Esd Precautions; Super Capacitor Or Lithium Battery Precautions - Samsung ML-920 Service Manual

Precautions

1-2 ESD Precautions

1. 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" compo-
nents.
The techniques outlined below should be fol-
lowed 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 pre-
cautions.
2. Immediately before handling a semiconductor
component or semiconductor-equipped assem-
bly, drain off any electrostatic charge on your
body by touching a known earth ground. Alterna-
tively, employ a commercially available wrist
strap device, which should be removed for your
personal safety reasons prior to applying power
to the unit under test.
3. After removing an electrical assembly equipped
with ESDs, place the assembly on a conductive
surface, such as aluminum or copper foil, or con-
ductive foam, to prevent electrostatic charge
buildup in the vicinity of the assembly.

1-3 Super Capacitor or Lithium Battery Precautions

1. Exercise caution when replacing a super capaci-
tor or 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 manufac-
turer.
1-2
4. Use only a grounded tip soldering iron to solder
or desolder ESDs.
Use only an "anti-static" solder removal device.
Some solder removal devices not classified as
"anti-static" can generate electrical charges suffi-
cient to damage ESDs.
5. Do not use Freon-propelled chemicals. When
sprayed, these can generate electrical charges
sufficient to damage ESDs.
6. Do not remove a replacement ESD from its pro-
tective packaging until immediately before install-
ing 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 replace-
ment 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 gener-
ate static electricity sufficient to damage an ESD.
3. Super capacitor or Lithium batteries contain toxic
substances and should not be opened, crushed,
or burned for disposal.
4. Dispose of used batteries according to the manu-
facture's instructions.
Samsung Electronics