Safety information
safety sections of maintenance information. Use extreme care when measuring high voltages.
vRegularly inspect and maintain your electrical hand tools for safe operational condition.
vDo not use worn or broken tools and testers.
vNever assume that power has been disconnected from a circuit. First, check that it has been powered off.
vAlways look carefully for possible hazards in your work area. Examples of these hazards are moist floors, nongrounded power extension cables, power surges, and missing safety grounds.
vDo not touch live electrical circuits with the reflective surface of a plastic dental mirror. The surface is conductive; such touching can cause personal injury and machine damage.
vDo not service the following parts with the power on when they are removed from their normal operating places in a machine:
–Power supply units
–Pumps
–Blowers and fans
–Motor generators
and similar units. (This practice ensures correct grounding of the units.)
vIf an electrical accident occurs:
–Use caution; do not become a victim yourself.
–Switch off power.
–Send another person to get medical aid.
Safety inspection guide
The purpose of this inspection guide is to assist you in identifying potentially unsafe conditions. As each machine was designed and built, required safety items were installed to protect users and service personnel from injury. This guide addresses only those items. You should use good judgment to identify potential safety hazards due to attachment of
If any unsafe conditions are present, you must determine how serious the apparent hazard could be and whether you can continue without first correcting the problem.
Consider these conditions and the safety hazards they present:
vElectrical hazards, especially primary power (primary voltage on the frame can cause serious or fatal electrical shock)
vExplosive hazards, such as a damaged CRT face or a bulging capacitor
vMechanical hazards, such as loose or missing hardware
14ThinkPad A21e