(Topic ID: 261335)

1963 Gottlieb SQUARE HEAD does not reset after draining ball

By hjh632

1 year ago

Topic Stats

  • 8 posts
  • 3 Pinsiders participating
  • Latest reply 1 year ago by hjh632
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#1 1 year ago

I'd spent several hours getting a Square Head up and running. (Finally found a jammed latch plate on the OB "O" sequence relay) Worked great for 15-20 games...then: when the ball is drained the ball count stepper (works smoothly manually) does not decrement a ball and the 20 unit bank doesn't reset, but activating the ball drain switch trips the delay relay and nothing resets; all the previously scored Xs and Os remain lit. When I manually retrieve the ball the game works fine, but still on ball 5. Everything resets as it should when I start a new game. Puzzling since I had played a number of games without adjusting anything and the problem arose.

I'm kind of new to this, so keep the answers simple, please! Ordered the schematic today.

#2 1 year ago

All the Jones plugs have been cleaned twice.

#3 1 year ago

It's important to tighten all the screws which hold the switch stacks together. There's a LOT of relays in that game, but you should be able to do them all in about ten minutes or so. Run a flexstone through each switch to clean the points.
Manually trip each relay, visually verifying that each switch is changing state.
This procedure should be standard whenever you bring home an EM game, in order to ensure long-term trouble free operation. Do all the motor switches as well.
Do this first, and check back if the issue persists.

#4 1 year ago

Probably better not to get into deep cleaning, esp. the score motor, if you are new. I would wait for the schematic and then check the relevant sw. to make sure they are clean and properly gapped.

#5 1 year ago

Thanks for the responses. Moderately tightened all the all switch stacks and cleaned and checked change of state on relays on the main base board plus small bank on base. No change. Was hesitant to work on the score motor. No change. Then while playing one ball games (about 5-10 of them) and restarting the game after the initial drain, I heard the main bank activate and all is fine, plays as it should. Wish I knew what was causing the problem - sure it will reappear. I would think some switch is just barely making contact. Any ideas of the likely area to look at?

#6 1 year ago
Quoted from hjh632:

Any ideas of the likely area to look at?

Wait for the schematic, then look at the likely areas. It was likely something barely making.

#7 1 year ago
Quoted from currieddog:

Wait for the schematic, then look at the likely areas. It was likely something barely making.

Which is why you need to tighten the switch stacks. If they're loose, you'll have endless intermittent issues.

#8 1 year ago

Continues to work fine. I'll mark as solved,

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