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14
POWER SYSTEM
Power Distribution boards
There are various power distribution boards in your server (see the service
section for their removal instructions.) They are associated with the
following components:
♦
Motherboard
♦
Removable media (5.25 inch) bays
♦
Hard disk drives
♦
Electronics chamber cooling fans
The main purpose of these boards is to distribute power from a single source to
several different components. However, the motherboard power distribution and
the cooling fan board have additional functions. The following paragraphs explain
the additional functions that apply to each board.
Motherboard Power Distribution Board
There are several additional functions for this board, but the main ones are:
♦
The audio signals from the motherboard and the system controller are
mixed and amplified and sent to the loudspeaker.
♦
The board is also a collection point for signals to and from the various
System Management and controller cards.
♦
The board contains a 5 to 3.3 Volt DC-DC converter.
♦
The board also contains an internal temperature sensor.
6
A
A
5
Fig 14-1 Motherboard Power Distribution Board
A.
1.
2.
3.
4.
5.
10
9
7
8
A
A
Mounting screw holes (x8)
Loudspeaker connection
Data from motherboard
Cooling fan connector
Aux. power connector
SMC ribbon connector
P o w e r s y s t e m
1
2
A
A
6.
SMIC ribbon connector
7.
Power to/from motherboard
8.
Power to/from motherboard
9.
Power to/from motherboard
10.
3.3 v supply to motherboard
A
3
4
A
14/1
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