Tech: Pin-Bot, top two displays are blank

jehuie

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I'm trying to fix up this old Pin-Bot pinball and it powers up now.
My problem is that the displays all work great except that the top two
(the numeric only ones) are completely blank. This kind of indicates
to me that maybe it's a controller problem or something.

Does anyone have a recommendation on how to begin troubleshooting
this? I'm relatively new to Pinball games but have successfully
gotten a lot of video games working so I'm teachable. Thanks!
 
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