I'm having a scoring issue with my Jet Spin and wanted to see if someone can help me troubleshoot this.

On Jet Spin, the left roto target value corresponds with a playfield standup on the left, the right roto value corresponds with a standup on the right and the center roto corresponds with a kick out hole near the top of the playfield.

All the values work fine except for the 100's (there are three on the roto wheel). When I hit a 100 roto target or its corresponding playfield feature:

1. The score motor spins
2. The left, right or center relay activates
3. the "HIT" light goes on
4. The kickout hole eject activates if it's a center shot

Here's what doesn't happen:

1. The score reels don't move
2. The chime doesn't chime

So far, I've cleaned off the contacts on the roto stepper and bonus stepper and made sure that the contact fingers are sitting right on top of the contacts with each click. I've cleaned the contacts on the 1000-point relay and I've also checked the connections on all these units with a multimeter and everything seems fine. Clearly, contact is being made and the signal is going somewhere - the fact that the problem occurs on the 100-value standups and kickout make me think that the answer lies somewhere other than the roto target.

Let me know if you have questions - Thanks in advance!

All clean (plugs and sockets) but still no 100 scoring.

Thanks, guys - I'm going to buy a wire barrel brush tonight and give the female plugs a better going-over. I do have a schematic, but I've always had trouble reading them - my score motor appears to be reversed from the diagram, so I'm not sure which switch bank is the #1 position.

There's another problem I've encountered that my be related - The top lanes and inlanes are supposed to add bonus as well as scoring. The D relay ("Add Bonus & Spin Roto") fires and points are added, but they the bonus doesn't get added. If I'm reading the schematic right, the 100 roto-target also runs through the D relay, so I'll plan on following that connection tonight.

Wickerman2 - I used a de-greasing cleaner to clean the contacts. Would you recommend steel wool?

BINGO!

Those yellow stickers are well-hidden, but I found #1, unscrewed the lowest stack of relays and found that the outermost leaf was bent out of shape. I plied it back into place, re-installed the stack, fired it up and played my first proper game of Jet Spin! The 100 targets work perfectly now and the bonuses are scoring just as they should!

Maybe I can ask just one more tech question. Occasionally - every few games - the right roto target or corresponding standup gets stuck and won't stop scoring until I drain or advance the bonus. With the glass off, I can pull the target away from the strike plate but it still keeps going. Any ideas where I should start looking?

I figured it out - the right standup target was sticking. I'm in the EM repair zone - just a few more issues to work out and she'll be playing perfectly!