Infrastructure Boards - Sun Oracle Sun Fire X4270 M2 Service Manual

1.2.1

Infrastructure Boards

The server boards are listed in
Infrastructure Boards
TABLE 1-2
Board Description
Motherboard The motherboard includes 2 sockets to 2 CPU modules, slots for
18 DIMMs; 1 port for a USB flash drive, support for 2
rear-mounted, 2.5-inch SATA HDDs; and the ILOM service
processor.
The ILOM service processor (SP) controls the host power and
monitors host system events (power and environmental). The
ILOM SP draws 3.3V standby power from the power supply
when AC power is applied (without the host being powered on)
even when the system is turned off.
Power This board distributes main 12V power from the power supplies
distribution board to the rest of the system. It is directly connected to the connector
board, and connects to the motherboard via a bus bar and ribbon
cable. The power distribution board also has a connector for
connecting the top-cover interlock ("kill") switch.
Connector board This board serves as the interconnect between the power
distribution board and the fan power board, disk backplane, and
the I/O board.
Fan power board This board carries power to the system fan modules. In addition,
this board transfers sensor data for the fan modules.
1-4 Sun Fire X4270 M2 Server Service Manual • May 2011
.
TABLE 1-2
Reference
Section 4.8, "Servicing
the Motherboard" on
page 4-36
Section 5.6, "Servicing
the Power Distribution
Board" on page 5-18
Section 5.7, "Servicing
the Connector Board"
on page 5-21
Section 5.3, "Servicing
the Fan Board" on
page 5-6