IBM Series 1400 manual Working near power supplies Removing or installing main units, necessary

– Working near power supplies

– Removing or installing main units

ŸBefore you start to work on the machine, un

power cord. If you cannot unplug it, ask th to power-off the wall box that supplies powe machine and to lock the wall box in the off

ŸIf you need to work on a machine that has

electrical circuits, observe the following pre

–Ensure that another person, familiar with power-off controls, is near you.

Attention: Another person must be there to switch off the power, if necessary.

–Use only one hand when working with powered-on electrical equipment; keep the hand in your pocket or behind your back

Attention: There must be a complete circui cause electrical shock. By observing the rule, you may prevent a current from pas through your body.

–When using testers, set the controls corr and use the approved probe leads and a

ries for that tester.

–Stand on suitable rubber mats (obtained

if	necessary)	to insulate you from ground
as	metal floor	strips and machine frames.

Observe the special safety precautions when work with very high voltages; these instructi the safety sections of maintenance informatio extreme care when measuring high voltages. R larly inspect and maintain your electrical han for safe operational condition.

Ÿ Do not use worn or broken tools and testers.

ŸNever assume that power has been disconnecte from a circuit. First, check that it has b powered-off.

ŸAlways look carefully for possible hazards in work area. Examples of these hazards are mo floors, nongrounded power extension cables, po

surges, and missing safety grounds.

ŸDo not touch live electrical circuits with t surface of a plastic dental mirror. The sur conductive; such touching can cause personal and machine damage.

ŸDo not service the following parts with the when they are removed from their normal oper

places in a machine:

– Power supply units

–Pumps

–Blowers and fans

ThinkPad i Series 1400/13500