More 11/750 PSU Qs - test-drb@ccmp.vtda.org

15 Apr 2002

...
   I was
wondering if any of you know of a good power supply rebuilders in
 the UK?  
Never needed one ;-) 
I hear the sound of a volunteer :-)

...
   order a new
industrial PSU to supply these voltages/currents (plus 
Well, I'd rather keep the machine as original as possible (if only to 
make repairs easier in the future), not to mention the cost of a custom PSU 
This machine used to at least power up without
exploding at least two owner's ago. It seems to
be the same machine reported as having a 2.5V
REGFAIL about four years ago ... so it's not
been powered off for a *really* log time.
OTOH, the PSU blocks do need to be plugged
back in correctly otherwise something 
*will* go phut very loudly.

I'll go read the printset as soon as I dig it
out, it may have details of what goes where.

...
 NO!. SMPSUs do not like being run in parallel (unless
designed to be used 
like that). One PSU will end up attempting to supply all the current and 
the other PSUs may not like having voltages applied to their outputs.  
And once the first one drops dead, the next
most "powerful" one repeats the process.
Proof by "induction" left as an exercise :-)

Antonio