root@sgzh.uucp (Bruno Pape) (08/15/90)
There was a posting a while back by someone from Austraila who had problems with system hangs on his 4D/140. I have been researching erratic MP bus errors and system crashes on a 4D/120 and have found a Field Change Order that covers both cases. It is FCO 18, titled "MP Bus Termination Changes", and to quote the field strategy, "Fix on Failure. Whenever a system is failing with MP bus errors, MP cache PON diagnostics, or other erratic system crashes, it is recommended this fix be installed in addition to other normal trouble shooting procedures.". Another section includes "Other" system crashes and hangs. The fix consists of seven 200 ohm 1/4 watt resistors for the backplane, to replace the seven 100 ohm 1/4 watt resistors already there, and making sure that the IO2 board is at revision level C. Hope this helps, Bruno