I have been doing more work on my H7878 PSU for my DECstation 5000 Model 240. It looks like if I put the +5V or -12V outputs under any kind of load then it stops working. I have posted more details here: https://robs-old-computers.com/2017/09/17/decstation-5000-model-240-psu-fail ing-under-moderate-load/
Can anyone explain the behaviour? Regards Rob
