IBM 2274 manual Power Supply Connectors and Voltages, Power Supply Output Pin Assignment

Power Supply Connectors and Voltages

Refer to the following figures when checking for voltages on power supply cable connectors.

When checking voltages, the power supply fan must be running. To power-on the power supply without using the on/off switch, use a screwdriver or other tool to short the connector JP3 (with the switch cable disconnected from the connector on the syste board), or use a connection (jumper) to short the black and green wires of the 20-pin connector on

power supply.

20-pin Power Connector

	Power Good
		Power Good
Pin-hole side view		Cable side view
Power Supply Output Pin Assignment
Pin	Voltage	Cable Color
1	+3.3Vdc	Orange
2	+3.3Vdc	Orange
3	Ground	Black
4	Power-on	Red
5	Ground	Black
6	+5Vdc	Red
7	Ground	Black
8	Power Good	Gray
9	+5Vdc	Purple
10	+12Vdc	Yellow
11	+3.3Vdc	Orange
12	-12Vdc	Blue
13	Ground	Black

Parts/Test Point Locations 111