IBM xSeries 342 2RX Maintenance Manual

Contents

– Removing or installing main unitsv Before you start to work on the machine, unplug the power cord. If you cannotunplug it, ask the customer to power-off the wall box that supplies power to themachine and to lock the wall box in the off position.v If you need to work on a machine that has exposed electrical circuits, observethe following precautions:– Ensure that another person, familiar with the power-off controls, is near you.Remember: Another person must be there to switch off the power, ifnecessary.– Use only one hand when working with powered-on electrical equipment;keep the other hand in your pocket or behind your back.Remember: There must be a complete circuit to cause electrical shock. Byobserving the above rule, you may prevent a current from passing throughyour body.– When using testers, set the controls correctly and use the approved probeleads and accessories for that tester.– Stand on suitable rubber mats (obtained locally, if necessary) to insulate youfrom grounds such as metal floor strips and machine frames.Observe the special safety precautions when you work with very high voltages;these instructions are in the safety sections of maintenance information. Useextreme care when measuring high voltages.v Regularly inspect and maintain your electrical hand tools for safe operationalcondition.v Do not use worn or broken tools and testers.v Never assume that power has been disconnected from a circuit. First, check that ithas been powered-off.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 removedfrom their 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.Related service information 109