IBM 7012 manual Step, Did you find a problem?, Did the power-on light come on and go off?

Step 1

Be sure that the external power cable to the system unit has continuity, is plugged into both the system unit and the power outlet, and that the power outlet has been wired correctly with the correct voltage

Did you find a problem?

NO	Go to Step 2.
YES	Correct the problem. Go to ªMap 0410: Repair Checkoutº in theDiagnostic
	Information For Micro Channel Bus Systems.

Step 2

(from Step 1)

1.Set the power switch on the system unit to Off.

2.Follow the procedure in ªTop Cover Removalº on page 3-4.

Attention: P2 and P25 must be connected and disconnected at the same time.

3.Disconnect the P2 and P25 power supply connectors from the system planar.

4.Disconnect the power connectors P3 and P4 from the disk drives or from the system planar.

5.Connect the power cable.

6.Set the power switch on the system unit to On. Wait 10 seconds before answering the following question.

Did the power-on light come on and stay on, and are all the fans running continuously?

NO	Go to Step 3.
YES	Go to Step 5.

Step 3

(from Step 2)

Did the power-on light come on and go off?

NO	Exchange the power supply. Refer to the ªPower Supplyº removal
	procedure on page 3-16. Go to ªMap 0410: Repair Checkoutº in the
	Diagnostic Information For Micro Channel Bus Systems.
YES	Go to Step 4.

2-1520-2Installation and Service Guide