Chapter 4. Power Supply
Chapter 4. Power Supply
Power requirements are supplied by a 330-watt power supply in the IntelliStation M Pro. The power
supply provides 3.3-volt power for the Pentium II microprocessor and core chip sets, as well as 5-volt
power for ISA and PCI adapters. Also included is an auxiliary 5-volt (AUX 5) supply to provide power to
power management circuitry and the system board Ethernet function, or a Wake on LAN adapter.
The power supply converts ac input voltages into dc output voltages. The power supply operates at either
115 V ac or 230 V ac. The power supply automatically senses the ac input voltage so that no switch
selection is required when installing the computer.
The power supply provides power for the following components:
System board
ISA and PCI adapters
Internal drives
Keyboard and auxiliary devices
USB devices
A logic signal on the power connector controls the power supply. (The front panel switch is not directly
connected to the power supply.)
The power supply connects to the system board with a 2 x 10 connector and a 1 x 6 connector.
26 Copyright IBM Corp. 1997
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