Appeal to the Baby Pac Gods

navyav8tr

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If you are reading this then hopefully you can provide some direction for me as I am getting ready to throw this thing in the pool. I have two situations, one being the blue color pot and the other being a comm issue.

I recently upgraded the MPU to an Alltek Ultimate MPU because I was not getting anything on the screen but when I ran through the tests I was not getting a 80 value in the XMIT/RCV column (getting 0). The XMIT column was showing 80 though. Figuring this was a connector issue I replaced the molex connectors between the MPU and Vidiot board, still no luck.

On a whim I purchased a refurbished VIDIOT Board with the anticipation of sending the old one to K's arcade for repair and having two on hand.

I installed the new VIDIOT Board this morning and still no luck but now not only am I not getting an 80 on the XMIT/RCV column but no blue or the ability to adjust the blue pot. Here is where I have hit a roadblock. I am more of a pinball guy, never really tinkered with video monitors so just looking for some direction, ideas, or suggestions.

Thanks!
 
The pots on those boards do go bad, so its probably just a bad pot on the "new" vidiot board.

You probably need to do more that just the MPU->Vidiot Connector to get her up and running. Every Bally from this era that I have restored needed new connectors for just about every connection. What about the header pins on the vidiot board? They probably have acid damage under the plastic header covers that you cannot see. The solder joints may also be cracked. I would replace the 2 sets that are below the bottom edge of the MPU as it hangs in the game and see what you get.
 
If you have issues with two known working boards, communication issues that is, make sure you have good ground plane, and it would point to the harness, which is terrible for these games, plan on repinning several connectors as mentioned... also, solid voltages from the rectifier board is a must, a rebuild may be needed if you have a bridge out of range...
 
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