I will keep my help to my self from now on Every time I suggest something some one seems to knock me & I am sick of it.. FYI in the last 20 years there is not one pinball machine or arcade monitor that I haven't been able to fix when I personally attend.
Beaky
I have just re-read my post and you will note I have not edited it (original post).
I think you might be reading a bit much into things at least in this post.
Andrej indicated in his first post he was a novice and not done any repairs. I suggested that until the problem was identified I would hold off pulling wires off the interlock switch. I agree that it should be there but in my five years I have seen these hacked and removed which I am sure you have too.
We are all adults here and can have different views. Again there was no personal attack.
My only intentions are to help the original poster identify and fix the problem.
With the reply from Andrej it looks like the issue may be identified and yes you are most likely correct.
**- had to edit this post to fix up iPhone double-ups!