Grand Prix
Williams, 1976You're currently viewing posts by Pinsider MarkG.
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Quoted from pinballman3:the right Bonus unit will drop back to 0 then it pops back up to 5000 like it should but then drops right back down to 0.
Let's assume that it's just receiving too many reset pulses:
Grand Prix R Bonus reset (resized).jpg
Since the Left Bonus Reset is working properly we can eliminate the Outhole relay and Reset relay switches at the top. I'd start by examining the two switches in red to make sure they're opening and closing as expected.
/Mark
The Left and Right Bonus Unit Step Up solenoids are driven by the Left and Right Advance relays. If you watch the Left Advance relay or attach a bulb tester to it you should see it activate 2 or 3 times (depending on your setting) when the left advance is lit and the top hole switch is closed. Compare that to what happens when the right advance is lit and the top hole switch is closed. Does the Right Advance relay behave the same way? Or does it pulse once and maybe stay active longer?
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Lincoln Park, NJ