CAUTION: To prevent damage to the computer when you are removing or installing internal components, observe these precautions:
Keep components in their
Use nonmagnetic tools.
Before touching an electronic component, discharge static electricity by using the guidelines described in this section.
Avoid touching pins, leads, and pointing stick circuitry. Handle electronic components as little as possible.
If you remove a component, place it in an
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
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| Relative humidity |
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Event | 10% | 40% | 55% |
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Walking across carpet | 35,000 V | 15,000 V | 7,500 V |
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Walking across vinyl floor | 12,000 V | 5,000 V | 3,000 V |
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Motions of bench worker | 6,000 V | 800 V | 400 V |
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Removing DIPS from plastic tube | 2,000 V | 700 V | 400 V |
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Removing DIPS from vinyl tray | 11,500 V | 4,000 V | 2,000 V |
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Removing DIPS from Styrofoam | 14,500 V | 5,000 V | 3,500 V |
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Removing bubble pack from PCB | 26,500 V | 20,000 V | 7,000 V |
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Packing PCBs in | 21,000 V | 11,000 V | 5,000 V |
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Packaging and transporting guidelines
Follow these grounding guidelines when packaging and transporting equipment:
●To avoid hand and pointing stick contact, transport products in
●Protect
●Keep
●Place items on a grounded surface before removing items from their containers.
●Always be properly grounded when touching a component or assembly.
Grounding guidelines | 43 |