> -----Original Message----- > From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Dave > Wade > Sent: 19 December 2015 18:32 > To: 'General Discussion: On-Topic and Off-Topic Posts' > Subject: RE: VAX 4000-500 PSU Overload? > > > > > Seeing as it already seems to have over current sensing, I guess it has some > small resistors in there so perhaps it is possible to measure the current. I > notices one looks like this:- > > http://uk.farnell.com/welwyn/oar1-r020fi/resistor-1-0r020/dp/1200359 >
Ah! So that is what those things are! I definitely think this one is detecting something wrong and shutting down the 12V side. I have just been doing some tests with a dummy load and the 12V side will come up and then go down a few moments later, sometimes it will stay up, it seems a bit random. Presumably then, there is something wrong with the overcurrent detection. I will have to look into how you test these, or perhaps just replace them and see what happens. Regards Rob
