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 area 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
Preliminary replacement requirements 37
Содержание Compaq 6910p
Страница 1: ...HP Compaq 6910p Notebook PC Maintenance and Service Guide ...
Страница 4: ...iv Safety warning notice ...
Страница 14: ...6 Chapter 1 Product description ...
Страница 24: ...16 Chapter 2 External component identification ...
Страница 26: ...Computer major components 18 Chapter 3 Illustrated parts catalog ...
Страница 98: ...90 Chapter 4 Removal and replacement procedures ...
Страница 122: ...Where used 2 screws that secure the system board to the base enclosure 114 Chapter 7 Screw listing ...
Страница 126: ...Where used 9 screws that secure the top cover to the computer 118 Chapter 7 Screw listing ...
Страница 136: ...128 Chapter 7 Screw listing ...
Страница 166: ...158 Index ...
Страница 167: ......
Страница 168: ......
