Xerox WorkCentre Pro 412, Service Manual

Page: 21 / 192

Precautions
WorkCentre Pro 412
Launch Issue 3-1
August 2001
3. Precautions
Follow these ESD precautions to prevent equipment damage.
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 precau-
tions.
2. Before handling a semiconductor component or
semiconductor-equipped assembly, drain off any
electrostatic charge on your body by using the
standard Xerox ESD protection kit, which should
be removed for your personal safety reasons
prior to applying power to the machine.
3. After removing an electrical assembly equipped
with ESDs, place the assembly on the conduc-
tive mat of the ESD kit, to prevent electrostatic
charge buildup in the vicinity of the assembly.
4. Use only a grounded tip soldering iron to solder
or de-solder 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
installing it. Most replacement ESDs are pack-
aged with all leads shorted together by conduc-
tive 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 un-
packed 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.