Not to step on Rolf, but I'm sitting here looking at your question...

In Great Britain, the voltage is 230V, correct? I can't quite read the transformer - it's blocked by a wire. But it looks like it says For 230 Tie 2 to (?)

I assume it says "Tie 2 to 3" ...?

That being the case, you would only want the 2-3 jumper. The other side of that Jones plug would fall into the empty socket.

-dave

I do think if you plug in for 120v on a 230V line, that you would blow the main fuse. If it weren't for that, your lights would burn super-bright and quickly burn out, your score motor would overspin and your coils would burn up.

You definitely want one pair of the jumpered plugs in the 2-3 socket.

the other jumpered pair should be placed where it doesn't actually jumper anything. I assume they fall in 4, and the empty socket next to 4...?

I suppose this Jones plug was a good idea, if your machine moves regularly between countries where the power supply changes from 120-340v. For machines that spend their entire life in one country, this would not see too much use.

-d

Also, that 7.5A main fuse is much heavier than needed. That machine would never draw more than 2.5A so, any fuse between 3 and 7 amps would work.

I mention this, if you have fuses of those values laying around, you wouldn't have to wait for your fuses order

https://pinside.com/pinball/forum/topic/how-many-amps-does-a-pinball-use#post-3599213

If I recall correctly yes, that era reset bank is 120v AC on the coil. I assume Rolf has access to the schematic and could confirm.

And yes that is pretty nasty voltage. You don't want to touch it.

If your still blowing line fuses instantly, I would look for solder bridges or something else really amiss. Stuck switches are usually somewhat forgiving