Hi Michael
Most instrument SMPSU's will not switch on without a load being present on the primary low voltage supply as this is the only directly regulated one by the switching stage.
My best advise it to find someone that understands and has worked on SMPSU's. There are lethal voltages present at low impedance and it is all too easy to totally wreck them whilst trying to repair them.
73 George G6HIG
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On Saturday, August 17, 2019, 1:35:07 PM GMT+1, Mlynch001 <mlynch002@...> wrote:
Ravi,
I appreciate your kind reply.? Let me expand on my previous comments in that I have no experience repairing SMPS, so any help or suggestion is invaluable.? These things are "clear as mud" to me.? I have no power of any type at the P2 22Pin output connector.? I saw another repair that had mentioned that the opt-isolator might be the issue.? It appears that this PS has two such devices on the board.? These are the white 6 DIP devices near center of the board.? I do not want to start poking around inside this thing and cause more damage, due to my lack of knowledge.? The manual speaks of "loading" the 5V rail with a 1 amp load.? Not sure how you "Load" something that has no voltage output.? Again,? I do not want to start doing something that might magnify my problems.? Looking forward to any thoughts that you may have on the subject.
Sincerely,
--
Michael Lynch
Dardanelle, AR
