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D-18 Sun Fire X4100 and Sun Fire X4200 Servers Service Manual • June 2006
D.10 Motherboard Bus Bar Power Connector
Main power is delivered to the motherboard through a bus bar. There are two pads on
the bottom side of the motherboard that connect +12 V and ground. The pads have
been designed to handle 50 A. The motherboard bus bar connector pads and their
corresponding descriptions are shown in the figure and table in this section.
FIGURE D-10 Motherboard Bus Bar Connector
TABLE D-10 Motherboard Bus Bar Connector Pinouts
Pad Number Pad Name Description
1 +12V +12 V DC power to motherboard
2 GND Ground
Motherboard
Pad 1
Pad 2
Back panel of server