Service Manuals, User Guides, Schematic Diagrams or docs for : . Rare and Ancient Equipment Rolsen DVD Сервисные мануалы RDV-620 1-2

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1-2 ESD Precautions

Electrostatically Sensitive Devices(ESD)

Some semiconductor (solid state) devices can be             (5) Do not use freon-propelled chemicals. These can
damaged easily by static electricity.                           generate electrical charges sufficient to damage ESD
Such components commonly are called Electros-                   devices.
tatically Sensitive Devices (ESD). Examples of
typical ESD devices are integrated circuits and some        (6) Do not remove a replacement ESD device from its
field-effect transistors and semiconductor chip                 protective package until immediately before you are
components. The following techniques should be used             ready to install it. (Most replacement ESD devices
to help reduce the incidence of component damage                are packaged with leads electrically shorted together
caused by static electricity.                                   by conductive foam, aluminum foil or comparable
                                                                conductive materials).
(1) Immediately before handling any semiconductor
    component or semiconductor-equipped assembly,           (7) Immediately before removing the protective
    drain off any electrostatic charge on your body by          materials from the leads of a replacement ESD
    touching a known earth ground. Alternatively, obtain        device, touch the protective material to the chassis or
    and wear a commercially available discharging wrist         circuit assembly into which the device will be
    strap device, which should be removed for potential         installed.
    shock reasons prior to applying power to the unit
    under test.                                                 CAUTION: Be sure no power is applied to the
                                                                chassis or circuit, and observe all other safety
(2) After removing an electrical assembly equipped with         precautions.
    ESD devices, place the assembly on a conductive
    surface such as aluminum foil, to prevent elec-         (8) Minimize bodily motions when handling
    trostatic charge buildup or exposure of the assembly.       unpackaged replacement ESD devices.
                                                                (Otherwise harmless motion such as the brushing
(3) Use only a grounded-tip soldering iron to solder or         together of your clothes fabric or the lifting of your
    unsolder ESD devices.                                       foot from a carpeted floor can generate static
                                                                electricity sufficient to damage an ESD device).
(4) Use only an anti-static solder removal devices.
     Some solder removal devices not classified as "anti-
    static" can generate electrical charges sufficient to
    damage ESD devices.




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