Guidelines for trained service techniciansThis section contains information for trained service technicians.Inspecting for unsafe conditionsUse this information to help you identify potential unsafe conditions in an IBM ®product that you are working on.Each IBM product, as it was designed and manufactured, has required safety itemsto protect users and service technicians from injury. The information in this sectionaddresses only those items. Use good judgment to identify potential unsafeconditions that might be caused by non-IBM alterations or attachment of non-IBMfeatures or optional devices that are not addressed in this section. If you identifyan unsafe condition, you must determine how serious the hazard is and whetheryou must correct the problem before you work on the product.Consider the following conditions and the safety hazards that they present:v Electrical hazards, especially primary power. Primary voltage on the frame cancause serious or fatal electrical shock.v Explosive hazards, such as a damaged CRT face or a bulging capacitor.v Mechanical hazards, such as loose or missing hardware.To inspect the product for potential unsafe conditions, complete the followingsteps:1. Make sure that the power is off and the power cords are disconnected.2. Make sure that the exterior cover is not damaged, loose, or broken, and observeany sharp edges.3. Check the power cords: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 cords are the correct type.v Make sure that the insulation is not frayed or worn.4. Remove the cover.5. Check for any obvious non-IBM alterations. Use good judgment as to the safetyof any non-IBM alterations.6. Check inside the system 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.Safety ix
