Presario 1400 Series
Model XL240, XL241, XL242, XL244, XL245, XL246, XL247, XL250, XL340, XL341, XL342, XL343, XL344, XL345, XL346, XL350, XL352, XL355, and XL356
Electrostatic Discharge
A sudden discharge of static electricity from a finger or other conductor can destroy
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.
Generating Static
The table below shows activities that generate static electricity and their associated level of electrostatic voltage.
Typical Electrostatic Voltages
Event |
| Relative Humidity | |
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| 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 tubes | 2,000 V | 700 V | 400 V |
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Removing DIPS from vinyl trays | 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 PCBs | 26,000 V | 20,000 V | 7,000 V |
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Packing PCBs in | 21,000 V | 11,000 V | 5,000 V |
Note: 700 volts can degrade a product.
PRESARIO NOTEBOOK MAINTENANCE AND SERVICE GUIDE 1400 SERIES | REMOVAL SEQUENCE 17 |