(Topic ID: 295127)

1977 Gottlieb Bronco flippers stay energized after game

By n2012y

4 months ago


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  • 13 posts
  • 3 Pinsiders participating
  • Latest reply 4 months ago by HowardR
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#1 4 months ago

I'm guessing there is a simple explanation for this. Any tips would be gratefully appreciated.

#2 4 months ago

The switch on the Game Over relay (Q) with a Red+White wire on one terminal and a Red-Yellow wire on the other is responsible for disabling the flippers and other things. It's at 13i on the schematic.

#3 4 months ago

Upon further review... the Q relay is remaining energized.

#4 4 months ago
Quoted from HowardR:

The switch on the Game Over relay (Q) with a Red+White wire on one terminal and a Red-Yellow wire on the other is responsible for disabling the flippers and other things. It's at 13i on the schematic.

Quoted from n2012y:

Upon further review... the Q relay is remaining energized.

Did you look at the switch I mentioned?

#5 4 months ago

I did. It's a make switch that is closed when Q is energized. I must be getting something wrong.

#6 4 months ago
Quoted from n2012y:

I did. It's a make switch that is closed when Q is energized. I must be getting something wrong.

That's different from what I'm seeing on the schematic. Gottlieb schematics are drawn with the game reset and unplugged, implying Q should be de-energized in this picture.

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#7 4 months ago

I guess something is keeping Q energized (when it's plugged in and on) when it shouldn't be.

#8 4 months ago

I understand that it's supposed to be closed when the power is off. I'll recheck the relay.

#9 4 months ago

OK. I carefully checked the relay. The switch is a break switch, so when energized it is not closed, just like the schematic indicates. The Q relay fires, the switch (with the red+white wire) opens and... the flippers are still energized. I actually placed a non conductive strip in the switch and checked for a short at or near the switch. Thanks to you and several other forum members I'm starting to parse schematics, but I seem to be missing something on this one.

#10 4 months ago

Usually a normally closed switch on the hold relay pulses the game over relay when powering on. Check switch that it opens when hold relay pulls in.

#11 4 months ago
  1. After the last player's last ball drains, the Coin Unit should count down to 0 (to award match replays).

  2. When the Coin Unit reaches 0, that should energize the Game Over relay (Q).
  3. When Q energizes, that should open the switch we've been talking about,
  4. Which should disable the flippers etc.
#12 4 months ago

I think the challenge is that the Q switch is open at the end of the game and the flippers are still energized. Here's a question: After I turn on the power, but before I press start, both the game over (Q) and 1st ball (U) relays are energized. Does that sound right?

#13 4 months ago
Quoted from n2012y:

After I turn on the power, but before I press start, both the game over (Q) and 1st ball (U) relays are energized. Does that sound right?

That's correct behavior

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