Step 21

(from Step 20)

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

2.Disconnect the three-digit display connector P23 from the system planar.

3.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?

NO

Go to Step 22.

YES

Exchange the three-digit display. Go to ªMap 0410: Repair Checkoutº in the

 

Diagnostic Information For Micro Channel Bus Systems.

Step 22

(from Step 21)

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

2.Record the locations of all external cables; then disconnect the cables that are plugged into connectors S1, S2, P, K, T, and M on the rear of the system unit.

3.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?

NO

For Models 340, 34H, 350, 355, 360/36T, 365, 370/37T, and 375, 380, 390,

 

39H, and 397 go to Step 23.

 

For Models 320, 32E, and 32H, exchange the system planar. Go to ªMap

 

0410: Repair Checkoutº in the Diagnostic Information For Micro Channel

 

Bus Systems.

YES

Go to Step 24.

Step 23

(from Step 22)

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

2.Disconnect connector P16 from the system planar.

3.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?

NO

Exchange the system planar. Go to ªMap 0410: Repair Checkoutº in the

 

Diagnostic Information For Micro Channel Bus Systems.

YES

Exchange the serial port flex cable. Go to ªMap 0410: Repair Checkoutº in

 

the Diagnostic Information For Micro Channel Bus Systems.

Maintenance Analysis Procedures (MAPs) 2-1520-11

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IBM 7012 manual Bus Systems