Skee ball Model S problem

jachappy

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Everything was working fine then started resetting itself intermittently, then stopped altogether. Checked fuses and the power supply and found 12 volt power was well over 12. Replaced 12 volt regulator and capacitors and now appear to have correct voltage. Machine turns on, boots up and goes into the attract mode like it used to. When coined up it starts normally...that's where normal ends. It will not respond to any of the scoring switches. When the switch plug is pulled from the pc board it will randomly score points. I was concerned that the over-voltage condition fried one of the IC's but it scores randomly when you pull the plug so if that is counting I'm thinking it's somewhere else. Anyone seen this?
 
Man I really wish I had the answer for you...my Skeeball does the exact same thing! :( I've been trying to figure it out for a long time now. Maybe someone can offer a tip that will help both of us.
 
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First...put dipswitch 4 in the on position to reload the factory defaults. Next..check the two rows of of 1n914 switching diodes. Make sure none of them is shorted. If they test good...I would suspect U9.
-Mark
 
Thanks Mark, as soon as I get back in town (this weekend) I'll take a look. So if any of those switching diodes shorted, it is essentially seeing a stuck switch, correct? Wouldn't that also give me some points or is it that it never opens back up so it doesn't see it as a stroke of a switch?

James
 
Hmm looks like mine is more related to a wiring issue than anything. I did pull the CPU and check all those diodes (with one leg pulled out of circuit) and no problems there. Also swapped out U9 from my other CPU with no change. One problem is I am not certain on where the scoring trough's connector hooks up. There are 3 connectors that go up to the CPU where the trough could connect. Right now it's hooked up to the connector that has 2 wires in each pin....2 black and 2 red. The other 2 connectors are just single red and black wires which I think are for the 100 point pockets that I don't have on my machine at the moment. I noticed my wires were somehow reversed on the trough side compared to the 4 wire connector so I switched things around. I was able to trip the scoring wires and then after tripping the ball count wire I got the sounds I was expecting. I did notice that activating the top 3 switches would cause a little music to play instead of just the plain old tones. Not sure if this is a factory adjustable thing or not, but I have to take a look at my display and see if it's doing something now.
 
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Check diodes and they all checked good. I'm suspecting U9 now... Is there a way to test U9 other than just replacing it?
 
Swapted out U9 and still same problem...Any other problems, possibly with wiring harness loosing a ground? Since I haven't moved anything I find that difficult to believe, but I've seen stranger things.
 
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