0
0
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F
5
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4
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3
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7
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S
S E R VIC ING PR E C AUTIONS
E lectros tatically S ens itive (E S ) Devices
S ome semiconductor (solid state) devices can be damaged
easily by static electricity. S uch components commonly are
called E lectrostatically S ensitive (E S ) Devices. E xamples of
typical E S devices are integrated circuits and some field effect
transistors and semiconductor chip components.
T he following techniques should be used to help reduce the
incidence of component damage caused by static electricity.
1. Immediately before handling any semiconductor component
or semiconductor-equipped assembly, drain off any electro-
static charge on your body by touching a known earth
ground. Alternatively, obtain and wear a commercially avail-
able dis charging wris t s trap device, which s hould be
removed for potential shock reasons prior to applying power
to the unit under test.
2. After removing an electrical assembly equipped with E S
devices, place the assembly on a conductive surface such
as aluminum foil, to prevent electrostatic charge buildup or
exposure of the assembly.
3. Use only a grounded-tip soldering iron to solder or unsolder
E S devices.
4. Use only an anti-static solder removal device. S ome solder
removal devices not classified as •anti-staticŽ can generate
electrical charges sufficient to damage E S devices.
5. Do not use freon-propelled chemicals. T hese can generate
an electrical charge sufficient to damage E S devices.
6. Do not remove a replacement E S device from its protective
package until immediately before you are ready to install it.
(Most replacement E S devices are packaged with leads
electrically shorted together by conductive foam, aluminum
foil,or comparable conductive material).
7. Immediately before removing the protective material from
the leads of a replacement E S device, touch the protective
material to the chassis or circuit assembly into which the
device will be installed.
C aution: B e sure no power is applied to the chassis or cir-
cuit, and observe all other safety precautions.
8. Minimize bodily motions when handling unpackaged replace-
ment E S devices. (Normally harmless motion such as the
brushing together of your clothes fabric or the lifting of your
foot from a carpeted floor can generate static electricity suf-
ficient to damage an E S device.)
EXPLODED VIEW
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