VAX 4000-500 PSU Overload?

Robert Jarratt robert.jarratt at
Sat Dec 19 17:41:52 CST 2015

> -----Original Message-----
> From: cctalk [mailto:cctalk-bounces at] On Behalf Of Dave
> Wade
> Sent: 19 December 2015 20:44
> To: 'General Discussion: On-Topic and Off-Topic Posts'
> Subject: RE: VAX 4000-500 PSU Overload?
> I wonder if the voltage level detection thinks its out of spec, rather
than the
> over current parts. These PSUs afre exceedingly complex...

Yes, that is my suspicion, but, as I said in another reply, it looks like
this involves tiny surface mount stuff. No idea how to test it, and reverse
engineering the schematic is going to be tough, especially as I can't make
out the markings or identify the device types, so even being able to measure
the components is not going to be easy.



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