(Topic ID: 255116)

Bally Centaur Switch Matrix issue


By cjs001

14 days ago



Topic Stats

  • 6 posts
  • 4 Pinsiders participating
  • Latest reply 14 days ago by cjs001
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#1 14 days ago

Okay I am going bonkers trying to figure this out, maybe I've over looked something, that is why I am asking in hopes someone can point me in the right direction.
Here is the issue, whenever the 3rd inline drop target drops, all other switches stop working in that row. So if you drop down the #2 target on the right side of the playfield the game doesn't recognize it was dropped, if you hit the spot drop target stand up target it will just try to drop #2 even though its already down. I have replaced the diodes for all switches in that row, I did find the 3rd inline target diode was indeed bad, shorted. Every capacitor under playfield has been removed out of circuit, I repinned connect J2 on MPU, Alltek MPU is in the game. I hit connector J4 with deoxit bc the column wire for the inline targets goes to that connector, just to see if I got a temporary fix. All other inline targets work fine and don't affect anything negatively once they drop. I've checked for shorts in each switch stacks themselves and came up empty. I checked to make sure each switch has the correct wires going to it and diode in correct direction, band away from the column wire color. That all seemed to check out. Pretty sure this game had a playfield swap as every wire and item on the underside is numbered, for what i'm guessing reassembly. Last two things I can think to try, swap out the alltek board with another, or repin all of connector J4, but with all other inlines working I'm not thinking repinning will fix it. What am I overlooking??

#2 14 days ago

Good luck on running this down. I'm facing a similar switch matrix issue on my Bally Playboy and I've done much of the replacing / troubleshooting that you've done with no luck. Mine started after the game was moved cross-country so I'm thinking that something moved and shorted or that something on the Alltek board came loose. I'm considering sending my board back to Alltek to have them check it out.

#3 14 days ago
Quoted from GSones:

I'm considering sending my board back to Alltek to have them check it out.

If you have an Alltek on your other Bally’s you could always swap and see if that fixes it. Man, switch matrix problems really are the worst!

#4 14 days ago

Do all the other switches register properly in switch test?

#5 14 days ago
Quoted from GorillaBiscuits:

If you have an Alltek on your other Bally’s you could always swap and see if that fixes it. Man, switch matrix problems really are the worst!

I've thought about doing that but if I have some sort of short that took out the Alltek board I hate to kill a good one.

The upside to my problem is that I got a chance to learn about a new aspect of pinball repair. The electrical engineers back then were really creative to minimize the amount of playfield wiring and utilizing the limited computing power that was available.

#6 14 days ago

RESOLVED!! Revisited and found inline drop target 3 was indeed shorted within the switch stack, somehow missed it yesterday. Insulator was in the wrong spot within the stack. Everything seems to be in working order now.

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