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•
Disconnect all power before:
— Performing a mechanical inspection
— Working near power supplies
— Removing or installing main units
•
Before you start to work on the machine, unplug the power cord. If you cannot unplug it, ask the customer
to power-off the wall box (that supplies power to the machine) and to lock the wall box in the off position.
•
If you need to work on a machine that has exposed electrical circuits, observe the 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, if necessary.
— 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. By observing the above rule,
you may prevent a current from passing through your body.
•
When using testers, set controls correctly and use the approved probe leads and accessories for that tester.
•
Stand on suitable rubber mats (obtained locally, if necessary) to insulate you from 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 the maintenance information. Use extreme care when measuring high voltages.
•
Regularly inspect and maintain your electrical hand tools for safe operational condition.
•
Do not use worn or broken tools and testers.
•
Never assume that power has been disconnected from a circuit. First, check that it has been powered-off.
•
Always 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.
•
Do not touch live electrical circuits with the reflective surface of a plastic dental inspection mirror. The
surface is conductive; such touching can cause personal injury and machine damage.
•
When the power is on and power supply units, blowers and fans are removed from their normal operating
position in a machine, do not attempt to service the units. This practice ensures correct grounding of the
units.
•
If an electrical accident occurs, use caution:
— Switch power off
— Send another person to get help/medical aid
Handling electrostatic discharge-sensitive devices
Any computer part containing transistors or integrated circuits (IC) should be considered sensitive to
electrostatic discharge (ESD). ESD damage can occur when there is a difference in charge between objects.
Protect against ESD damage by equalizing the charge so that the server, the part, the work mat, and the person
handling the part are all at the same charge.
NOTE
Use product-specific ESD procedures when they exceed the requirements noted here.
Make sure that the ESD-protective devices you use have been certified (ISO 9000) as fully effective.
When handling ESD-sensitive parts:
•
Keep the parts in protective packages until they are inserted into the product.
•
Avoid contact with other people.
•
Wear a grounded wrist strap against your skin to eliminate static on your body.
•
Prevent the part from touching your clothing. Most clothing is insulative and retains a charge even when
you are wearing a wrist strap.
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