IBM xSeries 346 Hardware Maintenance Manual And Troubleshooting Manual

Also see for xSeries 346: Installation guide User guide Configuration and options guide Option installation guide User guide

Contents

v Always look carefully for possible hazards in your work area. Examples of thesehazards are moist floors, nongrounded power extension cables, power surges,and missing safety grounds.v Do not touch live electrical circuits with the reflective surface of a plastic dentalmirror. The surface is conductive; such touching can cause personal injury andmachine damage.v Do not service the following parts with the power on when they are removed fromtheir normal operating places in a machine:– Power supply units– Pumps– Blowers and fans– Motor generatorsand similar units. (This practice ensures correct grounding of the units.)v If an electrical accident occurs:– Use caution; do not become a victim yourself.– Switch off power.– Send another person to get medical aid.Safety inspection guideThe intent of this inspection guide is to assist you in identifying potentially unsafeconditions on these products. Each machine, as it was designed and built, hadrequired safety items installed to protect users and service personnel from injury.This guide addresses only those items. However, good judgment should be used toidentify potential safety hazards due to attachment of non-IBM features or optionsnot covered by this inspection guide.If any unsafe conditions are present, you must determine how serious the apparenthazard could be and whether you can continue without first correcting the problem.Consider these conditions and the safety hazards 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 bulging capacitorv Mechanical hazards, such as loose or missing hardwareThe guide consists of a series of steps presented in a checklist. Begin the checkswith the power off, and the power cord disconnected.Checklist:1. Check exterior covers for damage (loose, broken, or sharp edges).2. Turn off the computer. Disconnect the power cord.3. Check the power cord for:a. A third-wire ground connector in good condition. Use a meter to measurethird-wire ground continuity for 0.1 ohm or less between the external groundpin and frame ground.b. The power cord should be the appropriate type as specified in the partslistings.c. Insulation must not be 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 unit for any obvious unsafe conditions, such as metal filings,contamination, water or other liquids, or signs of fire or smoke damage.7. Check for worn, frayed, or pinched cables.Appendix B. Safety information 115