Ice Cold Beer - Switches Replaced But Motors Keep Running

MF Grocery

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Ice Cold Beer - Switches Replaced But Motors Keep Running

Earlier last month I picked up an ICB project and have done the standard maintenance by replacing lights, all of the micro switches, belts, edge connectors, and even installed new motors from Marco Specialties. Everything was reassembled and just like before I can't get the motors to stop running, even with manually hitting the micro switches.

I've checked wire continuity from the top limit switches all the way through the joysticks and edge connector and we're good. While I'm learning how to read electrical schematics, I'm still not that great and it seems like there might be an IC that's bad. Could someone help me narrow down something on the pcb to check?

Thanks!
 
Do the motors run all the time (immediately when turned on, attract mode, etc), or only after you add credits and start a game? And both motors run all the time?

The part of the schematics that I'd look at first is the right side of Figure 32 (pg 52 of 55 in the manual). U35 creates the logic control signals for the motors. Make sure that RP2 isn't cracked/broken off/etc. U36, U32, U37, U21, and U22 are the logic to drive the base of the motor drive transistors. And lastly, Q8-Q11 and Q16-Q19 are the motor drive transistors.

Hopefully you have a logic probe or oscilloscope, so you can probe the logic lines to see what it's doing... though if it's stuck on, you can try a multimeter (since the pins probably aren't toggling).

Pg. 13 is the start of the theory of operation, which describes in detail how a lot of it works.

DogP
 
Thanks! The motors don't stop when powered up since it's doing its self test. I do have a logic probe and will dive into it this afternoon. Will report back!
 
If you throw the ball into a hole, I assume you can get it to boot to attract mode, right? Normal self-test at startup puts the ball on the bar and takes it up until it falls in a hole.

DogP
 
This whole time it was the motors that were wired wrong. I had the red and black wires connected to the corresponding colors on the motors from Marco Specialties. It's so weird they would do that.

Anyway, thanks for the help DogP! We're now in business!
 
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