HP Chromebook 11MK G9 Education Edition Maintenance and Service Guide - Page 27
Electrostatic discharge information, Generating static electricity, If you remove a component
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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) might not appear to be affected at all and can work perfectly throughout a normal cycle. The device might 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 remove or install 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 Personal grounding methods and equipment on page 20. 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 Follow these static electricity guidelines. ● 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 7,500 V 15,000 V Walking across vinyl floor 3,000 V 5,000 V Motions of bench worker 400 V 800 V Removing DIPs (dual in-line packages) from plastic tube 400 V 700 V Removing DIPs from vinyl tray 2,000 V 4,000 V Removing DIPs from polystyrene foam 3,500 V 5,000 V Removing bubble pack from PCB (printed circuit board) 7,000 V 20,000 V Packing PCBs in foam-lined box 5,000 V 11,000 V Multiple electric components can be packaged together in plastic tubes, trays, or polystyrene foam. 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 V can degrade a product. ENWW Electrostatic discharge information 19