A A
BC B
2. Removethe frontcov er.
For details, see "5.5.3 Removing the front cover."
3. Removeall thefan units.
For details, see "19.4 Removinga Fan Unit."
4. Loosenthe two screws (A in the figure) securing the upper cover and slide
theright and left stoppers (B in the figure) inwards. Then, remove the upper
cover (C in the figure).
Figure21-2 Removingthe upper cover
5. Loosenthe one screw (A in the figure) securing the lower cover and then
slidethe lower cover tothe lef t to remove it.
Chapter21 Maintainingthe Crossbar Backplane Unit of the Crossbar Box 347