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v Use extreme care when measuring high voltages.
v To ensure proper grounding of components such as power supplies, pumps,
v If an electrical accident occurs, use caution, turn off the power, and send another
Inspecting for unsafe conditions
Use this information to help you identify potential unsafe conditions in an IBM
product that you are working on.
Each IBM product, as it was designed and manufactured, has required safety items
to protect users and service technicians from injury. The information in this section
addresses only those items. Use good judgment to identify potential unsafe
conditions that might be caused by attachment of non-IBM features or options that
are not addressed in this section. If you identify an unsafe condition, you must
determine how serious the hazard is and whether you must correct the problem
before you work 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 can
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 following
steps:
1. Make sure that the power is off and the power cords are disconnected.
2. Make sure that the exterior cover is not damaged or broken, and observe any
3. Check the power cords:
4. Check for pinched cables.
– Make sure that another person who is familiar with the power-off controls is
near you and is available to turn off the power if necessary.
– When you are working with powered-on electrical equipment, use only one
hand. Keep the other hand in your pocket or behind your back to avoid
creating a complete circuit that could cause an electrical shock.
– When using a tester, set the controls correctly and use the approved probe
leads and accessories for that tester.
– Stand on a suitable rubber mat to insulate you from grounds such as metal
floor strips and equipment frames.
blowers, fans, and motor generators, do not service these components outside of
their normal operating locations.
person to get medical aid.
cause serious or fatal electrical shock.
sharp edges.
v Make sure that the third-wire ground connector is in good condition. Use a
meter to measure third-wire ground continuity for 0.1 ohm or less between
the external ground pin and the frame ground.
v Make sure that the power cords are the correct type.
v Make sure that the insulation is not frayed or worn.
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vii
Safety
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