My Jet Spin has started acting strangely after being moved a couple of times. Points are being scored for the wrong player, usually players that aren't even playing. Some examples:

1-Player Game (5-ball setting)
Ball in Play 1 - Points score for Player 1
Ball in Play 2 - Points score for Player 2
Ball in Play 3 - Points score for Player 4
Ball in Play 4 - Game skips Ball 4 and goes right to Ball 5
Ball in Play 5 - Points score for Player 1

2-Player Game (5-ball setting)
Ball in Play 1 - Points score for Player 1
Ball in Play 1 - Points score for Player 2
Ball in Play 1 - Points score for Player 4
Ball in Play 2 - Points score for Player 2 only
Balls 3-5 - Points score normally for Players 1 & 2.

I switched the game to 3-ball setting and the odd scoring behavior continues:

1-Player Game (3-ball setting)
Ball in Play 1 - Points score for Player 1
Ball in Play 2 - Points score for Player 1
Ball in Play 2 (again) - Points score for Player 4
Ball in Play 4 - Points score for Player 1
Game continues giving ball after ball (all score for Player 1) although no ball in play is lit.

Occasionally, it will play a game normally, but more often than not, at least one ball will score points for the wrong player. Any help would be greatly appreciated!

Yes, it does happen with all scores, 10s, 100s, etc. All points scored on that ball, including bonus, go to the wrong player.

I'm assuming by M/Bs, you mean the make/break switches?

Does the fact that it happened during a move (working flawlessly beforehand) suggest one over the other?

Thanks for the advice everyone - will check it out and report back.

I don't think so. I actually noticed a typo in my original description of the problem:

1-Player Game (5-ball setting)
Ball in Play 1 - Points score for Player 1
Ball in Play 2 - Points score for Player 1 (not player 2 as listed in original post)
Ball in Play 3 - Points score for Player 4
Ball in Play 4 - Game skips Ball 4 and goes right to Ball 5
Ball in Play 5 - Points score for Player 1

In that scenario on ball 3, when the points go to Player 4, the score reels are dark - I think it's still player 1 who is lit up. I'll check it again and report back. If that's the case, is it another clue to the culprit?

Did another test: When playing a 1-player game, and a ball scores for the 4th player, the Player 1 remains lit. So points are going to the 4th player, but the lights indicate that it is Player 1 playing the ball.

Yes - cleaned but not lubed. Getting some Super Lube. Cleaning did not solve the problem.

No, but I will. Won't be able to check until tomorrow.

Update:

PLAYER UNIT: Lots of work and testing done. First off, I observed the Player Unit while someone else played the game. After each "normal" ball, the solenoid fired four times, moving the fingers around the rivets. When the "error" occurs, the solenoid doesn't fire all four times - stops one short, and in turn, the score goes to Player #4 instead of Player #1.

So I cleaned all the rivets with a scotch brite pad and isopropyl alcohol, then lubricated it with a very thin layer of Super Lube. But that did not fix the problem.

Operating the solenoid by hand, it does make each step, seemingly without any difficulty (although if you tilt the Player Unit out, and it doesn't have gravity to help, the spring cannot pull the plunger all the way out of the solenoid). I examined the M/B switches in the back of the unit and tried to clean the contacts. But I did not completely disassemble the unit, which seems to be necessary to do this.

COIN UNIT: Examined the two switches on the front of the unit and they seemed to be gapped properly. Cleaned the rivets on the back side (very dirty) and lubricated them as well. When I put the bakelite disc back on, I did not line up the fingers with the rivets properly and when I started the game, all hell broke loose. Played one player and it just skipped from Player 1 to Player 2 to Player 3 and Player 4, not advancing the balls. I realized what I had done and reset the fingers. That seemed to clear up the problem: Played a 1-Player game and did not have any errant scoring. Was able to play about five 3-ball games before the score started jumping around to other players. And once it happened, it continued to happen.

Tried playing a four-player game and ran into another issue: on a 4 player game (and only on 4 player games), the ball will advance from 1 to 2 when it gets to player 4. Then it stays on ball 2 for player 1-3, then advances to ball 3 when it gets to 4. After player 1-3 play their third ball, the game ends.

Any ideas?

