General safety guidelines
Always observe the following precautions to reduce the risk of injury and
Do not attempt to service a product yourself unless instructed to do so
by the Customer Support Center. Use only a service provider who is
approved to repair your particular product.
Some parts can be upgraded or replaced by the customer. These
parts are referred to as Customer Replaceable Units, or CRUs. Lenovo
expressly identifies CRUs as such, and provides documentation with
instructions when it is appropriate for customers to replace those parts.
You must closely follow all instructions when performing such
replacements. The Off state of a power indicator does not necessarily
mean that voltage levels inside a product are zero. Always make sure that
the power is turned off and that the product is unplugged from any power
source before you attempt the replacement. If you have any questions or
concerns, contact the Customer Support Center.