Lenovo ThinkPad T420i - Manual (Page 37)

Appendix B. Customer Replaceable Units (CRUs)
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 adapter, the power
cord, the battery, and the hard drive. In some products, such components as
memory, 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 CRUare listed in the table on the following page.
Online User Guide and Lenovo Internet Support site,
http://www.lenovo.com/CRUs, provide instructions for replacing self-service
and optional-service CRUs.
The Lenovo Internet Support site, http://www.lenovo.com/CRUs, offers three
options to begin your search: auto detect, “enter the machine type,” and a “drop
down and select.” Setup Instructions provide instructions for several critical CRUs.
To access to the User Guide on your computer, 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 use the following additional resource:
• The Customer Support Center. For the telephone number of the Support
Center for your country or region, see “Worldwide telephone list” on page 5.
Note: Use only computer parts provided by Lenovo. For warranty information
about the CRUs for your machine type, see “Types of Warranty Service”
on page 20.
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