I am refurbishing a Sky Jump to playable condition and I recently ran into an issue that I am not able to solve on my own. When a game is started the drop targets can be hit and they will score the correct amounts. Once the last target is hit the machine locks on the 1k score reel and does not reset the drop targets. Turning off he machine and starting a new game will also not reset the drop targets and will continue with the locked on 1k Reel.

Below is the drop target section of the schematics. I am still new to EM so any help would be great. I checked and actuated all of the switches on the drop target mechanism all those all seem correct and gapped appropriately. I also checked the two fuses for the two reset coils.

Any tips would be great. -Todd

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thanks for the question.
Motor is spinning and E relay is firing.

yes sir. both tested fine with continuity and ohms.

When I turn the game on after killing the power when it locks on, the motor will reset itself and stop at the below position. The Purple/Orange switch on 2C is open in this reset position which it should be if I am understanding correctly. On E I have Purple/Yellow/Green on a Make/Break which appears to be functioning correctly as well. I hit each of the above contacts with a flexstone, no change. Continuing to trace...

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Here is a video of what is happening. Note I did not have a ball in the trough so points are not registering when I press each drop target. Lighting is not great but you can just make out E Relay firing.

https://vimeo.com/328992110

Thanks, I'll recheck this switch tonight and report back.

Thank you for this. I have the manual as well but rarely remember to look at it for troubleshooting.

note: always order switch adjusters in pairs. where the heck is that thing....

Hi Howard,
I traced everything in your diagram and confirmed all is setup as it should be. I tested continuity through each stage of the circuit and confirmed a good connection between all switches when closed (manually).

Same results. once the drop targets are all down the E relay continues firing 5k to the score reel and the score motor just spins. Just like in the video I posted. If I manually reset the drop targets the game operates normally until the last drop is down. then it does the above.

Any other ideas? Thanks so far by the way. I am much more confident reading schematics after going through that exercise.

thanks! ill pm you this weekend.

yes just check all of them again. all appear to be opening and closing as they need to. Master contact on the back to signal all switches down also opens and closes correctly.

Fixed the problem with the help of HowardR and PhilGreg.

Howard was amazing enough to phone me and walk me through lots of tests, teaching me each step of the way. We traced it down to a bad neutral wire that went up to the Drop Target coils. I traced this wire all the way back to the transformer. Since my transformer had a cage around it I did not notice the wire had come looses. See photo below.

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