Acer Power F5 Aspire T650/E500 and Power F5 Service Guide - Page 114

Fit the PCI-Lock into the chassis to lock the ADD ON cards., to fasten it.

Page 114 highlights

4. Fit the PCI-Lock into the chassis to lock the ADD ON cards. Close the System Place the side door back to the original position, then slide the Lock-handle back to fasten it. 108

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