IBM System Storage DS4000, Руководство по техническому обслуживанию аппаратной части

Страница: 15 / 184

Note: The use of a grounding system is desirable but not required to protect
against ESD damage.
– Attach the ESD ground clip to any frame ground, ground braid, or green-wire
ground.
– Use an ESD common ground or reference point when working on a
double-insulated or battery-operated system. You can use coax or
connector-outside shells on these systems.
– Use the round ground-prong of the ac plug on ac-operated computers.
v
Use the black side of a grounded work mat to provide a static-free work surface.
The mat is especially useful when handling ESD-sensitive devices.
Safety inspection procedure
Use this safety inspection procedure to identify potentially unsafe conditions on a
product. Each machine, as it was designed and built, had required safety items
installed to protect users and service personnel from injury. This procedure
addresses only those items. However, good judgment should be used to identify
any potential safety hazards due to attachment of non-IBM features or options not
covered by this inspection procedure.
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:
v
Electrical hazards, especially primary power (primary voltage on the frame can
cause serious or fatal electrical shock).
v
Explosive hazards, such as a damaged cathode ray tube (CRT) face or bulging
capacitor
v Mechanical hazards, such as loose or missing hardware
Complete the following checks with the power off, and with the power cord
disconnected.
1. Check the exterior covers for damage (loose, broken, or sharp edges).
2. Check the power cord for the following conditions:
a.
A third-wire ground connector in good condition. Use a meter to measure
third-wire ground continuity for 0.1 ohm or less between the external
ground pin and frame ground.
b. The power cord should be the appropriate type as specified in the parts
listings.
c. Insulation must not be frayed or worn.
3. Remove the cover.
4. Check for any obvious non-IBM alterations. Use good judgment as to the safety
of any non-IBM alterations.
5. Check the inside the unit for any obvious unsafe conditions, such as metal
filings, contamination, water or other liquids, or signs of fire or smoke damage.
6. Check for worn, frayed, or pinched cables.
7. Check that the power supply cover fasteners (screws or rivets) have not been
removed or tampered with.
Safety
xiii