Lenovo ThinkStation S20 Safety And Warranty Manual page 42

You can find the CRU information in the ThinkStation Hardware Installation and
Replacement Guide for the following machine types: 4105, 4157, and 4217.
Self-service CRUs Optional-service CRUs
Diskette drive or card reader Battery
Hard disk drive Front panel connector assembly
Keyboard Heat sink
Memory module Internal speaker
Mouse Power supply assembly
Optical drive System fan assemblies (front and rear)
Peripheral Component Interconnect
(PCI) card
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ThinkStation Safety and Warranty Guide