vi WorkCentre 3210/3220 Multifunction Printer Service ManualElectrostatic Discharge PrecautionsSome semiconductor components, and the respective sub-assemblies thatcontain them, are vulnerable to damage by Electrostatic Discharge (ESD).These components include Integrated Circuits (ICs), Large-Scale Integratedcircuits (LSIs), field-effect transistors, and other semiconductor chipcomponents. The following techniques will reduce the occurrence ofcomponent damage caused by static electricity.Be sure the power is Off to the chassis or circuit board, and observe all othersafety precautions.■ Immediately before handling any semiconductor components assemblies,drain the electrostatic charge from your body. This can be accomplishedby touching an earth ground source or by wearing a wrist strap deviceconnected to an earth ground source. Wearing a wrist strap will alsoprevent accumulation of additional bodily static charges. Be sure toremove the wrist strap before applying power to the unit under test toavoid potential shock.■ After removing a static sensitive assembly from its anti-static bag, place iton a grounded conductive surface. If the anti-static bag is conductive, youmay ground the bag and use it as a conductive surface.■ Do not use freon-propelled chemicals. These can generate electricalcharges sufficient to damage some devices.■ Do not remove a replacement component or electrical sub-assembly fromits protective package until you are ready to install it.■ Immediately before removing the protective material from the leads of areplacement device, touch the protective material to the chassis or circuitassembly 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 acarpeted floor can generate enough static electricity to damage anelectro-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 onPrinted Circuit Boards (PCB’s).
