Panasonic DVD-S35GD Service Manual

Contents

file:///C|/Documents and Settings/eDOK/ /DVD-S35xx/s0200000000x.html2 PREVENTION OF ELECTRO STATICDISCHARGE (ESD) TO ELECTROSTATICALLYSENSITIVE (ES) DEVICESTOP PREVIOUS NEXTSome semiconductor (solid state) devices can be damaged easily by static electricity. Such componentscommonly are called Electrostatically Sensitive (ES) Devices. Examples of typical ES devices areintegrated circuits and some field-effect transistorsand semiconductor"chip" components. The followingtechniques should be used to help reduce the incidence of component damage caused by electro staticdischarge (ESD).1. Immediately before handling any semiconductor component or semiconductor-equippedassembly, drain off any ESD on your body by touching a known earth ground. Alternatively,obtain and wear a commercially available dischargingESDwrist strap, which should be removedfor potential shock reasons prior to applying power to the unit under test.2. After removing an electrical assembly equipped with ES devices, place the assembly on aconductive surface such as alminum foil, to prevent electrostatic charge buildup or exposure ofthe assembly.3. Use only a grounded-tip soldering iron to solder or unsolder ES devices.4. Use only an anti-static solder removal device. Some solder removal devices not classified as"anti-static (ESD protected)" can generate electrical charge sufficient to damage ES devices.5. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damageES devices.6. Do not remove a replacement ES device from its protective package until immediately before youare ready to install it. (Most replacement ES devices are packaged with leads electrically shortedtogether by conductive foam, alminum foil or comparableconductivematerial).7. Immediately before removing the protective material from the leads of a replacement ES device,touch the protective material to the chassis or circuit assembly into which the device will beinstalled.Cautionfile:///C|/Documents and Settings/eDOK/ /DVD-S35xx/s0200000000x.html (1 of 2)03.10.2007 22:43:49