The manual has some really good information on the startup procedure and diagnostics (page 11+).
http://mirror2.ipdb.org/files/125/Bally_1982_Baby_Pac_Man_Manual.pdf
(Topic ID: 185536)
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Baby Pac-Man
Bally, 1982
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Also, if you are going to the trouble of replacing the IDC connectors, you should replace the pins on the board too.
1 week later
Quoted from BingoBongo:Thoughts on the lights and what could have made the transmissions work for awhile?
Have you replaced the IDC connectors MrBally mentioned? Until you replace those and the associated header pins (on your original boards, not the new board), you will forever get intermittent connections between these boards and you will never be able to make sense out of why one or all work one day and not the next.
1 week later
Bally boards use .1" pitch connectors. The links in your post are .156 pitch (much bigger). You want items from this area: https://www.greatplainselectronics.com/categories.asp?cat=70
Get the bag of 100 pins for $5
The housings of the sizes on the boards. Some of the really long connector housings are hard to find and you will need to make them up from 2 housings. To be thourough, you should get the keying plugs too.
I would recommend this crimping tool if you don't have one. https://www.amazon.com/gp/product/B007JLN93S/ref=oh_aui_detailpage_o00_s00
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