(Topic ID: 253812)

EBD trough not ejecting

By mizzou

2 years ago

Topic Stats

  • 8 posts
  • 4 Pinsiders participating
  • Latest reply 2 years ago by BigAl56
  • Topic is favorited by 1 Pinsider


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#1 2 years ago

Something is up with my ebd. When the ball drains the ball trough will not eject. I think it is somehow connected to the one ball target. When i depress the ball lever in the trough the one ball registers and drops...im guessing a bad ground somewhere? Any ideas?

#2 2 years ago

Make sure your solenoid expander board has a 555 bulb in the socket near it.

#3 2 years ago

You mean in the solenoid that ejects the ball?

#4 2 years ago

There's a small square circuit board under the playfeld that has a bulb socket next to it. That's the solenoid expander board, there needs to be a bulb in that socket for the relay to switch reliably. The way it works is it switches the voltage from one set of coils to a different set, which is why your #1 drop is falling instead of the ball ejecting - the solenoid expander board isn't switching properly. Often people either remove the bulb or change it to an led, it needs the full current draw of a 555.


#5 2 years ago

Thanks for the input. I changed it out the existing led for an incandescent bulb (though, I think it may be burnt out) I also noticed that the wiring for the socket wasn't soldered and was just wrapped around the post so I soldered it. re-seated the connector on the board, reflowed the diode on the #1 drop target too...not sure which it was that fixed it but I played 11 of 12 games and had no issues. Thanks for the help!

#6 2 years ago

Weird, if the LED was totally wrong for that, I'da thunk you'd have had other non-functioning expander board type problems with other coils. If you put that LED back in, does everything still work? Are there some LEDs that will borderline 'work' in this board?

#7 2 years ago

It's there for the MOC3011 chip, it needs a certain amount of current to switch over. Any LED that's inefficient would probably work, or an array of many LEDs. All depends on the current draw, and the individual components. Some will be more or less sensitive.

Newer designs of the solenoid expander board don't need the lamp at all.

#8 2 years ago

Happens all the time. Previous owners convert the game to LEDs and change 'em all not realizing the purpose of the load lamp for the solenoid expander and the similar GI flasher.

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