Compaq Armada M300 Series Reference Manual page 72

To connect the AC Adapter, do the following:
1. Connect the AC adapter to the power connector on the left
side of the mobile expansion unit .
2. Connect the AC power cord to the adapter
3. Plug the power cord into an electrical outlet
To connect devices to the mobile expansion unit:
1. Turn off power to the computer, expansion unit, and all
devices.
2. Connect external devices to the rear connectors on the
expansion unit and turn on power to all devices.
To complete the device connections, some manufacturers
require you to install a software driver. Refer to the documentation
included with the device for details.
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