Panasonic DVD-RV26 Service Manual

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DEVICESSome semiconductor (solid state) devices can be damaged easily by static electricity. Suchcomponents commonly are called Electrostatically Sensitive (ES) Devices. Examples of typical ESdevices are integrated circuits and some field-effect transistorsand semiconductor "chip"components. The following techniques should be used to help reduce the incidence of componentdamage caused by electro static discharge (ESD).1. Immediately before handling any semiconductor component orsemiconductor-equipped assembly, drain off any ESD on your body bytouching a known earth ground. Alternatively, obtain and wear acommercially available dischargingESD wrist strap, which should beremoved for potential shock reasons prior to applying power to theunit under test.2. After removing an electrical assembly equipped with ES devices, placethe assembly on a conductive surface such as alminum foil, to preventelectrostatic charge buildup or exposure of the assembly.3. Use only a grounded-tip soldering iron to solder or unsolder ESdevices.4. Use only an anti-static solder removal device. Some solder removaldevices not classified as "anti-static (ESD protected)" can generateelectrical charge sufficient to damage ES devices.5. Do not use freon-propelled chemicals. These can generate electricalcharges sufficient to damage ES devices.6. Do not remove a replacement ES device from its protective packageuntil immediately before you are ready to install it. (Most replacementES devices are packaged with leads electrically shorted together byconductive foam, alminum foil or comparableconductive material).7. Immediately before removing the protective material from the leads ofa replacement ES device, touch the protective material to the chassisor circuit assembly into which the device will be installed.CautionBe sure no power is applied to the chassis or circuit, and observe allother safety precautions.8. Minimize bodily motions when handling unpackaged replacement ESdevices. (Otherwise hamless motion such as the brushing together ofyour clothes fabric or the lifting of your foot from a carpeted floor cangenerate static electricity (ESD) sufficient todamage an ES device).5