Lenovo 6175 manual Customer Replaceable Units CRUs

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-serviceand 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.

vSelf-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.

vOptional-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.

vBoth 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 31 for warranty information about the CRUs for your machine type.

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