[jan-jaap]

Another case of leaky capacitor damage:



This cleaned up nicely. You wouldn't be able to solder to the pad without cleaning it first. Most of the components with date stamps on them are from end of 1989 (week 45 ... 50), the custom PowerOne transformer is labeled 1/1990 so it's roughly 32 years old.

This PSU had been repaired by a previous owner. Again the bias supply inverter FET. In the majority of PowerOne SPM5 PSUs I've seen this part has failed. I think I'll try to fit it with a small TO220 heatsink to help keep it cool(er).

This power supply is from my 4D/380 VGX "Predator" rack. I had not run this system in a while and I was afraid to power it on after the carnage I found in other PowerSeries PSUs. It was originally owned by a German Fraunhofer Institute. It's this very system, the article dates it to the 2nd half of 1990. VGX (and 33MHz IP7 CPUs) were first introduced with IRIX 3.3 in 06/1990. I kept the name "DALI".



Also, I finally received the silicone adhesive to finalize the rebuild of the first two power supplies.