(Topic ID: 264801)

WMS Space Mission - Ball Release Issue


13 days ago

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  • 12 posts
  • 6 Pinsiders participating
  • Latest reply 11 days ago by OHEMIO
  • Topic is favorited by 1 Pinsider


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#1 13 days ago

Good afternoon. Working on my WMS Space Mission. Restored it mechanically once when I procured this machine from a sand pile in Myrtle Beach South Carolina several years ago. Every switch, every step unit, checked and repaired all the lose wires. Been a solid restoration and it has stood the test of time.

Regrettably it's been moved three times since due to upgrading homes we lived in. Running into one roadblock that I have not been able to locate in the forum.

My Ball Release is firing. Just not enough to umphf to get the ball into to the shooter lane. I have worked through the schematic. Cleaned the 3A & 4A switches, also cleaned the pulse score motor reels. Then decided that I've gone that far decided to clean all the score motor contacts. Also cleaned the relative Outhole and Ball Index relays and went to the score motor and checked the score stepper unit as well as the player control unit. Tested the A22-550 Ball Release coil with the Ohm meter against the other with the credit unit in the back box. They Ohm out the same value.

At a bit of a loss and think that I went down the right road. Looking for any suggestions on this matter. Much appreciated!

#2 13 days ago

Remember to ensure the Jones plugs are clean and the Game Over and Reset relays are clean and making a good connection.

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#3 13 days ago

Appreciate the response. Will take a look at the both of these relays. I have not looked at either of them working through this process.

#4 13 days ago

If it's firing, but not with enough oomph to get the ball to the lane, have you cleaned the ball release assembly itself? I've had some that were so full of gunk they couldn't fire smoothly, and that's all it took.

#5 12 days ago

From the manual:

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#6 12 days ago

You can determine whether it's an electrical or mechanical problem by running 2 alligator clip jumper wires out the front door. One from the 25 volt fuse, and the other from the ball release coil. When you tap the free ends together, if the ball release remains sluggish the problem is mechanical. If the ball release is crisp and reliable the problem is electrical.

#7 12 days ago


I’ve had the exact same issue with my Space Mission for over a year. Nothing obstructing and have cleaned and checked all the switches that could be involved I think.

For reference, mine kicks the ball over to the shooter lane 7 out of 8 times but not with much force. The 1 time it doesn’t make it, it may take the kicker 2-3 times before it gets over the hump.

#8 12 days ago
Quoted from Sea_Wolf:

For reference, mine kicks the ball over to the shooter lane 7 out of 8 times but not with much force. The 1 time it doesn’t make it, it may take the kicker 2-3 times before it gets over the hump.

You checked the snippet in post 5? Another thought is 'floating contact,' ie-the connection holding the contact on the blade needs a good squeeze with needle nose pliers.

#9 12 days ago
Quoted from currieddog:

You checked the snippet in post 5? Another thought is 'floating contact,' ie-the connection holding the contact on the blade needs a good squeeze with needle nose pliers.

Thanks bud. I’ll give that a look. I also should have mentioned that it is much better since I cleaned the switches, just not 100%, so your suggestion makes a lot of sense.

And like all my EMs, they function better now in general because I play the he’ll out of them, unlike before I got them.

Sounds like the OP’s kickout to the lane is weaker than mine was but hopefully it will get figured out.

#10 12 days ago

Want to thank everyone for sending along information. Really tore into all you sent me took a hard look at the relays. Cleaned and adjusted gaps on switches. Tore apart the ball release coil assembly to make sure I didn't miss anything when I cleaned them the last go round. Cleaned the Coin Step Unit bakelight and fingers. Made a slight adjustment to the Bonus bakelight board to better align the fingers to the rivets. Still wasn't working properly. Could cycle though games 1-4 players. Ball Release was kicking but still not enough juice to kick ball in into the shooter lane.

Most interesting were the Jones Plugs on this pin. I cleaned them once when I bought this game. Cleaned them up again plugged everything back in. Did not realize how sensitive these are on this game versus some of my other EM's. Turned it on nothing was working. Seated all of them again. Back in business.
Since I believed I had gone through every scenario on the schematic and the manual. Still was not pushing the ball in to the shooter lane.

Went back to square one.

Score motor switches 3A & 4A and Index Cam Switch D. Although I cleaned and adjusted them guess the first adjustment was not good enough.

I first adjusted 3A and 4A in the rut of the score motor wheel to almost closed. Started the game the ball launched very hard into the shooter lane. Played a few 1 player then a 4 player using the play field switches and now what I see happening is a little double clutch with the ejector. So I backed off the adjustments a bit on 3A and 4A and it got better less double clutch still launching hard. Made a small adjustment to Cam Switch D. Will also be rechecking the associated relays maybe I have one of the switches with and incorrect gap.

I need a new lock and ball index relays, and another for the coin door. All look like they've seen a lot of plays and are probably original to the game.

So about 90% there. Again, much appreciated all the suggestions guys...they were all helpful getting me to this point.


#11 12 days ago

Did you read my post above?

#12 11 days ago

HowardR if you are asking me that question...definitely read your post. Got down to post #5 and decided to check 3A, 4A, and Index D switch one more time. Although said it's double clutching. Pretty minor and will get an adjustment to the 3A or 4A to stop it. No issue with the coil ejecting hard at this point. Not overheating. Have a few coils to order for change out. Will try the alligator clip method down the road have another pin, two riffle arcades, ball bowler, and old gambling game to restore. More than enough opportunity. Appreciate all the advice...

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