Esd Precautions - Samsung SCX-1100 Service Manual

Precautions

1-3 ESD Precautions

Certain semiconductor devices can be easily damaged by
static electricity. Such components are commonly called
"Electrostatically Sensitive (ES) Devices", or ESDs.
Examples of typical ESDs are: integrated circuits, some field
effect transistors, and semiconductor "chip" components.
The techniques outlined below should be followed to help
reduce the incidence of component damage caused by sta-
tic electricity.
CAUTION:
Be sure no power is applied to the chassis or cir-
cuit, and observe all other safety precautions.
1. Immediately before handling a semiconductor compo-
nent or semiconductor-equipped assembly, drain off any
electrostatic charge on your body by touching a known
earth ground. Alternatively, employ a commercially avail-
able wrist strap device, which should be removed for your
personal safety reasons prior to applying power to the unit
under test.
2. After removing an electrical assembly equipped with
ESDs, place the assembly on a conductive surface, such
as aluminum or copper foil, or conductive foam, to pre-
vent electrostatic charge buildup in the vicinity of the
assembly.
3. Use only a grounded tip soldering iron to solder or desol-
der ESDs.
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4. Use only an "anti-static" solder removal device. Some sol-
der removal devices not classified as "anti-static" can
generate electrical charges sufficient to damage ESDs.
5. Do not use Freon-propelled chemicals. When sprayed,
these can generate electrical charges sufficient to dam-
age ESDs.
6. Do not remove a replacement ESD from its protective
packaging until immediately before installing it. Most
replacement ESDs are packaged with all leads shorted
together by conductive foam, aluminum foil, or a compa-
rable conductive material.
7. Immediately before removing the protective shorting
material from the leads of a replacement ESD, touch the
protective material to the chassis or circuit assembly into
which the device will be installed.
8. Maintain continuous electrical contact between the ESD
and the assembly into which it will be installed, until com-
pletely plugged or soldered into the circuit.
9. Minimize bodily motions when handling unpackaged
replacement ESDs. Normal motions, such as the brush-
ing together of clothing fabric and lifting one's foot from a
carpeted floor, can generate static electricity sufficient to
damage an ESD.
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