IBM R50 Series Hardware Maintenance Manual

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Contents

8. Check that the power-supply cover fasteners (screwsor rivets) have not been removed or tampered with.Handling devices that are sensitive toelectrostatic dischargeAny computer part containing transistors or integratedcircuits (ICs) should be considered sensitive to electrostaticdischarge (ESD.) ESD damage can occur when there is adifference in charge between objects. Protect against ESDdamage by equalizing the charge so that the machine, thepart, the work mat, and the person handling the part are allat the same charge.Notes1. Use product-specific ESD procedures when theyexceed the requirements noted here.2. Make sure that the ESD protective devices youuse have been certified (ISO 9000) as fullyeffective.When handling ESD-sensitive parts:v Keep the parts in protective packages until they areinserted into the product.v Avoid contact with other people.v Wear a grounded wrist strap against your skin toeliminate static on your body.v Prevent the part from touching your clothing. Mostclothing is insulative and retains a charge even whenyou are wearing a wrist strap.v Use the black side of a grounded work mat to provide astatic-free work surface. The mat is especially usefulwhen handling ESD-sensitive devices.v Select a grounding system, such as those listed below,to provide protection that meets the specific servicerequirement.NoteThe use of a grounding system to guard againstESD damage is desirable but not necessary.– Attach the ESD ground clip to any frame ground,ground braid, or green-wire ground.– When working on a double-insulated orbattery-operated system, use an ESD commonground or reference point. You can use coax orconnector-outside shells on these systems.Safety information20 R50/R50p, R51 Series