I’ve just picked up a jet spin and it’s not scoring. Startup appears to run ok. Scores reset to zero.

When points are scored on the playfield the score relays trigger but none of the scores register on the score reels - they all stay at zero. Score reels do work if 25v applied to trigger them. In addition the score relays latch on and remain latched until the game is switched off or reset. Manually triggering the score relays also causes them to latch on.

Any clues where to look first? This is the first multi player game I’ve worked on!

So when you score points the relays latch (which causes the chime to stay energised). However, no power is applied to the score reels. However the score reels do ‘work’ as they correctly reset to zero at the start of a game.

Thanks. I’ll take a look. Any idea about what might make the point relays lock on when triggered?

Ah right. That makes perfect sense. Tomorrow I’ll take a look at the relay suggested above and see if I can track the prob down. Will report back. Thanks everyone.

Ok. I’ve taken a look at relay R and it looks fine. I’ve gone on to confirm that there is voltage on the switches of the relays L,M,N which connect to relay R and there is.

Then randomly the hundreds scores started working correctly. Hundreds digits work as expected and the relay unlatching properly. Moving the player unit a step on causes the hundreds to correctly register on each of the 4 players. As the hundreds steps through once you go past nine the thousands relay triggers but latches on no score reel doesn’t move as before. As the hundreds ‘fixed itself’ I’m guess I’ve got bad connections or dirty contracts somewhere. I’m guessing in the player unit? The disc on the back is clean and it moves properly but I’ve not taken it off to check the switches on it. Is this the next step?

The only thing is it appear each player and digit is a separate switch and I can’t see a single on affect ALL the tens, thousands etc. The fact the ALL the hundreds were fixed in one go suggests we are looking for something common to all player.

Thoughts?

Thanks.

Ok. Thanks to the help I’ve solved the scoring issue! It was the contacts in the L, M and N relays. I was a bit thrown as I could believe all three weren’t working and that it must be a common connection. But no, all three contacts were dirty. Cleaned and working now - thanks!

NEXT PROBLEM!

I can start a game. And I can add players up to 4 as I should. At game start the player unit resets and displays ‘ball 1’ in play. However, after the ball drains it doesn’t move to the next ball/player. Actually it did a few times intermittently, the stopped again. The player unit is moving freely, it’s just not getting the pulses to move it. The schematic gets pretty involved at this point and I’m not sure I’ve got the correct path in it to fault find. So far I’ve cleaned the contacts on Z1 and Z2 and had a go at cleaning motor switches 1a. Could someone highlight the circuit path I’m looking at that moves the player unit on after the ball drain?

I’ve not yet cleaned the switches he player unit. Do these come into play here?

Thanks. Getting there!

I’ve sorted it! I went through re cleaning replay P and I think U and S and after that all was well!

Everything in terms of players and scorning and ball count seems to work. Or worked!

I’ve been working through now cleaning score reels as most were sticky in some way although all eventually got there. Have complete d player one and two reels and now the 10000 of player 2 doesn’t work when the 1000 goes past 9. I’ve check the 9 switch on the 1000 reel and it works. I think the next port of call is a switch in the player unit. Is that correct. Seems odd that it was working and since doing the reels is not however.

Have I missed something?