This apparatus is approved under approval number NS/G/1234/J/100003 forindirect connection to public telecommunication systems in the United Kingdom.Guidelines for trained techniciansThis section contains information for trained technicians.Inspecting for unsafe conditionsUse the information in this section to help you identify potential unsafe conditionsin an IBM product that you are working on. Each IBM product, as it was designedand manufactured, has required safety items to protect users and servicetechnicians from injury. The information in this section addresses only those items.Use good judgment to identify potential unsafe conditions that might be caused bynon-IBM alterations or attachment of non-IBM features or options that are notaddressed in this section. If you identify an unsafe condition, you must determinehow serious the hazard is and whether you must correct the problem before youwork 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 cord is disconnected.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 308.v Make sure that the insulation is not frayed or worn.4. Remove the left-side 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.xiv System x3300 M4 Type 7382: Installation and Service Guide
