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 might have occurred.
An electronic device exposed to ESD might not be affected at all and can work perfectly throughout a
normal cycle. Or the device might function normally for a while, then degrade in the internal layers,
reducing its life expectancy.
CAUTION:
To prevent damage to the computer when 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
36
Chapter 4 Removal and replacement procedures
Содержание G62 Series
Страница 4: ...iv Safety warning notice ...
Страница 6: ...vi MSG revision history ...
Страница 10: ...10 Recycling 114 Battery 114 Display 114 Index 121 x ...
Страница 27: ...Computer major components Computer major components 17 ...
Страница 34: ......
Страница 70: ...Reverse this procedure to install the speaker assembly 60 Chapter 4 Removal and replacement procedures ...
Страница 76: ...Reverse this procedure to install the USB board 66 Chapter 4 Removal and replacement procedures ...
Страница 121: ...Universal Serial Bus Pin Signal 1 5 VDC 2 Data 3 Data 4 Ground Universal Serial Bus 111 ...
Страница 130: ...22 Remove the LCD panel 23 Recycle the LCD panel and backlight 120 Chapter 10 Recycling ...
Страница 135: ......
