2SPARC Enterprise T5440 Server Service Manual • June 2011
■Memory module – A memory module containing slots for an additional 12
FB-DIMMs is associated with each CMP module.
■Service processor – The service processor (ILOM) board controls the server power
and monitors server power and environmental events. The service processor
draws power from the server’s 3.3V standby supply rail, which is available
whenever the system is receiving main input power, even when the system is
turned off.
A removable IDPROM contains MAC addresses, host ID, and ILOM and
OpenBoot PROM configuration data. When replacing the service processor, the
IDPROM can be transferred to a new board to retain system configuration data.
■Power supply backplane – This board distributes main 12V power from the
power supplies to the rest of the system. The power supply backplane is
connected to the motherboard and the disk drive backplane via a flex cable. High
voltage power is provided to the motherboard via a bus bar assembly.
■Hard drive backplane – This board includes the connectors for up to four hard
drives. It is connected to the motherboard via a flex cable assembly.
Each drive has its own Power/Activity, Fault, and Ready-to-Remove LEDs.
■Front control panel – This board connects directly to the motherboard, and serves
as the interconnect for the front I/O board. It contains the front panel LEDs and
the Power button.
■Front I/O board – This board connects to the front control panel interconnect. It
contains two USB ports.
■Flex cable assembly – The flex cable assembly serves as the interconnect between
the power supply backplane, motherboard, hard drive backplane, and DVD-ROM
drive.
■Power supply backplane I2C cable – This cable transmits power supply status to
the motherboard.
Related Information
■SPARC Enterprise T5440 Server Site Planning Guide
■“Managing Faults” on page11
■“Servicing Customer-Replaceable Units” on page75
■“Servicing Field-Replaceable Units” on page 119