>Tothwolf wrote:
> I'm *really* leaning towards a power supply problem. I did already clean
> the power supply (I did that while cleaning the rest of the system). Does
> anyone know where I can find the pinout for the power supply connectors?
Jerome Fine replies:
I have been using both the BA23 and BA123 boxes with PDP-11
systems for about 10 years. During that time, I can't think of a time
when I have a power supply problem with a BA23, but out of about
5 BA123 boxes, two failed with a power supply problem. I attempted
to determine what the cause was in one case and I believe that the
magic smoke escaped from one of the capacitors in the primary
circuit which is used to rectify the AC. As a result, there was a total
failure. I can't remember, but I think that the other problem was also
a total failure.
On the other hand, I also have a problem when I use more than SEVEN
quad boards with the current BA123 box which still works when I also
use a Sigma ESDI RQD11-EC quad Qbus controller with Hitachi DK515-78
hard disk drives of 600 MBytes each. This is most likely a timing problem
that shows up as a dramatic decrease in the READ speed of the drives.
But perhaps it is also related to the power supply since I don't seem to
remember that the problem existed when I first started using the ESDI
Hitachi DK515-78 drives and there were initially ELEVEN quad boards
in the backplane.
Sincerely yours,
Jerome Fine
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Received on Sun Nov 24 2002 - 20:45:01 GMT