2. Make sure that the exterior cover is not damaged, loose, or broken, and observeany sharp edges.3. Check the power cord:v Make sure that the third-wire ground connector is in good condition. Use ameter to measure third-wire ground continuity for 0.1 ohm or less betweenthe external ground pin and the frame ground.v Make sure that the power cord is the correct type, as specified in “Powercords” on page 222.v Make sure that the insulation is not frayed or worn.4. Remove the top cover.5. Check for any obvious non-IBM alterations. Use good judgment as to the safetyof any non-IBM alterations.6. Check inside the server for any obvious unsafe conditions, such as metalfilings, contamination, water or other liquid, or signs of fire or smoke damage.7. Check for worn, frayed, or pinched cables.8. Make sure that the power-supply cover fasteners (screws or rivets) have notbeen removed or tampered with.Guidelines for servicing electrical equipmentThis information provides the guidelines for servicing electrical equipment.Observe the following guidelines when you service electrical equipment:v Check the area for electrical hazards such as moist floors, nongrounded powerextension cords, power surges, and missing safety grounds.v Use only approved tools and test equipment. Some hand tools have handles thatare covered with a soft material that does not provide insulation from liveelectrical currents.v Regularly inspect and maintain your electrical hand tools for safe operationalcondition. Do not use worn or broken tools or testers.v Do not touch the reflective surface of a dental mirror to a live electrical circuit.The surface is conductive and can cause personal injury or equipment damage ifit touches a live electrical circuit.v Some rubber floor mats contain small conductive fibers to decrease electrostaticdischarge. Do not use this type of mat to protect yourself from electrical shock.v Do not work alone under hazardous conditions or near equipment that hashazardous voltages.v Locate the emergency power-off (EPO) switch, disconnecting switch, or electricaloutlet so that you can turn off the power quickly in the event of an electricalaccident.v Disconnect all power before you perform a mechanical inspection, work nearpower supplies, or remove or install main units.v Before you work on the equipment, disconnect the power cord. If you cannotdisconnect the power cord, have the customer power-off the wall box thatsupplies power to the equipment and lock the wall box in the off position.v Never assume that power has been disconnected from a circuit. Check it tomake sure that it has been disconnected.v If you have to work on equipment that has exposed electrical circuits, observethe following precautions:– Make sure that another person who is familiar with the power-off controls isnear you and is available to turn off the power if necessary.xiv System x3750 M4 Types 8722 and 8733: Installation and Service Guide
