Electrostatic Discharge (Esd) Precautions - Xerox Phaser 7100 Service Manual

General and Operation Overview

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 is Off to the chassis or circuit board, and observe all other safety precautions.
• Immediately 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 under test 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. These can generate electrical charges sufficient to damage
some devices.
• Do not remove a replacement component or electrical sub-assembly from its protective package
until you are ready to install it.
• Immediately 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 unpacked replacement devices. Motion such as your
clothes brushing together, or lifting a foot from a carpeted floor can generate enough static
electricity to damage an electro-statically sensitive device.
• Handle IC's and Erasable Programmable Read-Only Memories (EPROM's) carefully to avoid
bending pins.
• Pay attention to the direction of parts when mounting or inserting them on the Printed Circuit
Boards (PCB's).
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