4 Jul
2004
4 Jul
'04
4:09 a.m.
On Fri, Jul 02, 2004 at 04:33:23PM -0700, Michael Sokolov wrote:
Dan Kolb <dankolb(a)ox.compsoc.net> wrote:
Oops. My bad. Well, bad of the website I got the info from :)
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: 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.