Fujitsu M5000 User Manual Page 269

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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 M4000 server motherboard unit provides power and signals to its mounted
components by a riser card. The M5000 server 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 Section 13.1, “Motherboard Unit Replacement” on page 13-1 for replacement
procedures.
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