Analogue-sequencer

Hello Friends,

Hello Colin,

I have one of the first models, with case in black (style Paul Nagle).
there is an inner xformer (220 -> 7AC).

yesterday I had some problem on the power line and suddenly the P3 shut down.
TOTAL PANIC!!!

I think the problem is the inner xformer
anyway I have a voltage controlled bank power and I gave directly 5volts to the boards

and at the startup I'm getting "chk fail = 7d5c" and p3 stops

Aiutoooooo!!! (heeellllp!!)

What I can do ? what are the correct steps to debug the problem?

thank you
Antonio