IBM pSeries 690 Service Manual page 1023

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Table of Contents

9. Grasp both sides of the front DCA, and pull it out of the drawer.

1 I/O Subsystem

2 DCA Captive Thumbscrew (quantity

1. Rotate, counter clockwise, the two captive thumbscrews located on the front of the DCA. Ensure that

the each thumbscrew has been rotated fully into the counter clockwise position.

Rotating the thumbscrews counter clockwise engages the stop mechanism located on the

bottom of the DCA. Failure to do so could result in the system powering off during a concurrent

replacement operation. The following illustrations shows a DCA stop mechanism completely engaged.

1 DCA Captive Thumbscrew (quantity

2 Stop Mechanism (engaged)

2. Carefully slide the DCA into the slot as far as possible (the back edge of the top of the DCA is about

.25 inch from the cage bracket).

Note: Do not force the DCA against the backplane, as this may damage the connector.

3. Hold the upper part of the DCA against the backplane, and use the torque tool to engage the left

captive thumbscrew about two turns into the cage bracket.

4. Repeat the previous step for the right captive thumbscrew.

5. Alternate tightening the left and right thumbscrews until both are fully torqued in.

6. Check torque on both thumbscrews.

7. Plug all cables into their correct location in the DCA.

8. Press the white Service Complete button on the UEPO switch.

3 I/O Subsystem Front Cover

4 Distributed Converter Assembly

2a Stop Mechanism (disengaged)

3 Distributed Converter Assembly

Chapter 9. Removal and Replacement Procedures