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Lenovo IdeaPad U300/U300s/U400 Hardware Maintenance Manual
Always look carefully for possible hazards in your work area. Examples of •
these hazards are moist oors, nongrounded power extension cables, power
surges, and missing safety grounds.
Do 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.
Do 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.)
If an electrical accident occurs:•
– Caution: do not become a victim yourself.
– Switch off the power.
– Send the victim to get medical aid.