Hi! this is my first post, and my first pinball machine!
I bought it at an auction and was unable to look inside as they did not have a key -- I ended up paying $800 for it. I sort of lucked out as when I drilled the coin door lock there was $210 in quarters inside! (no silver unfortunately) The latest dated quarter was 1985, and the earliest was 1965.
Only one mouse nest, and other than a leaking battery it was in pretty good shape -- all the fuses tested good. someone had physically cut off the ground on the plug so I wired a new one in. Then I fixed the insulation that had been chewed off some wires by the mice. Then fired her up.
The feature lamps all work, as do the solenoids, and half of the 7 segment pinscore displays work so far. The audio also works. The machine is basically playable now.
Here is my problem, the general illumination (GI) does not work. I tested the rectifier test points and they all tested great except for TP4 which has zero AC voltage on it. The other DC test points are all within spec. Based on the info I can find the GI is powered by the 7.3VAC bus, and I'm at a loss what to do now to trace the issue any further. Does this mean my transformer is bad? I would think not since its clearly providing the proper AC voltages to the BRs for the other buses.
I have already pulled the J1 and J3 plugs and the TP4 remains at zero voltage, so I think that means there isn't a short (but could be mistaken). What should my next steps be?