don't forget you could possibly have a failing supply under load ONLY, so it will fool you at first. Try loading the supply itself (no baords connected) with
the same load measurements as you are getting now, and if the supply fails, your boards aren't causing it per se. The design doesn't have the normal type voltage regulators which are notorious for having "foldback", but they CAN fail in a similar way..... at least for a while....eventually that changes to a full out failure, which is when it gets easy to figure out the problem.
Although this would explain your having difficulty finding a bad board,
you could still have an impedance issue on the other lines. However, applying a bit of logic, you should be able to see
that just a few thousand ohms on each of the other output voltages,
would produce a "sane" level of current draw, and the supply should NOT fail under those conditions, thus pointing more definitely to the supply itself. Good luck
Tim
On Thursday, December 11, 2014 5:14 PM, "martinjboisvert@... [yamahacs80]" <yamahacs80@yahoogroups.com> wrote:
Thank you very much,
That is what I am getting as well... Now I need to find the component that is making the PSU trip! All 15V related boards are disconnected and have been tested individually and not one seems more suspect than the other!!!
Again if anyone has data on the power consumption for individual boards or for the the over all unit... At this point any suggestion is welcome!!!
Cheers