Quoted from Yuckster:My Demolition Man started blowing the line fuse. When I power it on, all four flippers engage and hold for a couple of seconds and the main fuse blows.
So you are powering up with coin door open when this happens? That is how I'm reading this because of you saying this-
Quoted from Yuckster:If I power it on with the coin door closed, it boots and then works fine after closing the door.
Or on the second statement you mean open the closed.
I'm thinking you may have a interlock switch on coin door that wires are pinching or shorting out.
Time to find schematics and see if it's plausible.
-Mike