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crossbar box requiring maintenance.
2.
Remove th e front cover o f the crossbar box.
For details, see "5.5.3 Removing the front cover."
3.
Remove all the fan units.
For details, see "19.4.2 Removing a fan unit."
4.
Loosen the tw o screws (A in the figure) securing the upp er cover a nd then
slide th e right and left stoppers (B in the figure) inw ards. Then, rem ove t he
upper cover (C in the figure).
Figure 23-2
Removing the upper cover
5.
Loosen the one screw (A in the figure) securing the lower co ver and then
slide th e lower cover to the left to remove it.
Chapter 23 Maintaining the Operation Panel of the Crossbar Box 371