Fujitsu SPARC ENTERPRISE M9000 Service Manual page 193

2. Attach the replacement CPU Module.
a. Slide and insert the guide pin on the DDC side of the CPU Module along the
groove of the CMU guide lock.
Set CPU Module on the Guide Lock (1)
FIGURE 6-18
Chapter 6 Replacement of CPU/Memory Board Unit (CMU), CPU, and DIMM 6-35