Electrostatic Discharge (Esd) Precautions - Xerox Phaser 3500 Service Manual

Electrostatic Discharge (ESD) Precautions

Some semiconductor components, and the respective sub-assemblies that contain them, are
vulnerable to damage by Electrostatic Discharge (ESD). These components include Integrated
Circuits (ICs), Large-Scale Integrated Circuits (LSIs), field-effect transistors and other
semiconductor chip components. The following techniques will reduce the occurrence of
component damage caused by static electricity.
Be sure the power to the chassis or circuit board is off, and observe all other safety
precautions.
■ Before handling any semiconductor components assemblies, drain the electrostatic
charge from your body. This can be accomplished by touching an earth ground source
or by wearing a wrist strap device connected to an earth ground source. Wearing a
wrist strap will also prevent accumulation of additional bodily static charges. Be sure
to remove the wrist strap before applying power to the unit to avoid potential shock.
■ After removing a static sensitive assembly from its anti-static bag, place it on a
grounded conductive surface. If the anti-static bag is conductive, you may ground the
bag and use it as a conductive surface.
Do not use freon-propelled chemicals, as they can generate electrical charges that may
■
damage some devices.
■ Do not remove a static sensitive replacement component or electrical sub-assembly
from its protective package until you are ready to install it.
■ Before removing the protective material from the leads of a replacement device, touch
the protective material to the chassis or circuit assembly into which the device will be
installed.
■ Minimize body motions when handling unpackaged replacement devices. Simple
motions such as your clothes brushing together or lifting a foot from a carpeted floor
can generate enough static electricity to damage a static sensitive device
Handle IC's and EPROM's carefully to avoid bending pins.
■
■ Pay attention to the direction of parts when mounting or inserting them on Printed
Circuit Boards (PCB's).
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