DEC H745 regulator common failure modes?

Pontus Pihlgren pontus at Update.UU.SE
Thu Nov 26 23:13:42 CST 2015

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.


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

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