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Locationnumber Component
1 Crossbarun it(X BU#0)
2 Crossbarun it(X BU#1)
Note- Read andunderstan d the instructions in this chapter before starting the maintenance
work.Also see t he contents of "Chapter 1 BeforeStartin g Maintenance Work."
Figure9-1 Locationof crossbar units
9.2 Before Maintaining a Crossbar Unit
Thissectio n describes the types and flow of maintenance of the crossbar units.

9.2.1 Types of maintenance

Table9-1 lists the types of maintena nce for the crossbar units. For the definition of
maintenance,see "4.3 Understanding Types of Maintenance."
FujitsuM10-4/Fujitsu M10-4S/SPARC M10-4/SPARC M10-4S Service Manual ･December 2013180