Chapter 4. Power Supply
Chapter 4. Power Supply
Power is supplied by a 200-watt power supply that operates at either 115 V ac or 230 V ac. The voltage
setting is manually selected with a switch on the rear of the computer. The power supply converts ac
input voltages into dc output voltages and provides power for the following components:
System board
Keyboard and auxiliary ports
Riser card (ISA and PCI adapters)
Internal drives
Local area network device
Power Input
The following table shows the input power specifications.
Power Output
The power supply outputs shown in the following tables include the current supply capability of all the
connectors, including system board, internal drives, PCI, and auxiliary outputs.
Table 20. Power Input Requirements
Description
Measurements
Input voltage, low range
90 V ac (min) to 137 V ac (max)
Input voltage, high range
180 V ac (min) to 265 V ac (max)
Input frequency
50 Hz
±
3 Hz or 60 Hz
±
3 Hz
Table 21. Power Output
Output Voltage
Regulation
Minimum to Maximum (amps)
+
5 V dc
+
5% to
−
4%
1.5 to 20.0
5
+
12 V dc
+
5% to
−
5%
0.2 to 8.0
−
12 V dc
+
10% to
−
9%
0.0 to 0.5
−
5 V dc
+
10% to
−
10%
0.0 to 0.5
+
3.3 V dc
+
5% to
−
4%
0.0 to 20.0
5
+
5 V dc (auxiliary)
+
5% to
−
10%
0.0 to .02
+
5 V dc (Wake on LAN)
+
5% to
−
10%
0.0 to .70
5
Simultaneous loading of
+
3.3 V dc and
+
5 V dc must not exceed 120 watts.
20
Copyright IBM Corp. 1996, 1997
