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 non-IBM alterations
or attachment of non-IBM features
or optional devices 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:
- Electrical hazards, especially primary power. Primary voltage
on the frame can cause serious or fatal electrical shock.
- Explosive hazards, such as a damaged CRT face or a bulging capacitor.
- Mechanical hazards, such as loose or missing hardware.
To inspect the product for potential unsafe conditions, complete
the following steps:
- Make sure that the power is off and the power cords are disconnected.
- Make sure that the exterior cover is not damaged, loose, or broken,
and observe any sharp edges.
- Check the power cords:
- 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.
- Make sure that the power cords are the correct type.
- Make sure that the insulation is not frayed or worn.
- Remove the cover.
- Check for any obvious non-IBM alterations. Use good judgment as
to the safety of any non-IBM alterations.
- Check inside the system for any obvious unsafe conditions, such
as metal filings, contamination, water or other liquid, or signs of
fire or smoke damage.
- Check for worn, frayed, or pinched cables.
- Make sure that the power-supply cover fasteners (screws or rivets)
have not been removed or tampered with.