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Appendix C FRU List C-3
C.2 System Boards
C.2.1 Motherboard Unit
The motherboard unit is the main circuit board for the midrange servers. The
following components connect to the motherboard unit:
■ CPU modules (two CPU chips per module)
■ Memory boards
■ Backplane unit
■ I/O unit(s) through the I/O backplane
■ eXtended System Control facility unit through the busbar/I/O backplane/power
backplane unit
■ Motherboard DC-DC Converter
The SPARC Enterprise M4000 motherboard unit provides power and signals to its
mounted components by a riser card. The SPARC Enterprise M5000 motherboard
unit supplies power to its mounted components from the power supply backplane
by the bus bar/I/O backplane/power backplane unit. To remove and replace the
motherboard you must power off the system, which is serviced from the top of the
servers.
Refer to “Motherboard Unit Replacement” on page 13-1 for replacement procedures.