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Chapter 7. 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: Self-service and
Optional-service. Self-service CRUs are easy to install. They might be
standalone, latched, or require a screwdriver to remove a maximum of two
screws. However, Optional-service CRUs require some technical skills and in
some cases might also require simple tools, such as a screwdriver. However,
both Self-service and Optional-service CRUs are safe for the customer to
remove.
Customers are responsible for replacing all Self-service CRUs. Optional-service
CRUs can be removed and installed by customers or by a Lenovo service
technician during the warranty period. Lenovo desktop computers contain
both Self-service and Optional-service CRUs.
v Self-service CRUs: these CRUs unplug or are secured by no more than two
screws. Examples of these types of CRUs include the keyboard, the mouse,
any USB device, and the power cord. Other Self-service CRUs depending on
product design might include memory modules, adapter cards, hard disk
drives, and optical drives.
v Optional-service CRUs: these CRUs are isolated parts within the computer
and are concealed by an access panel that is typically secured by more than
two screws. Once the access panel is removed, the specific CRU is visible.
v Both types of CRUs are listed in the tables on the following page.
The ThinkCentre User Guide provides instructions for replacing Self-service and
Optional-service CRUs. Refer to the following tables to determine which
publication contains the instructions you need. If your computer model has an
internal hard disk drive and preinstalled software from Lenovo, you can view
a publication by clicking Start → All Programs → Online Books → Online
Books. Double-click the appropriate publication for your computer. If your
computer model does not have an internal hard disk drive and preinstalled
software from Lenovo, you can access the publications on the Lenovo Web site
at http://www.lenovo.com.
Note: Only use computer parts provided by Lenovo. Refer to Chapter 5,
“Lenovo Limited Warranty,” on page 29 for warranty information about the
CRUs for your machine type.
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