Lenovo 3000 J Series - Manual (Page 9)

Danger
Hazardous moving parts. Keep fingers and other body parts away.
Attention
Before replacing any CRUs, turn off the computer and wait three to five
minutes to let the computer cool before opening the cover.
Static electricity prevention
Static electricity, although harmless to you, can seriously damage computer
components and options. Improper handling of static-sensitive parts can cause
damage to the part. When you unpack an option or CRU, do not open the
static-protective package containing the part until the instructions direct you to
install it.
When you handle options or CRUs, or perform any work inside the computer, take
the following precautions to avoid static-electricity damage:
v Limit your movement. Movement can cause static electricity to build up around
you.
v Always handle components carefully. Handle adapters, memory modules, and
other circuit boards by the edges. Never touch exposed circuitry.
v Prevent others from touching components.
v When you install a static-sensitive option or CRU, touch the static-protective
package containing the part to a metal expansion-slot cover or other unpainted
metal surface on the computer for at least two seconds. This reduces static
electricity in the package and your body.
v When possible, remove the static-sensitive part from the static-sensitive
packaging and install the part without setting it down. When this is not
possible, place the static-sensitive packaging on a smooth, level surface and
place the part on it.
v Do not place the part on the computer cover or other metal surface.
Power cords and power adapters
Use only the power cords and power adapters supplied by the product
manufacturer.
Important safety information vii