(Topic ID: 73213)

Home for the Gottlieb SYS1-SYS80B guys, Yep it's a club :)


By Gerry

6 years ago



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#2932 9 months ago

Howdy! I've recently purchased a Genesis in need of work. I have done the ground mods and have the machine almost working fully. However, I am stuck on an issue with the alphanumeric display. As you can see from the pictures only a few segments light and some are very faint. The broken display segments are frozen and never change.

I put a display from my Bounty Hunter in Genesis and it works fine. I've replaced the two 7147 IC hex buffer chips on the board but that had no change. Any suggestions on where to troubleshoot next? Thanks.

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#2940 9 months ago
Quoted from gdonovan:

The two "939" Rockwell chips drive the two displays and is what I would suspect if everything else looks good. Frankly for the cost of the two chips you could pickup a good used display and be done with it. Just make sure the voltages are good on the board though, odds of both chips acting up are slim in my opinion but possible. I just got my Gold Wings display working correct and I'm picking up a spare for good measure, let me know if there is any readings I can do for you.
FYI looking at your pictures it caught my eye the cap has been replaced, is it the correct value? Looks far smaller than the original.

Thanks for responding so quickly. The cap isn't original but its 470uF compared to the 10uF in the schematic. It's had some obvious work done. Hopefully I'll get lucky soon or be able to source one.

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