On other games the leaf switch closed by the rotating weight (or spinning target) advances the mini stepper (AS relay) each time the leaf switch closes. In your game it sounds like the Spin Pulse relay could be another candidate. Either way you should be able to manually spin the weight slowly and see something else activate each time the leaf switch closes. If the leaf switch does drive the mini stepper it could be that the mini stepper (AS relay) is a little sluggish and not able to respond to the relatively quick pulses of the rotating weight.

On other games the delay relay allows the rotating weight to stop spinning before awarding whatever points or target the mini stepper advanced to so it might not be involved.

For anyone who can't visualize how the Spin Unit works there's more info and video here: www.funwithpinball.com/small-boards#SpinUnit

/Mark

That doesn't sound right. It's possible that the spinning weight leaf switch requires another switch to close to do something but it seems unnecessary. Have you verified that the spinning weight leaf switch closes and makes good electrical contact?

Do you have a schematic for this game? Can you post a section with the spinning weight leaf switch?

Or, can you trace the wires from the spinning weight leaf switch to see where they go? I'd start looking for them on the solder lugs of the mini stepper relay and the Spin Pulse relay.

Ok, that's interesting. That implies that they need to be adjusted so that they're both closed briefly as one opens and the other closes. I found a schematic for Flip A Card which has the same Spin Unit:
Flip A Card Spin Pulse relay (resized).jpg
This shows the Normally Open and Normally Closed Spin Unit switches in series. It also shows that the Normally Open switch on the A/Spin Score Delay relay must be closed too before the X/Spin Pulse relay fires.

If you manually activate the X/Spin Pulse relay do your lights advance as you expect? If so, it seems that either:
- the A/Spin Pulse relay isn't firing or
- the Normally Open switch on the A/Spin pulse relay isn't closing or
- the series switches on the Spin Unit are never both closed

Can you verify that the two spinner switches are ever closed at the same time? You should be able to put a multimeter on the two colored wires on the two leaf switch solder tabs and measure the resistance. Then slowly rotate the spinning target. Most of the time you'll see a very high resistance but at some point in the target's rotation you should see nearly zero resistance across the two switches.

You could also try putting a jumper cross one of the two switches and see if things work any better with just one switch opening and closing. Try it with each of the switches individually.

I would carefully adjust the short blade of the upper, Normally Closed switch.
Spin Unit serial switches (resized).jpg
As the bottom switch closes, it starts to open the upper switch via the white spacer. The short leaf of the upper switch needs to follow the long leaf for a bit so that both switches are briefly closed at the same time. That upper switch only needs to open at the very top of the motion of the spinning target so I think you may just need to bend that short leaf up a scoche.