5 Jun
2003
5 Jun
'03
9:43 a.m.
On Jun 5, 16:19, Tothwolf wrote:
Since we are on the subject of VAXen...
What would be the most likely problem with a BA123 MicroVAX II that
powers
up, but sometimes totally locks up during the
diagnostics? (I'm not
even
sure it can boot, as some of the RD53s sound a little
sick.) I've
pretty
much eliminated the boards as the cause, and the only
things left are
the
backplane and power supply. It does have those older
power supply to
backplane wiring harness cables, which I guess I need to replace
before I
put many boards in the card cage.
Could be voltage drop between PSU and backplane, resulting in low
voltage on the cards. Part of the problem with the harness (which was
discussed here some months ago, in a different context) is that parts
go high-resistance. Check the voltage (especially the +5V) on one of
the cards.
--
Pete Peter Turnbull
Network Manager
University of York