Also check A3j4 Connector. Pins 6 to 12 are connected to the coils you mention, and they may be rusty or broken...

Did you check the 4 bridge rectifiers ?
What happens if you switch the pinball on after you have disconnected the boards (CPU, driver, etc...) ?

Well, when the fuses blow as soon as you switch the pinball on, it is often due to a bridge rectifier shorted. In an HH, there are 4 bridge rectifiers located at the bottom of the cabinet, close to the fuses (which are direct connected to them).

As you are facing a coil problem, it is more than possible that the 24V and/or the 38V bridge rectifiers are burnt.

Testing a bridge rectifier is quite the same as testing 4 diodes and Marvin's bible explains how to do this perfectly.

However, the values you mention for the 4 diodes in-line on A2 are good.

Oups, forgot the last question : No continuity sound when testing a transistor, but a value depending on the transistor type.

Hi Davrol,
Reading between each prong should be around .6 (and 0 the other way). So I suggest you change the bridges with 1.99 or changing values.

I don't think it is a problem if you have continuity form a transistor, as long as it is soldered.

Oh, and if you have to change some BR, I suggest you also change the orange capacitor if it has not been done yet.

Should be fine. Take care to respect polarity as the prong which is not the same direction than the 3 others is +. Its opposite is -. I made the mistake when I soldered a BR and the Fuse kept blowing.
Let us know if the fuses still blow instantly after BR are changed

Good to know guy ! I will need to talk to Bob too, as my HH is still soundless and F4 fuse still blows when the ball enters cellar (and I can't see any trouble with the "U" relay).

Investigations still in progress for me,