4 Jul
2004
4 Jul
'04
4:37 a.m.
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)?
I don't have the IPBs in front of me but I do
think that each half is normally powered by
its own supply. There is some connection between
the two halves, however, since if the LH PSU blows,
the whole machine fails to start. Similarly, if you
have insufficient load on the LH PSU it will not
come up (SMPSU I presume) and that also stops
the machine from working (hence the need for
a load board in some configs).
I don't think I have any schematics for
this range of machines, but it sounds like
you need to fix the dead PSU.
The BA214 (or whatever the smaller cab config
was) would almost certainly have been half
the backplane of a BA213, so it might be possible
to reconfigure the existing box to run with
one PSU and half a backplane while you fix
the broken PSU. Head on over to Manx and pull
a few IPBs to see what you can do (if anything).
Antonio
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Antonio Carlini arcarlini(a)iee.org