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The baseboard can be powered from one of the following sources:
the supplied power supply connected to J28
a bench power supply connected to the screw terminals on header J27
an external PCI bus.
Do not supply more than one power source. If you are using the baseboard with the PCI enclosure for example, do not connect a power source to J27 or J28.
To avoid a safety hazard, only connect Safety Extra Low Voltage (SELV) equipment to the connectors on the baseboard.