On Fri, Jul 02, 2004 at 04:33:23PM -0700, Michael Sokolov wrote:
> Dan Kolb <dankolb_at_ox.compsoc.net> wrote:
>
> > I decided to power on my MicroVAX 3800, after it's been idling for a couple of
> > years (unfortunately due to lack of time on my part), only to find that it's
> > not booting properly. The LED display on the cover/patch panel sits saying 'F'
> > (apparently "Waiting for CDOK"); nothing else happens. Anyone got any ideas as
> > to what may be wrong, or if it's fixable?
>
> First of all, it's DCOK, not "CDOK". Second, the problem may not be in
Oops. My bad. Well, bad of the website I got the info from :)
> the CPU board, it may be the PSU. E.g., it's out of tolerance and does
> not assert the DCOK signal. Follow Tony's advice: check the PSU voltages
> and the state of the DCOK signal before randomly swapping parts (and
> certainly before rushing out to eBay to buy a new KA655 board).
Interestingly, having moved the CPU boards to the left-hand side of the chassis
(it was originally on the right-hand side) allows the machine to start up about
10-20% of the time, whereas before it wasn't starting at all. Would each side of
the backplane be connected to a separate power supply? Would it be at all possible
to run the machine (BA213 chassis) with only one of the power supplies (I think
it's likely that the right-hand supply is slightly dodgy)?
Dan
--
I am more bored than you could ever possibly be. Go back to work.
Received on Sun Jul 04 2004 - 11:09:48 BST