Hi Allison:
The schematic is on my website, as I said in my email yesterday!
See
http://highgate.comm.sfu.ca/pdp8, it's the H740. I had a similar
problem, the cause was a shorted bypass cap.
Good luck, let me know what you find!
Kevin
PS Let me know on those qbus/unibus cards too, once you get the stuff!
Kevin
>
> Well I powered the PDP-8f tonight and guess what? The PS is toast.
>
> I'm not much surprized either. Anyhow this one has a hard short of the
> kind when power is turned off the room light dim. Next step is to pull
> it out of the case and inspect and meter it for where the short is.
>
> Anyone with a schematic? This one is the rear mounted style with the
> cover that says, do not operate with cover removed for more than 15
> minutes. Don't need the whole prints but only some things verified.
>
> Is this a low voltage switcher? Or linear?
> Is there more that one secondary on the transformer?
>
> Both large fans are gone too. the small PS fan is not tested yet. but
> it's stiff so that ones gone too. fans I have plenty of.
>
> Did I mention it was a clean one? ;)
>
>
> Allison
>
>
--
Kevin McQuiggin VE7ZD
mcquiggi_at_sfu.ca
Received on Tue Mar 30 1999 - 23:17:47 BST