Appendix b. customer replaceable units – Lenovo ThinkPad Edge E320 User Manual
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Appendix B. Customer Replaceable Units
Customer Replaceable Units (CRUs) are computer parts that the customer can
upgrade or replace. There are two types of CRU: self-service and optional-service.
Self-service CRUs are easy to install. They may be standalone or latched,
or require a screwdriver to remove a maximum of two screws, whereas
optional-service CRUs require some technical skill, as well as tools such as a
screwdriver. However, both self-service and optional-service CRUs are safe for
the customer to remove and replace.
Customers are responsible for replacing all self-service CRUs. Optional-service
CRUs can be removed and installed by customers or, during the warranty period,
by a Lenovo service technician.
Lenovo notebook computers contain both self-service and optional-service CRUs:
• Self-service CRUs: These CRUs can be unplugged, or are secured by no
more than two screws. Examples of this type of CRU are the ac power adapter,
the power cord, the battery, and the hard disk drive. In some products, such
components as memory modules, wireless cards, notebook keyboards, and
palm rests with fingerprint reader and touchpad may also be CRUs.
• Optional-service CRUs: These CRUs are isolated parts within the computer
that are concealed by an access panel, which is typically secured by more than
two screws. Once the access panel is removed, the CRU is visible. Both types
of CRU are listed in the table on the following page.
The Lenovo Support Web site, , provides
instructions for replacing self-service and optional-service CRUs. The Web site
offers three options to begin your search:
• Search by product number
• Search through the product auto-detect function
• Search by product category
Instructions for several critical CRUs can also be found in the Setup Instructions
that comes with your product.
The User Guide also provides instructions for replacing self-service and
optional-service CRUs. To access the User Guide, refer to “User Guide” on page 1.
If you are unable to access these instructions or if you have difficulty replacing a
CRU, you can call the Customer Support Center. For the telephone number of the
Customer Support Center for your country or region, see “Worldwide telephone
list” on page 5.
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