(Topic ID: 291006)

EBD Feature Lights and Coil issues

By chuckwurt

8 months ago



Topic Stats

  • 5 posts
  • 2 Pinsiders participating
  • Latest reply 8 months ago by chuckwurt
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#1 8 months ago

I have a goofy one! two issues:

1. No feature lights work. No idea where to start with this one.

2. Three coils do not fire. The 4 bank drops reset, the upper saucer, and the outhole kicker.

Details of the game:

Alltek MPU. These issues are present with the Alltek or the original MPU.

J1 of MPU was repinned. I checked his work and it looks good.

Here is what I have found:

The feature lights never come on, not during attract, in game, or test.

The coil issue is weird though. The coils in question are #s 16,17, and 18. When the game is in solenoid test and it gets to the top two drops of the right bank, it will fire both solenoids. Then when it gets to 16, 17, and 18, it will drop both of those drops, reset the bank, then drop them again. The other coils that are supposed to fire do not.

If I start a game and put a ball in the top saucer, it awards points, then resets the 7 bank drop targets, and then does not kick the ball out.

If I start a game and drain a ball, it awards bonus, then drops the top two drops in the 7 bank, then never kicks the ball out.

I have tried unplugging the large drop bank from under the playfield. The 3 coils in question do not fire when I do that. I disconnected all three coils in question and reconnected them one by one and ran the coil test in between. No joy.

So, my thought now is the SDB. I plan to bring a spare working on next time, but I have never seen anything like this. Any ideas? Apparently those top drops use a relay to tell the game to drop one or the other and they both share one transistor? is that right?

Could that solenoid expander board be bad and need replaced?

Thanks for the help!

#2 8 months ago

The solenoid expander board needs feature lamp voltage to work.

Check your voltages coming off the power supply in the cab.

#3 8 months ago

Will do. So if the feature lamps aren’t getting power, then the expander board isn’t working right, and could cause the goofy solenoid behavior?

#4 8 months ago

Yep

#5 8 months ago

Okay cool. So sounds like I’ll need to concentrate there.

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