Game is stuck in an endless loop of coining up (playmeter constantly goes up) and the game is constantly resetting (ball count unit, coin unit, player unit, replay unit all constantly resetting). Game will reset to zero if score reels are stepped up...and then keep resetting...and continuously coining up (play meter) but coin unit keeps resetting...

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Completely unplugged coindoor. No change in behavior.

Score motor cam 5 switches A and B open when they should.

I removed all the score reels and tweaked/verified all switches open at zero. No change in behavior.

A couple of times the game would just continuously reset without increments on the total play meter...

Also a couple of times the game started and I was able to play 5 balls...

Something that is somewhat intermittent...but what?

Alright. Currently when I press start the only two relays in the bottom cab that stay pulled in are the lock relay (good) and the reset relay (not good).

Also, all 3 of the score reset relays in the head keep pulsing.

So since the coin relay is now no longer staying pulled in...and index 1C make break looks good...do I have a score reel issue?

Which part?

Here is the problem. It is what I belive to be the Hole Score Drum Unit (by process of elimination). When not at zero at game over and trying to start a new game...it is pulsed to reset it to zero. The plunger is not pulling all the way in so it won't advance to zero. It seems to move freely so now I have to figure out why it is getting such a weak/short pulse...

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OK got it. The 2nd switch from the top in this stack was not making at 1-9 as it should. Cleaned and fixed.

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Next issue. Game has 3 pops. None work. Flippers and slings and kick out holes work. Ok as I am typing this I see a bridge rectifier and a fuse to the bridge rectifier. Fuse is good so bridge is probably bad? If I have to remove it from the circuit to test I guess I may as well just replace it.

The sound does work...hmm. Also I already planned on picking up a 4 fuse block because it's in bad shape. I don't think I jumpered over the fuse for the bridge. I should try that. Or should the sound not work if the fuse connection to the bridge was bad?

Alright. Replaced 4 fuse block and all the lights came on. Pops are working now...had to bust out a fresh flex stone and go to town.

Alright next issue. Knock down all the drops and after last one drops the speaker emits a loud piercing BEEEEEEEEEEEP that doesn't stop until I turn off the machine. Ideas?

Explosion works fine. Ok well now it's all working...lol. I think it's just some dirty relays in the head. 10k most likely.