this is for alphanumeric display +100/-100V

i thought HV replacement for dmd era ?!

Hmmm, yep you are right on that.

Which Power supply do you have exactly?

After looking at the schematics for the 520-5000-00 and the 520-5047-00, you could modify the latter to work like the earlier one does. If you change D9 and D10 to 1N4764 (100V Zener), remove D11 and R14 and disable the +12V supply, it should work. I have not done this before though, but the H/V section on these two boards is very similar to begin with.

You may be able to do this on the 520-5047-01 and 520-5047-02 boards as well... but will require a bit more work and comparison.


I have all 4 schematics here if you need them, PM me if you do.