Panasonic TX-17LX2 Service Manual

Contents

Panasonic TX-17LX2 Service Manual Manual pdf 4 page image

32 Prevention of Electro Static Discharge (ESD) to Electrostatically Sensitive(ES) DevicesSome semiconductor (solid state) devices can be damaged easily by static electricity. Suchcomponents commonly are called Electrostatically Sensitive (ES) Devices. Examples of typicalES devices are integrated circuits and some field-effect transistors and semiconductor “chip”components. The following techniques should be used to help reduce the incidence ofcomponent damage caused by electro static discharge(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 discharging ESD wrist strap, which should beremoved for 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 exposureof the 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 chages sufficient todamage ES devices.6. Do not remove a replacement ES device from its protective package until immediately beforeyou are ready to install it.(Most replacement ES devices are packaged with leadseelectrically shorted together by conductive foam, alminum foil or comparable conductivematerial).7. Immediately before removing the protective material from the leads of a replacement ESdevice, touch the protective material to the chassis or circuit assembly into which the devicewill be installed.CautionBe sure no power is applied to the chassis or circuit, and observe all other safetyprecautions.8. Minimize bodily motions when handling unpackaged replacement ES devices. (Otherwisehamless motion such as the brushing together of your clothes fabric or the lifting of your footfrom a carpeted floor can generate static electricity (ESD) sufficient to damage an ESdevice).There are special components used in this epuipment which are imporant for safety.These parts are maked by in the schematic diagrams, Exploded Views and replacement parts list. lt isessential that these critical parts should be replaced with manufacturer’s specified parts to prevent shock,fire, or other hazards. Do not modify the original design without permission of manufacturer.IMPORTANT SAFETY NOTICE