(Topic ID: 240198)

Gottlieb Sky Jump Drop Targets not Resetting (Also Scoring Issue)


By lint

3 months ago



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  • 21 posts
  • 6 Pinsiders participating
  • Latest reply 89 days ago by lint
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IMG_20190406_200605 (resized).jpg

#1 3 months ago

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

IMG_20190406_200605 (resized).jpg
#2 3 months ago

What are the Motor and the E relay doing when this happens?

#3 3 months ago
Quoted from lint:

I also checked the two fuses for the two reset coils.

Did you take the fuses out and test them with a dmm.

#4 3 months ago
Quoted from HowardR:

What are the Motor and the E relay doing when this happens?

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

#5 3 months ago
Quoted from Raff:

Did you take the fuses out and test them with a dmm.

yes sir. both tested fine with continuity and ohms.

#6 3 months ago
Quoted from lint:

does not reset the drop targets

Quoted from lint:

Motor is spinning and E relay is firing.

Inspect and diagnose this circuit with Alligator clip jumper wires
http://www.planetimming.com/Pinball/troubleshooting/EM%20Troubleshooting.pdf
http://www.pinrepair.com/em/index3.htm#features
Be careful because this circuit runs on 120 volts

Pinball (resized).png
#7 3 months ago

Part of the start sequence Capture (resized).PNG

#8 3 months ago

Since the drop targets don't reset during game play or reset, the most likely culprit is the outside switch on Motor 2C

#9 3 months ago

Hi lint
I read Your post-1 --- "When a game is started ... turning off and on again, starting ... and will continue with the locked on 1k reel". Questions: Did You / do You at some time MANUALLY reset the Drop-Targets ? At what time ? You have made some points on the Score-Drums, have then the fault (locked on 1k reel) - does the L-1000-Point-RELAY also lock-on ? You then toggle off, toggle on, start a game --- do the Score-Drums now reset - or does the pin (kind of) resume ? Greetings Rolf

#10 3 months ago
Quoted from HowardR:

Since the drop targets don't reset during game play or reset, the most likely culprit is the outside switch on Motor 2C

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...

IMG_20190407_132813 (resized).jpg
#11 3 months ago

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

#12 3 months ago
Quoted from HowardR:

Since the drop targets don't reset during game play or reset, the most likely culprit is the outside switch on Motor 2C

Quoted from lint:

The Purple/Orange switch on 2C is open in this reset position

For a switch to work 3 things are necessary
1) When open, there should be a small space between the contact points (duh)
2) When closing, the long blade's contact point should push the short blade's contact point enough to move the short blade
3) The contact points should be clean, which they usually will be if #2 is happening

#13 3 months ago
Quoted from HowardR:

For a switch to work 3 things are necessary
1) When open, there should be a small space between the contact points (duh)
2) When closing, the long blade's contact point should push the short blade's contact point enough to move the short blade
3) The contact points should be clean, which they usually will be if #2 is happening

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

#14 3 months ago
Quoted from currieddog:

Part of the start sequence [quoted image]

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

#15 3 months ago

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

#16 3 months ago
Quoted from HowardR:

Inspect and diagnose this circuit with Alligator clip jumper wires
http://www.planetimming.com/Pinball/troubleshooting/EM%20Troubleshooting.pdf
http://www.pinrepair.com/em/index3.htm#features
Be careful because this circuit runs on 120 volts
[quoted image]

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.

#17 3 months ago

If you'd like to try a phone call, send me your cell phone # in a private message.

#18 3 months ago
Quoted from HowardR:

If you'd like to try a phone call, send me your cell phone # in a private message.

thanks! ill pm you this weekend.

#19 3 months ago

Have you checked the drop target contacts? One may not be opening at the bottom of travel.

#20 3 months ago
Quoted from D-Gottlieb:

Have you checked the drop target contacts? One may not be opening at the bottom of travel.

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.

#21 89 days ago

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.

IMG_20190417_195239 (resized).jpg
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