I can only say that they fail often. We have replaced lots in our 11/70. Luckily we have had spares.
Sometimes the failure has been rather catastrofic with blown components. I think these modules run quite hot since discoloured pcb:s are common. /P On Thu, Nov 26, 2015 at 01:01:07PM -0800, Ian Finder wrote: > Hi folks, > > I've begun repairing my PDP 11/40 and have tracked down the first major issue > to the H745 (-15v) regulator. > > Before I dig into it, I just wanted to see if there are any common known > failure cases... Otherwise I'll just dive into troubleshooting it. :) > > Thanks as always- > > - Ian > > Sent from my iPhone
