FRUs and CRUs
This section introduces the location of FRUs and Customer Replaceable Units (CRUs) in the computer, and
identifies which FRUs are also self-service CRUs or optional-service CRUs.
Notes:
• Self-service CRUs: Refer to parts that can be installed or replaced easily by customer themselves or by
trained service technicians at an additional cost.
• Optional-service CRUs: Refer to parts that can be installed or replaced by customers with a greater skill
level. Trained service technicians can also provide service to install or replace the parts under the type of
warranty designated for the customer’s machine.
• FRUs: Refer to parts that must be installed or replaced only by trained service technicians. If customers
choose to replace the FRUs by themselves, the product warranty might be affected.
This chapter includes the following topics:
1. “Major FRUs and CRUs” on page 36
2. “FRUs in the flex module” on page 38
Chapter 2. Product overview 35
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