The PSU in my VAXmate failed recently and I think I have found a problem with one of the windings on the transformer not ringing when I test it with a ringing tester. The technical description of the VAXmate says that one winding is operated in flyback mode and I wonder if that has any bearing on the ringing test. Also, one of the pins appears not to be connected to anything else, so possibly a broken (melted?) wire.
Can anyone help with the following questions: Does the fact that one winding is operated in flyback mode have any bearing on the ringing test? Can a transformer fail with a bad smell with no outward sign of damage? Can this transformer be replaced (see picture in blog)? - I suspect not unless I find a donor PSU. Where should I look for a possible cause of the transformer to fail (if indeed it has failed?). I have posted more details here: https://robs-old-computers.com/2020/01/12/possible-cause-of-vaxmate-h7270-ps u-failure/ Thanks Rob
