built into many integrated circuits provide some protection, but in many cases, ESD contains enough power to alter device parameters or melt silicon junctions.

A discharge of static electricity from a finger or other conductor can destroy static-sensitive devices or microcircuitry. Even if the spark is neither felt nor heard, damage may have occurred.

An electronic device exposed to ESD may not be affected at all and can work perfectly throughout a normal cycle. Or the device may function normally for a while, then degrade in the internal layers, reducing its life expectancy.

CAUTION: To prevent damage to the computer when you are removing or installing internal components, observe these precautions:

Keep components in their electrostatic-safe containers until you are ready to install them.

Use nonmagnetic tools.

Before touching an electronic component, discharge static electricity by using the guidelines described in this section.

Avoid touching pins, leads, and circuitry. Handle electronic components as little as possible.

If you remove a component, place it in an electrostatic-safe container.

The following table shows how humidity affects the electrostatic voltage levels generated by different activities.

CAUTION: A product can be degraded by as little as 700 V.

Typical electrostatic voltage levels

 

 

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 tube

2,000 V

700 V

400 V

 

 

 

 

Removing DIPS from vinyl tray

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 PCB

26,500 V

20,000 V

7,000 V

 

 

 

 

Packing PCBs in foam-lined box

21,000 V

11,000 V

5,000 V

 

 

 

 

ENWW

Preliminary replacement requirements 29

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Contents HP TouchSmart tm2 Notebook PC Page Safety warning notice Iv Safety warning notice Table of contents Setup Utility Bios Power cord set requirements Viii Product description Optical drives Category DescriptionWebcam Diskette driveOperating system Preinstalled Power requirementsServiceability End-user replaceable parts DockingTop components External component identificationDisplay components Component FunctionFn key KeysComponent Description LightsTouchPad components Rear components Front componentsLeft-side components Right-side components Power OptionsControl Panel System and Security Right-side components Bottom components Illustrated parts catalog Service tagIllustrated parts catalog Computer major components Display assembly subcomponents not illustrated Power connector and cable Bluetooth module 537921-001592964-001 FanWlan module Description Spare part numberEnww Plastics Kit Mass storage devices Miscellaneous parts Spare part Description Number Sequential part number listingZambia, and Zimbabwe Bracket, and cable Thermal material Preliminary replacement requirements Removal and replacement proceduresService considerations Tools requiredCables and connectors Electrostatic discharge damage Grounding guidelinesPackaging and transporting guidelines Material Use Voltage protection level Equipment guidelinesService tag Component replacement proceduresComponent replacement procedures Computer feet Battery Description Spare part number Pen 593028-001 PenHard drive Enww Enww Memory module Enww Enww Wlan module Enww Enww Enww RTC battery Top cover Enww Country or region Spare part number KeyboardEnww Pen holder and eject assembly Description Spare part number Bluetooth module 537921-001 Bluetooth modulePower switch board Display assembly Enww Enww Enww FSB, 3-MB L2 cache, 18-W System boardEnww Enww Power connector and cable Description Spare part number Fan 592970-001 FanHeat sink Enww Enww Reverse this procedure to install the heat sink Starting Setup Utility Setup Utility BiosChanging the language of Setup Utility Using Setup UtilityNavigating and selecting in Setup Utility Display system information Restoring default settings in Setup UtilityExiting Setup Utility Setup Utility menusMain menu Security menuDiagnostics menu System Configuration menuDetermining the Bios Updating the BiosDownloading a Bios update Enww Computer specifications SpecificationsInch display specifications Hard drive specifications Applicable disc Read Write Access timeCache buffer Data transfer rate RAM Backup and recovery Page Backing up your information Using system restore points Using Windows Backup and RestoreRecovering from the recovery discs Performing a recoverySelect Start All Programs Recovery Manager Recovery Manager Pin Signal Connector pin assignmentsAudio-in microphone Audio-out headphoneExternal monitor Hdmi Universal Serial Bus RJ-45 networkRequirements for all countries Power cord set requirementsCountry/region Accredited agency Applicable note number Requirements for specific countries and regionsRecycling BatteryDisplay Display Enww Enww Enww Enww Index USB Chipset