I will check to make sure the fingers of the Player Unit are lining up in the middle of the rivets.

One other issue: Occasionally - usually when a ball doesn't score any points, or no bonus - the ball drains and it simply kicks the ball out again without advancing either the player or the ball number. So if it's a one-player game and it happens on ball two, the ball drains and is kicked out to the plunger without advancing to ball three. I'm assuming that is related to the other problems.

I don't see a ball count unit. Is that only with single-player wedgeheads? Is the ball count part of the Player Unit in this game?

Jet Spin13 (resized).JPG

Jet Spin14a (resized).JPG

I did try this with the Player Unit. I steps fine by hand. And as I mentioned, you can see/hear it fail (solenoid doesn't fire all four times) when it doesn't advance back to Player 1. I will check again and notice the position of the finger when it fails.

Coin Unit seems to work fine, although I have not seen that move at all after the game starts. Is it supposed to move after each ball?

Gotcha. Yes, checked both the Player Unit and Coin Unit and on both the fingers are lined up with the middle of the rivets. The rivets on both have been cleaned and lightly lubed. And the issue still persists...

I'll have to check again and see - it may have only been the first player, first ball. Although I want to say it happened again later in the game. Have to recheck.

HowardR - these are the series of switches in the back of the Player Unit, correct? Does that suggest the problem is there? A make-break switch is not doing what it is supposed to?

By observing the solenoid on the Player Unit when it fails to advance all the way back to Player 1 - seems to suggest that is the problem. Most of the time the errant points go to Player #4 - so the Player Unit only advances three times instead of four (because the solenoid only fires 3 times). What causes the Player Unit solenoid to fire four times to get back to Player 1?

I just checked the photos of the bakelite disc on the player unit and I believe you are correct - it seems to be one position off based on how the screws are lining up. Let me fix that and check it again. Thanks!

You were absolutely correct. And now that it has been adjusted, the issue with the four-player game is fixed.

But the original issue - score jumping around when playing 1-player games - has not been corrected.

Gotcha.

Any chance it could be the AX or BX relays? I don't understand enough about what they do - just throwing it out there.

I will check that as well - thanks!

HowardR - my apologies, I don't have your skill at reading the schematic and knowing where to find it in the game. Are these the 16 switches you've identified in your post? The back side of the Player Unit?

It's hard for me to tell if they are working properly because I don't know how they are supposed to work. When the points that are supposed to go to player 1 go instead to player 4, the solenoid in the PU only fires three times instead of the four times it needs to fire to get back to player 1. But I can't see exactly what is happening with the switches.

I think I'm going to have to take the PU apart to get at those switches and see if they are positioned properly.

I swapped out the coil sleeve on that solenoid and played five "normal" 1-player, 3 ball games before the score went to Player #4. the game played perfectly for about five games before the score went to Player 4. The next game was similar - with one ball's score going to Player #4. Then I had three more normal games. Then another game were the first ball stayed on ball 1 for the second ball, then balls 2 then 3 played normally. So sometimes it works fine, other times it doesn't.

PlayerUnit01a (resized).jpg

Let me recheck the 4-player games. If that plays fine every time, then we'll know the issue is one of those switches, right?

Thanks - let me check that out and I'll report back!

Here is the latest: I played a series of multi-player, three-ball games to see if the score jumped from player to player. Played six games each of two-player, then three-player, then four-player games. Here are the results:

2-player game #3: Player 1 Ball 2 did not advance (in other words, got one free extra ball, without winning an extra ball)
3-player game #6: player 1 ball 2 did not advance
4-player game #1: player 1 ball 1 did not advance
4-player game #6: player 2 ball 3 did not advance

So the score never jumped to a different player. (It had before.) But there seems to be an occasional issue with the ball not advancing.

But when playing single player games, the score continues to jump around. Most of the time it happens on the second ball. And the score usually jumps to Player #4, although it does occasionally jump to Player #3.

Checked the points on Coin Unit where WH-GR, WH-BR and WH-OR connect and they seem okay.

Where are the P2G, P3G and P4G switches located?

Thanks! I'm not seeing P2G, P3G, P4G from the schematic, detailed in post #34. I'm assuming they are switches above P2E, P3E, P4E?