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
Preliminary replacement requirements
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Содержание Pavilion dv2
Страница 1: ...HP Pavilion dv2 Entertainment PC Maintenance and Service Guide ...
Страница 4: ...iv Safety warning notice ...
Страница 23: ...Service tag 15 ...
Страница 91: ...After either choice the computer restarts in Windows Using the Setup Utility 83 ...
Страница 111: ...Where used 2 screws that secure the power switch board to the base enclosure Phillips PM2 0x3 0 screw 103 ...
Страница 113: ...Where used 3 screws that secure the UMA heat sink to the bottom of the system board Phillips PM2 0 4 0 screw 105 ...
Страница 119: ...Where used 2 screws that secure the speaker module to the base component Phillips PM2 5 4 0 screw 111 ...
Страница 121: ...Where used 2 screws that secure the WLAN module to the bottom of the computer Phillips PM2 5x4 0 screw 113 ...
Страница 147: ......