--- Michael Sokolov <msokolov_at_ivan.harhan.org> 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
> 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:
Agree. I have a VAX3900
<
http://www.geocities.com/mscpscsi/VAX3900.html>. My
guess is that you have kind of 'minimal' system such
that all your boards are on the right half of the
backplane. Since no board is drawing power from the
leftside PSU it is unhappy. Solution is to add any
board for the left side PSU as I did. I used a M9060
load board.
vax, 3900
> 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).
>
> MS
>
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Received on Fri Jul 02 2004 - 20:47:32 BST