(Topic ID: 152202)

Help adjusting Gottlieb varitarget (Genesis)


By canea

3 years ago



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  • 7 posts
  • 3 Pinsiders participating
  • Latest reply 4 months ago by guard
  • Topic is favorited by 2 Pinsiders

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#1 3 years ago

Struggling to get my varitarget to work properly. It was monkeyed with before I got it, and now I'm not sure how to get it to work properly. I've watched Todd's video, read the repair guides, but it's still not working correctly after a day of adjusting it. Spring tension seems adequate. Coil is able to release the stepper fine.

I have it set up so that the switches rest on each set of rivets with each movement/step. But with the switches stopping on each set of rivets, the game scores continuously. Should the switches stop between the rivets, passing over them to trigger scoring? Should the switches stop on top of the last set of rivets and then the coil be triggered for reset? It looks the switches in Todd's video stop on each set of rivets with each step, but that is not working for me. Can anyone give me a more detailed description of how the varitarget works and how I can adjust mine? Thanks.

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#2 3 years ago

With Genesis, the varitarget is pushed back and locked into place for a split second. Scoring occurs. Then the coil pulls in to release the target.

The switch arms should ride on the rivets with the minimum pressure necessary to score. This reduces drag that the return spring must overcome. This is one time where lubrication is acceptable. A light film of lithium grease on the rivets and Bakelite board where the switches ride also helps reduce drag.

If someone has futzed with it before, the spring may have had a wind taken out of it. There is a way to increase spring pull bag, but I don't recall the exact process whether there is a screw adjustment or a whole extra wind needs to be put in the spring.

Go forth. Fix the spring.
--
Chris Hibler - CARGPB #31
http://ChrisHiblerPinball.com/contact
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The new place for pinball repair info

#3 3 years ago

Thanks, Chris. Finally working on the Genesis you repaired the MPU for. I've got all the issues whittled down to one bad pop bumper driver board and the varitarget (which I think is also affecting the robot reveal as the reveal works in test mode, but not during game play when the varitarget needs to engage correctly to trigger it (?).

I did add tension to the spring. When I got it, it didn't pop back into place at all, but now it does fine. I will lube it a little - I think I have some PBR contact grease.

I understand there are many factors to fine tune the movement, but am looking for a description of where the switches sit. I guess it seems kind of basic, but I'm having the continuous scoring issue if I set it up like I think I should. Both switches stop ON the rivets and don't just pass over them, right? Position one is both switches on the first two rivets. The last position should be both switches on the last two rivets, held for a second and then coil releases and switches go back to the first two rivets?

#4 3 years ago

All of that is correct. Adjustment of the mechanism allows the switch arms to sit right on the rivets at each "ratchet" of the arm. In fact, if the arm is pushed back to be between rivets, it should immediately snap back to be ON a rivet.

If the return spring is too tight, the small coil that pulls in to release the mechanism won't be able to overcome the pressure placed on the relay armature by the Bakelite ratchet.
--
Chris Hibler - CARGPB #31
http://ChrisHiblerPinball.com/contact
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The new place for pinball repair info

#5 3 years ago
Quoted from ChrisHibler:

If the return spring is too tight, the small coil that pulls in to release the mechanism won't be able to overcome the pressure placed on the relay armature by the Bakelite ratchet.

You were right all along. Spring was too tight (my thumb nail can attest to this). I also thought that the way the varitarget worked was that it had to be hit all the way to the final position before reseting vs. reseting after every hit regardless of how far the target travels. So, provided the latter is how it's supposed to function, my varitarget is now working! Thanks for the help.

#6 3 years ago
Quoted from canea:

my thumb nail can attest to this

Been there...done that...got the cuts to show for it.

Quoted from canea:

provided the latter is how it's supposed to function

That's exactly how it's supposed to work. Partial hits score partial points.

Quoted from canea:

Thanks for the help.

My pleasure!
--
Chris Hibler - CARGPB #31
http://ChrisHiblerPinball.com/contact/
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The Place to go for Pinball Repair Info

3 years later
#7 4 months ago

I posted this in the Genesis thread but if someone searches for vari target this will come up so I'll put it here. The contacts on the assembly bracket are movable, mine had simply slid out of position to get a good enough contact to score and initiate the coil to release the target .

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