M8000 and M9000 PSUBP connector shoulder screws should be inspected upon PSU failure.

Asset ID:	1-73-1018989.1
Update Date:	2011-02-09
Keywords:

Solution Type FAB (standard) Sure

Solution 1018989.1 : M8000 and M9000 PSUBP connector shoulder screws should be inspected upon PSU failure.

Impact

Sun SPARC Enterprise M8000 and M9000 platforms manufactured prior to week 33 of 2007 may have insufficiently threaded shoulder screws on the connector of the power supply backplane (PSUBP). This could result in the loss of a power supply.

Contributing Factors

Sun SPARC Enterprise M8000 and M9000 servers manufactured prior to week 33 of 2007 may be impacted by this issue.

Symptoms

This issue may be observed as a PSU which suddenly fails during normal operation. The XSCF failure signature may appear similar to the example below:

Jan 16 14:50:03 xscf0-0 Alarm: /PSU#45:SCF:Unit disappeared unexpectedly

It may also be manifested through low voltages or other PSU faults logged via FMA or in the XSCF error log.

Root Cause

The screw used to fasten the Power Supply Backplane (PSUBP) connector had larger thread relief than the sheet metal hole accommodated. For this reason the screws do not go all the way through which can lead to the PSU becoming electrically disconnected.

Starting in week 33 of 2007 a screen was instituted at the supplier to correct this issue.

Corrective Action

Workaround

No workaround is available.

Resolution

No field corrective action is available. Please open a TSC task if this issue is identified.

Identification of Affected Parts (how to):

Upon failure of a Power Supply (PSU) on one of the impacted platforms, use the attached document to inspect the Power Supply Backplane (PSUBP) connector shoulder screws. Normal screw threads extend 6mm or 8.5 threads.

If the attachment won't open this document can be acquired via the below URL;

http://sdpsweb.central/FIN_FCO/FAB/231541/SPE/Shoulder_screw_inspection.sxc

References

PITT No: 6588111
StopShip/Purge: P001-20431

For information about FAB documents, its release processes, implementation strategies and billing information, go to the following URL:

http://tns.central/fab

For Sun Authorized Service Providers go to:

http://tns.central/SPE/fab/

In addition to the above you may email:

FAB-Manager@sun.com

Internal Contributor/submitter
David.Lafko@Sun.COM, Chris.Neimann@Sun.COM

Internal Eng Responsible Engineer
Dan.Nygren@Sun.COM Responsible Manager: Raja.Habib@Sun.COM

Internal Services Knowledge Engineer
Joe.Davis@Sun.COM

Internal Eng Business Unit Group
SSG ES (Enterprise Systems)

Internal Sun Alert & FAB Admin Info
08-Feb-2008: Initial draft completed and sent to Extended Review.
12-Feb-2008: FAB sent to Publish.

Attachments

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