Longshot
New member
A year and a half ago, I bought an Ultimate MPU from Alltek for my Bally Star Trek. Everything powered up (seven flashes). And so it sat until a week ago, untouched. I had a slew of minor fixes to go through, which are all fix but 2 major problems, 1 is identified.
The first problem, is that the game MPU resets when the ball triggers the out hole switch. A tech brought over an actual Star Trek MPU, which solved that problem. I tried to get him to "accidentally" leave the board, but he wasn't as forgetful as I had hoped.
The second problem baffeled my tech and I both. In game and during the switch test, certian switches activate certian soleniods (ones they shouldn't). The launch lane switch triggers the left bumper, drop target 4 triggers the right bumper, out hole switch triggers lower thumper and so on. It does this with both MPUs. And both solenoid driver boards my tech rebuilt. I also have a brand new power supply.
I assume the problem is in the wiring, but where do I start? Diodes, capacitors? It sounds like a couple wires pinched together, but I wouldn't know which wires to look at? Anyone ever see this before?
The first problem, is that the game MPU resets when the ball triggers the out hole switch. A tech brought over an actual Star Trek MPU, which solved that problem. I tried to get him to "accidentally" leave the board, but he wasn't as forgetful as I had hoped.
The second problem baffeled my tech and I both. In game and during the switch test, certian switches activate certian soleniods (ones they shouldn't). The launch lane switch triggers the left bumper, drop target 4 triggers the right bumper, out hole switch triggers lower thumper and so on. It does this with both MPUs. And both solenoid driver boards my tech rebuilt. I also have a brand new power supply.
I assume the problem is in the wiring, but where do I start? Diodes, capacitors? It sounds like a couple wires pinched together, but I wouldn't know which wires to look at? Anyone ever see this before?

