Chapter 5. Customer Replaceable Units (Crus) - Lenovo 3000 Safety And Warranty Manual

Chapter 5. Customer Replaceable Units (CRUs)

Customer Replaceable Units (CRUs) are computer parts that can be upgraded
or replaced by the customer. There are two types of CRUs: internal and external.
External CRUs are easy to install, whereas internal CRUs require some
technical skills and in some cases might require tools such as a screwdriver.
However, both internal and external CRUs are safe for removal by the
customer.
Customers are responsible for replacing all external CRUs. Internal CRUs can
be removed and installed by customers or by a Lenovo service technician
during the warranty period.
Desktop computers contain external and internal CRUs. External CRUs are
located outside of the computer. Examples of external CRUs include the
keyboard, the mouse, any USB device, and the power cord. Internal CRUs
cannot be removed without first opening the cover of the computer. Examples
of internal CRUs include memory modules, optical drives, hard disk drives,
adapter cards, and the power supply.
The User Guide and Hardware Installation and Replacement Guide provide
instructions for replacing internal and external CRUs. Refer to the following
tables to determine which publication contains the instructions you need. To
view a publication, open the Start menu from the Windows desktop, select All
Programs, select Online Books, and click Online Books. Double-click the
appropriate publication.
The publications are also available on the Lenovo Web site at
http://www.lenovo.com.
Note: Only use computer parts provided by Lenovo. Refer to Chapter 3,
"Lenovo Limited Warranty," on page 29 for warranty information about the
CRUs for your machine type.
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