Making some progress. There are defiantly no shorts in the head box/Playfield 6VAC GI! I spent hour’s double checking everything.
I replaced the 38V smoothing capacitor and with both GI fuses removed, again I have 14VCD & 40VDC as per schematic.
Put the head box fuse in and it goes up to 17VDC & 45VCD.
Now put the second PF fuse in and it goes up to 19VDC & 50VDC.
Whilst triggering the un-controlled solenoids this 50V drops down to around 44V and they are not smashing the ball around now, but the 19VDC stays constant.
I still do not understand how the separately tapped AC GI can affect the rest of the machines DC outputs, because the 24VDC (other solenoids) and 6VDC (controlled lamps) readings are spot on.
Maybe I’m now chasing ghosts in frustration and these are now acceptable readings for this dual 115V transformer configuration?
I only need to get the regulated 12VDC (from separate PSU) to the sound board and I’m almost done.
Any thoughts?
