What does 'customer replaceable unit' refer to?

The term 'customer replaceable unit' specifically refers to components that are designed to be easily replaced by the customer without professional assistance. This means that these parts are user-friendly, often come with straightforward instructions, and do not typically require specialized tools or skills. Examples often include items like batteries, hard drives, or RAM in certain devices, which users can swap out if needed.

In contrast, the other options refer to situations or components where the customer is not typically involved in the replacement process. For instance, parts that must be replaced by a technician often require special training and tools, meaning they are not considered customer replaceable. Components that under no circumstances can be replaced may refer to integrated parts that are permanently fixed, while warranty voiding components imply that their replacement could invalidate a warranty, making them unsuitable for DIY replacement by users.