IBM 704 manual Hot-swap Drive Status Indicators, Power Supply OK Status, Current OK

Troubleshooting

The following table describes the power-supply status conditions that the LEDs indicate.

Power Supply OK	Power Supply	Status
LED	Current OK
	LED
Off1	Off1	The power supply has shut down. This
		occurs when the voltage is too high,
		when a fan fails, or when the power
		supply becomes too hot.
On	Off	The voltage to the power supply is low.
		Because the power supply can meet the
		present system requirements, the power
		supply continues to run.
Off	On	The power supply has failed. The
		present system power requirements are
		too low to cause the power supply to
		shut itself down.
On	On	The supply is on and OK.

Notes:

1.The Power-on indicator on the front of the server is not lit.

2.The Power fail indicator on the front of the server illuminates when either power supply LED is not lit.

Hot-swap Drive Status Indicators

You can use the status LEDs above each of the hot-swap drive bays to obtain status information for the drive in the bay.

ŸPower On LED (Left Green LED): A SCSI drive is present in the bay, and the power is on.

ŸDrive In-Use LED (Center Green LED): The server is writing to or reading from the hard disk.

ŸDrive Fault LED (Amber LED): The SCSI drive is faulty. In a disk-array model, this amber LED blinks when the drive is part of a disk array and is being rebuilt.

Chapter 5. Solving Problems 259