Chapter 5. customer replaceable units (crus) – Lenovo ThinkCentre Edge 72 User Manual
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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: 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.
• 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.
• 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.
• Both types of CRUs are listed in the tables on the following page.
The User Guide provides instructions for replacing Self-service and
Optional-service CRUs. On the Windows 7 operating system, you can view
the publication by clicking Start ➙ Help and Support ➙ Lenovo User Guide.
Double-click the publication for your computer. You can also access the
publication on the Lenovo Support Web site at:
Note: Use only computer parts provided by Lenovo. Refer to Lenovo Limited
Warranty on the warranty viewer or .
The following table lists the CRU information for the following machine types:
3484, 3485, and 3492.
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