1) Hold the base printed–circuit board by grabbing its handles, A and B,
and insert it into the rack all the way through, then engage it with the
2) Place the fan unit back into the previous location by following the
mounting procedure described in Section 2.5.3.
3) Attach the cables detached before, correctly.
4) Switch on the power, and make sure that the printed–circuit board
Handle B, with a hook
on the lower side
Fig. 2.6.1 Base printed–circuit board handles