Static Electricity Prevention - Lenovo ThinkStation D20 Safety And Warranty Manual

Note: Some computer parts can be upgraded or replaced by the customer.
Upgrades typically are referred to as options. Replacement parts approved
for customer installation are referred to as Customer Replaceable Units, or
CRUs. Lenovo provides documentation with instructions when it is appropriate
for customers to install options or replace CRUs. You must closely follow all
instructions when installing or replacing parts. The Off state of a power indicator
does not necessarily mean that voltage levels inside a product are zero. Before
you remove the covers from a product equipped with a power cord, always make
sure that the power is turned off and that the product is unplugged from any
power source. For more information on CRUs, refer to the ThinkStation Hardware
Installation and Replacement Guide for this product. If you have any questions
or concerns, contact the Customer Support Center.
Although there are no moving parts in your computer after the power cord has
been disconnected, the following warnings are required for your safety.
CAUTION:
Hazardous moving parts. Keep fingers and other body parts away.
CAUTION:
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:
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Chapter 1. Important safety information