HP Chromebook x360 11 G2 EE Maintenance and Service Guide - Page 32

Electrostatic discharge information, Generating static electricity

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Electrostatic discharge information A sudden discharge of static electricity from your finger or other conductor can destroy static-sensitive devices or microcircuitry. Often the spark is neither felt nor heard, but damage occurs. An electronic device exposed to electrostatic discharge (ESD) may not appear to be affected at all and can work perfectly throughout a normal cycle. The device may function normally for a while, but it has been degraded in the internal layers, reducing its life expectancy. Networks built into many integrated circuits provide some protection, but in many cases, the discharge contains enough power to alter device parameters or melt silicon junctions. IMPORTANT: To prevent damage to the device 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. Generating static electricity Note the following: ● Different activities generate different amounts of static electricity. ● Static electricity increases as humidity decreases. Table 4-1 Static electricity occurrence based on activity and humidity Relative humidity Event 55% 40% Walking across carpet Walking across vinyl floor Motions of bench worker Removing DIPs from plastic tube 7,500 V 3,000 V 400 V 400 V 15,000 V 5,000 V 800 V 700 V Removing DIPs from vinyl tray Removing DIPs from Styrofoam Removing bubble pack from PCB Packing PCBs in foam-lined box 2,000 V 3,500 V 7,000 V 5,000 V 4,000 V 5,000 V 20,000 V 11,000 V Electronic components are multi-packaged inside plastic tubes, trays, or Styrofoam. 10% 35,000 V 12,000 V 6,000 V 2,000 V 11,500 V 14,500 V 26,500 V 21,000 V NOTE: As little as 700 volts can degrade a product. 22 Chapter 4 Removal and replacement procedures preliminary requirements

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Electrostatic discharge information
A sudden discharge of static electricity from your finger or other conductor can destroy static-sensitive devices
or microcircuitry. Often the spark is neither felt nor heard, but damage occurs. An electronic device exposed to
electrostatic discharge (ESD) may not appear to be affected at all and can work perfectly throughout a normal
cycle. The device may function normally for a while, but it has been degraded in the internal layers, reducing its
life expectancy.
Networks built into many integrated circuits provide some protection, but in many cases, the discharge contains
enough power to alter device parameters or melt silicon junctions.
IMPORTANT:
To prevent damage to the device 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.
Generating static electricity
Note the following:
●
Different activities generate different amounts of static electricity.
●
Static electricity increases as humidity decreases.
Table 4-1
Static electricity occurrence based on activity and humidity
Relative humidity
Event
55%
40%
10%
Walking across carpet
Walking across vinyl floor
Motions of bench worker
Removing DIPs from plastic tube
7,500 V
3,000 V
400 V
400 V
15,000 V
5,000 V
800 V
700 V
35,000 V
12,000 V
6,000 V
2,000 V
Removing DIPs from vinyl tray
Removing DIPs from Styrofoam
Removing bubble pack from PCB
Packing PCBs in foam-lined box
2,000 V
3,500 V
7,000 V
5,000 V
4,000 V
5,000 V
20,000 V
11,000 V
11,500 V
14,500 V
26,500 V
21,000 V
Electronic components are multi-packaged inside plastic tubes, trays, or Styrofoam.
NOTE:
As little as 700 volts can degrade a product.
22
Chapter 4
Removal and replacement procedures preliminary requirements