Chosen Solution
I am trying to fix a 1990 Beseler Dichro 45s enlarger head. It is used to make color photographic enlargements. I believe the voltage at the light bulb socket is supposed to be a stabilized 82 volts. I am getting 90-91 volts at the socket. I am trying to figure out how to test the circuit board to determine what parts are going bad. This is solid state electronics.
Thanks oldturkey03 for getting back to me. I am really interested in fixing the unit as it makes good prints and a new LED one is $4,000. I think my first question is how do I test the board to see which components are not working correctly? I have asked Beseler for the single line diagram, and I have also found this one on the web (not sure if it is the same for my unit, see attached.)
Second, if it is a Vacto Opto Coupler, how do I find an equivalent part that will do the same thing? If I can’t, I would like to figure out how to connect a external voltage controller to the unit and have it operate the system, or build a new one to replace this. I had electronics a long time ago, so I am reaching back trying to remember how to do all this testing and replacement. Best, David
