DFI HR900-B - Manual (Page 34)

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Hardware Installation
7. From the bottom of the board, fasten the provided bolt into the screw and
then connect the cooling fan’s cable to the fan connector on HR900-B.
Fan connector
Bolt
8. Grasping HR900-B by its edges, position it on top of the carrier board with
its mounting holes aligned with the bolts on the carrier board. This will also
align the COM Express connectors of the two boards to each other.
COM Express connectors
on HR900-B
COM Express connectors
on the carrier board