> Am 09.05.2017 um 18:10 schrieb Jon Elson <el...@pico-systems.com>: > > On 05/09/2017 08:26 AM, Philipp Pap via cctalk wrote: >> Anyhow, now I have 41 and 83 Volts at the 42 and 85V test points, >> but always 0 Volts at the +5,-12,+12,+15V test points. >> The fuses are good and the secondary transformer seems good as well. >> > Does this have a switching power supply for the logic (5, 12, 15V) or is it a > rectifier/filter/regulator off the transformer? > If rectifier/filter/regulator, it seems odd that FOUR voltages would quit at > once. So, I'm guessing it might have a switching supply for those voltages. > It sounds like the regulation circuit failed (display got brighter) and then > a crowbar circuit tripped to shut it down. Unless you are pretty skilled, > switchers can be a bit hard to troubleshoot. It might be easier to get a > supply with the needed voltages and just patch it in. > > Jon
Jon Could you please have a quick look at the photos here https://goo.gl/photos/m5qW1bz8kSujfK7J8 as I’m way under your skill level. Does this look like rectifier/filter/regulator or a switching supply? A complete schematic would make things simpler. Thanks!!!
