Chapter 3. 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 CRUs
and Optional-service CRUs. 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
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 servers 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 server 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 following table.
The Installation and User Guide provides instructions on how to replace
Self-service CRUs and Optional-service CRUs. Refer to the following table to
determine which publication contains the instructions you need. The
publications are available on the ThinkServer Documentation DVD and also the
Lenovo Web site at:
Table 1. CRUs for the TD230 server
v Memory module
v Ethernet/RAID cards
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List of machine types: 1039, 1040, 1027, and 1029.
v Optical drive
v Hard disk drive