(Topic ID: 237153)

Center Target on Evel Knievel Direct Hit Not Registering


By AdjustFailure

8 months ago



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  • 14 posts
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  • Latest reply 8 months ago by AdjustFailure
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#2 8 months ago
Quoted from AdjustFailure:

My Evel Knievel has had this problem for years - if you "nail" the center stand up target with a hard direct hit, the ball bounces off but does not register a hit. However if it is hit by the ball a bit less directly, a bit softer or at an angle, it always registers the hit with chimes and scoring. I have cleaned and adjusted the switch behind the target but still no change. I am now thinking it is something else, on the boards or the electronics that are the problem. Anyone have any ideas how to diagnose where the problem is that prevents recognizing a fast/hard/direct hit ?
Evel Knievel

Either the small ceramic capacitor on that switch is missing, or has failed. The capacitor is there to stretch the pulse produced by the switch closure, meaning even with a very hard/direct hit it will still get picked up.

#4 8 months ago
Quoted from MrArt2u:

Yup, capacitor definitely the most likely culprit but, I have to ask, how did you clean the switch. Did it involve filing contacts like you would do for an EM?

Well, it could be that it's one of the 155 EM Evel's, but unlikely!

#11 8 months ago
Quoted from AdjustFailure:

Thanks for the advice -- just to ensure I understand you -- which one is ceramic ? The green one ? The one in the machine I will remove and install the green one but across the switch contacts not the diode contacts if I understand correctly (assuming the green one is a good replacement and polarity is a non-issue?)
Sorry for asking such basic questions, I have not worked with capacitors much before and don't want to screw things up.

The original ceramic cap (brown/disc) is incorrectly installed: Should NOT be in parallel with the diode, but across the two blades of the switch (at least one leg needs to be on the right-hand blade, and likely it should be the left-hand leg moved to the right-hand blade). Possibly your original cap is not faulty, just mis-installed.

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