IBM 704 manual Power-Good Light PS Current-Good Light Description

Padlock Loops: The two side cover padlock loops enable you to insert padlocks (not provided) to secure the side covers to the system unit.

The electro-magnetic interference (EMI) door on the front of the server also has a padlock loop. You can insert a small padlock (not included) through this loop to secure the EMI door to the system unit and help prevent unauthorized access to the hard disk drives in the hot-swap bays.

Power Supplies: All PC Server 704 models support three 420-watt power supplies. In a three-supply system, the third power supply provides redundant power.

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CAUTION:

Power supplies are easy to install and remove, but they are not hot-swappable. Always disconnect all server power cords and all power supply power cords before you remove or install a power supply.

Power-Good Light and Current-Good Light: These green lights

provide status information about the power supply, as follows:

Power-Good Light (PS)	Current-Good Light (I)	Description
On	On	Power supply on and
		OK
Off	Off or On	Power supply failure
On	Off	Current limit

Note: To ensure that the power supply is operational, both lights must be on.

Chapter 1. Introducing the PC Server 704 13