6 Jan
2011
6 Jan
'11
7:53 p.m.
A while back I mentioned that I have a MicroVAX 3400
with one of the H7868
PSUs not wanting to work (green light fails to come on). I have just tried
the "faulty" PSU in a MicroVAX 3500 and it works just fine. I took a PSU
from the 3500 and put it in the 3400 and it does not work in the 3400
either, only in the 3500. So clearly there is something else that is causing
the problem and I am looking for suggestions, especially as the machine is
in an awkward location and hard to dismantle speculatively. As a reminder
this machine was working fine and I had not done anything at all to it prior
to its failure, I had not moved it, changed any components or anything
Without sufficient DC load the H7868 will fail to start up.
One supply goes to half the slots. There's a Q-bus card
That is nothing but a bunch of power resistors for this situation, although I
Usually preferred to put in a KDA50 set 'cuz I had a bunch of those :-).
Tim.