Fujitsu SPARC M10-4 Service Manual page 313

Lower the cable support.
Remove all the cables connected to the external interface.
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Note -
Remove all PCIe card cassettes.
Note -
Remove all the crossbar units.
Note -
Loosen the three screws securing the mounting frame of the crossbar unit
and then remove the frame.
Figure 15-2
Loosen the screw securing the CPU memory unit and lower the right and left
levers to the horizontal position.
Chapter 15 Maintaining the Operation Panel 289