HP T5720 - Compaq Thin Client Hardware Reference Manual page 20

Hardware upgrades
2-8
2. Install the PCI riser card in the PCI expansion slot on the system
board, as shown in the following illustration.
Installing PCI riser card
3. Connect the speaker cable from the PCI Expansion Module
chassis cover to the system board. The speaker is installed in the
PCI Expansion Module chassis cover.
Connecting the speaker
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Hardware Reference Guide