Esd Precautions - Samsung SF-4500 Service Manual

Precautions

1-2 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 static electricity.
CAUTION: Be sure no power is applied to the
chassis or circuit, and observe all
other safety precautions.
1. Immediately before handling a semiconductor
component or semiconductor-equipped assembly,
drain off any electrostatic charge on your body by
touching a known earth ground. Alternatively,
employ a commercially available wrist strap
device, which should be removed for your per-
sonal 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 prevent electrostatic charge
buildup in the vicinity of the assembly.
3. Use only a grounded tip soldering iron to solder
or desolder ESDs.
1-3 Lithium Battery Precautions
1. Exercise caution when replacing a Lithium
battery. There could be a danger of explosion and
subsequent operator injury and/or
equipment damage if incorrectly installed.
2. Be sure to replace the battery with the same or
equivalent type recommended by the
manufacturer.
1-2
4. Use only an "anti-static" solder removal device
Some solder 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 suf-
ficient to damage 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
comparable 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 completely plugged or soldered
into the circuit.
9. Minimize bodily motions when handling unpack-
aged replacement ESDs. Normal motions, such as
the brushing together of
clothing fabric and lifting one's foot from a
carpeted floor, can generate static electricity
sufficient to damage an ESD.
3. Lithium batteries contain toxic substances and
should not be opened, crushed, or burned for dis-
posal.
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