OK! Any idea what the correct voltage is?
Sorry Pete, but that really doesn't get me any further forward. I don't have a friend with an identical organ longing for me to take it to pieces to measure a voltage! These organs are a problem if they need attention, but I paid for your expertise, and your expertise did not extend to this problem.
Thanks Pete. The organ is in the basement of a house that is still under construction - not the ideal electronics workshop. Also one has to dismantle a fair amount in order to get at the PCB. I also happen to be 76, which makes me less agile at getting at the numerous screws under the keyboard that have to be removed!
Will touch base when I manage to get into it!
A story of incompetence! The contrast control appears to be a push button that extends only just above the surface of the bezel. But it is in fact a pot. Having discovered that, it works just fine. So I'm the idiot. Enquiry closed!
Before I discovered this, I had already gone inside the machine. No voltages marked, and without tech gen, it would have been a difficult one to crack.