Canon W7250 - Manual (Page 116)

Other Important Information
4
4-4
4
Hold the IEEE 1394 expansion board by its metal frame, align it with
the grooves inside the slot, then insert it.
Firmly press the IEEE 1394 expansion board into the slot until the metal
frame fits in the grooves completely.
5
Use the two screws to fasten the IEEE 1394 expansion board.
6
Re-connect the power cord at the power source.
This completes the installation of the IEEE 1394 expansion board.