From: HENRY::IN%"dp%palladian-jasper.lcs.mit.edu%banff.palladian.com%palladian-jasper.lcs.mit.edu%live-oak.lcs.mit.edu%sri-kl.ARPA%relay.cs.net@rca.com" 3-MAR-1987 17:18 To: SIT.BUSH@CU20B.COLUMBIA.EDU Subj: SBI faults Date: Mon 2 Mar 87 13:25:23-EST From: Nick Bush Has anyone seen this problem? We have been getting a fair number of SBI faults logged in the error log on a 785. There do not seem to be any effects from this except the error log entries. The entires claim that the error is an unexpected read fault by TR#8 (a massbus adapter). The only massbus device is a single TM78 which is not is use when the errors occur. Digital Field Service has tried replacing the RH780 boards and the memory boards. This has not made the problem go away. Of course, it is an intermittent problem, so the diagnostics never see it. Has this happened to any systems you know of? If so, how was it resolved? - Nick Bush Sterling-Winthrop Research Institute ARPA: SIT.BUSH@CU20B.COLUMBIA.EDU BITNET: SIT.BUSH@CU20B ------- have them check the coaxial ribbon jumpers on the backplane. they fail eventualy (the ususal corrosion problems, and a 12 insertion hard limit on wigiling them). The first machine I had it happen on was showing bizzare memory errors (not so benign, the machine crashed instead) Adding to the short life was the fact the crews in "Touch Up" used to remove them to give the backplane a final dusting before shipping the machines. they seemed to have about a 2.5 year life in my machine room... (after I quit, I ran into my FS tech who told me when the second machine needed new ones.) These cables are (as far as I know, but not having seen the back of a BI machine) are only present on 780/782/785 series machines.