Conference netcad::hub_mgnt

1636.0. "DEChub 900 PINWIPE PROBLEM" by NPSS::BIGELOW () Mon Oct 31 1994 10:32

TO:  DISTRIBUTION                               DATE:  31 OCT 94
                                                FROM:  Michele Bigelow
                                                DEPT:  NPS Program Mgmt
                                                EXT:   226-5168
                                                ENET:  NPSS::BIGELOW
                                                
SUBJECT:  PINWIPE POSITION PAGE



        There have been reported failures of the DEChub 900 where the DEChub
        900 display indicates insufficient power available.  This failure has
        been seen on the DMHUB-MB on revision A03 and lower, and on the
        DMHUB-MA with revisions A02 and lower.   One potential cause
        of the failure is due to the 160 pin male and female connectors not
        making proper contact (including the power ID pins) at the time of MAX
        module installation.  This failure is identified as a pinwipe failure
        and is due to insufficient rigidity of the platform material in the
        associated area.  When this failure occurs, all modules to the left of
        the inserted module will be shut down by the HUB900 management control
        module. 
        
        This potential failure has been addressed and corrected in the
        DMHUB-MBs with revision of A04 and higher, and DMHUB-MAs with revision
        of A03 and higher by adding two (2) stiffeners, P/N 74-49383-01 to the
        assembly.  For problems of this type occurring in the installed base,
        the stiffeners are available from Stockroom 17 as a miscellaneous FRU
        and can be added to the DMHUB assembly.  
        
        Network Product Support and Network Development Engineering encourage
        the upgrade of all DMHUB's at any customer site where this problem has
        occurred.
        

  

    Help!  It seems that this should be a straight forward procedure,
    however here at the CSC we have customers calling wanting to know how
    to install the stiffeners. They say that they are getting no
    instructions with the kit. since we have not seen a kit it is difficult
    to advise the customers. Does anyone have documentation for this.
    
    Thanks
    Ray Hall
    CSC-CS Network Support.

    I've sent Ray mail, indicating that I have a hard-copy of the
    procedure that I can FAX to him.
    
    Bob