Lenovo ThinkCentre M57e Bedienungsanleitung PDF herunterladen (Seite 65)

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 and ThinkCentre Hardware Installation and

Replacement Guide provide instructions for replacing Self-service and

Optional-service CRUs. Refer to the following tables to determine which

publication contains the instructions you need. To view an online publication,

click Start → All Programs → Online Books → Online Books. Double-click the

appropriate publication. The publications also are available on the Lenovo Web

site at:

http://www.lenovo.com

Note: Use only computer parts provided by Lenovo. Refer to Chapter 5,

“Lenovo Limited Warranty,” on page 37 for warranty information about the

CRUs for your machine type.

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Lenovo ThinkCentre M57e Bedienungsanleitung Seite 65