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Avoiding Connector and Backplane
Damage During CRU/FRU Replacement
The connectors on NonStop S-series backplanes have high pin densities
and small pin diameters. When a plugable unit (a CRU/FRU) is installed,
a damaged plastic shell on the unit's connector can bend a pin on the
backplane connector. The initial damage can be hard to see and might go
undetected until more damage is done. This procedure describes how to
identify damaged connectors so that affected CRUs/FRUs and backplanes
can be replaced before they cause further damage. This procedure
should be performed as part of every CRU/FRU replacement.
Caution: Connector damage can be propagated to multiple
CRUs/FRUs and backplanes. Do not install a damaged CRU/FRU in a
good slot or a good CRU/FRU in a damaged slot.
If a system is stable, a CRU/FRU should not be removed to inspect the
connectors unless either the CRU/FRU is being replaced, symptoms have
been encountered, or there is reason to believe connector damage might
have been propagated. For more information, see The Cycle (How
Damage Propagates), Symptoms of a Damaged Pin, Damage Due to
Handling, and Examples of Damage in the Middle of a Connector.
1
Inspect Backplane Connectors
Using a flashlight, examine the connector for bent pins. A bent pin
can be crushed and molded against the inside wall of the
connector housing. See Examples of Damaged Pins on
Backplanes.
Pay particular attention to the pins around the perimeter of the
connector and to the top row of pins. In slots 50 and 55, the 3 left
pins on the top row are the most susceptible to damage. See
PMF CRU and IOMF CRU Slots. When a PMF CRU or IOMF
CRU is installed, these 3 pins are engaged by a section of the
CRU connector that is more likely to propagate damage.
If a bent pin is found, replace the backplane (or enclosure). Do
not try to straighten the pins; they are easily deformed. Locate all
CRUs/FRUs that have been installed in this slot and inspect their
connectors as described in Step 2. To replace a backplane, you
must be a trained service provider. See the
backplane-replacement section of the NonStop S-Series Service
Provider Supplement in the Hardware Service and Maintenance
library.
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