I have a Space Invaders I have been slowly bringing back from the dead, and last night I finally was able to get all of the chase lights working again...progress yay! Anywho, I have most of the game functional again, but I am having issues with all of the coils (except for flippers, they are fine and are not part of this discussion).
I decided to replace all of the boards in the game with Alltek and nvram replacement boards for now, so this is not likely a solenoid board problem. What is happening is that overall none of the coils work and I am getting some weird results. The pop bumpers are all dead, except for the middle one, which for some reason inexplicably fires the left slingshot. The left slingshot itself seems to work fine. The left target bank works fine, but the right target bank is dead. Right slingshot is dead. Outhole kicker is dead.
I am buying a new multimeter today to test wire continuity and because my cheapie multimeter is not giving me consistent Ohm readings so I can determine if the coils are simply burned out. They are all giving me ~13 Ohm readings, except for the flippers, which are 0.
Beyond that, I confess to be a total newbie at pinball repair, but I have been watching videos and reading posts for months to try to keep me on track. Hopwever on this I am totally lost, especially with having learned last night that early Bally games are known to have coil gremlins.
Can anyone PLEASE walk me through what I can do to properly troubleshoot this? Otherwise I am going to buy all new coils and hope for the best.