Samsung SCX-4216F Series Service Manual page 6

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 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 electro-
static charge on your body by touching a known earth ground. Alternatively, 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.
2. After removing an electrical assembly equipped with ESDs, place the assembly on a conductive surface, such as alu-
minum 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.
4. Use only an "anti-static" solder removal device. Some solder removal devices not classified as "anti-static" can gener-
ate electrical charges sufficient 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 protective packaging until immediately before installing it. Most replace-
ment ESDs are packaged with all leads shorted together by conductive foam, aluminum foil, or a comparable conduc-
tive material.
7. Immediately before removing the protective shorting material from the leads of a replacement ESD, touch the protec-
tive 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 brushing
together of clothing fabric and lifting one's foot from a carpeted floor, can generate static electricity sufficient to dam-
age an ESD.
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