Service And Upgrades - Lenovo ThinkPad T400 Service And Troubleshooting Manual

Service and upgrades

CAUTION
Do not attempt to service a product yourself unless instructed to do so by the
Customer Support Center or your documentation. Only use a service provider
who is approved to repair your particular product.
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 an AC
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,
see "Customer Replaceable Units (CRUs)" in Service and Troubleshooting
Guide that came with your computer. 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.
DANGER
Hazardous moving parts. Keep fingers and other body parts away.
Chapter 1. Important safety information
3