I have a Bally Space Invaders pin, took out of storage and going over it. Machine boots up and re-setsifine, hit credit button, ball goes to shooter, and machine starts counting up (score) by 1000pts indefinitely. All other playfield targets seem to work during this. I have looked for stuck switches and have not found any, doesn't mean there isn't one...just haven't found it. Re-seated board connectors and looked for obvious problems, found none. Any suggestions would be appreciated, I'm new at this. Thanks in advance.

Thanks for the help, feeling really stupid that I did not know about the switch test....learning. So switch 15 shows bad w/switch test "clone chamber target" pulled switch and it does not appear to be shorted/stuck. Cap on switch is hard to make out but this is what I think it says; Y5P, .05m, 12v. Also a resistor on switch. So should I replace the cap and see what happens? What should I replace it with (be specific please....again..newbie) and where do I find this replacement.....radio shack is long gone! Makes sense that this switch is bad, as when machine was put into storage scoring was not working for it. Also, during lamp test several lamps did not light, BUT I know they are good......next step? Thanks again guys, your patience w/me and willingness to help are greatly appreciated.

I will verify which lamps are not working tomorrow and post results, sorry for the delay and thanks

Update; Non-functioning bulbs were bad sockets=fixed, clipped cap out of #15 switch and switch test then showed fault at #20 (#2 target?) Decided that this meant middle drop target on left side of game. Checked all switches on that bank of drop targets and found none that were stuck closed. Inserted paper between contacts and still got #20 fault in switch test, no caps to eliminate that I can see....how to proceed? Thanks again

Update: After finding actual #20 switch and clipping cap, no switch errors. Will replace caps on monday and play some games. Then on to Paragon w/issues. Thanks to all who helped...you guys are great!