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Messages - dayton
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« on: July 18, 2018, 01:14:25 PM »
Thank you Lloyd. I will post on pinside.
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« on: July 17, 2018, 05:44:20 PM »
I have a 1979 Bally Star Trek pinball machine.It was working great then, suddenly, it would not boot-up.Checking the MPU (AS2518-35) board I get the opening flicker, then ONE flash and that's it.My understanding is this means U7 (MC6810) is bad.Replaced chip with 2 other chips with no luck.Checked continuity between each pin and its circuit trace - all good.Checked continuity from each pin to U9 CPU - all good except Address and Data lines no reading...but no reading on any other chips either (don't know why?)...also pin 10 CS0/A9 no reading back to CPU (I did this to ensure no battery damage to socket or traces).I am stumped and could use some suggestions. Thanks for any help you can provide.I would like to get this board fixed as I prefer original to replacement - its a Star Trek thing
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