Reviving DEC RX01 power supply - test-drb@ccmp.vtda.org

4 Sep 2007

...
  which is sqrt(2) times as large. sqrt(2)+27.8 is about
40V. Hmmm... Are
 you sure those secondary voltages are reasoable? 
I think so.  The printset doesn't seem to specify the transformer's secondary
voltages, but reviewing my historical notes from other RX0? revivals, the 'normal'
voltages are roughly 24 and 10.

...
  voltage increases. But I could well believe a
reasonably designed
 regualtor would work correctly on double the input voltage, particularly
 on no load. 
It appears that the DEC designer did his/her job well, then, on this particular PS!  :)

...
  > Another suggestion I received privately hints
that putting a dummy load
 > on the PS might bring it into line, and that I will try.  I have access to an

...
  Thing is, you havve an identical PSU that works
without a dummy load (as,
 BTW, do the ones in my RX01s and RX02s). I don't think you need a load on
 this supply/ 
Point taken, but after swapping the 660v AC cap between the units this afternoon, and
seeing no difference.  The only real thing left is the transformer, but I can test
it's output directly, and it's at the 'normal' levels.

So, I guess it's a 'dynamic' issue, rather than a static one.  Maybe the load
does matter.  I'm going to try that next.

- Jared