HP 7 1200, 7+ 1300 manual Grounding guidelines, Electrostatic discharge damage

Page 16

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 tablet 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.

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

 

 

 

 

10

Chapter 4 Removal and replacement preliminary requirements

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Contents Compaq 7+ 1300 Tablet and Compaq 7 1200 Tablet Product notice Software termsSafety warning notice Iv Safety warning notice Table of contents Page Product description Serviceability End user replaceable part Category Description Compaq 7+ Tablet Power requirementsOperating system External component identification External component identification Illustrated parts catalog Locating the serial number, product number, and model numberPower/volume button board includes cable Tablet major componentsComponent Spare part number Back cover MP rear-facing webcamera includes cableMiscellaneous parts Sequential part number listingSystem memory, and an 8.0-GB Nand flash drive Service considerations Removal and replacement preliminary requirementsTools required Grounding guidelines Electrostatic discharge damagePackaging and transporting guidelines Equipment guidelines Material Use Voltage protection levelRemoval and replacement procedures Tablet component replacement proceduresBack cover Description Spare part numberPage Battery Antenna board Speaker Rear-facing webcamera Microphone Front-facing webcamera Power/volume button board System board Page Page Specifications Statement of Volatility Select the File menu, then Save Changes and Exit Non-volatile memory usage CmosNon-volatile memory usage Statement of Volatility Questions and answers Power cord set requirements Requirements for all countriesRequirements for specific countries and regions Country/region Accredited agency Applicable note numberRequirements for specific countries and regions Recycling Index JacksTablet
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