Do you mean the lights and values of the pop bumpers aren't changing?

I don't have a Blast Off schematic but there's an Apollo schematic on IPDB.org that might be similar. On Apollo the lights and values of the pop bumpers are determined by the Change relay. When the Change relay is active one set of pop bumpers is lit. When it is idle the other set of pop bumpers is lit.

The Change relay is driven by the Match unit; every other step of the Match unit will activate the Change relay. The Match Unit should advance every time 1 point is scored so every time 1 point is scored the pop bumpers should switch.

Have a look at the Match unit in the back box. It should step every time 1 point is scored. If you manually push in the Match unit solenoid plunger and let it go it should step forward cleanly to the next position.

It's possible that your Match unit is sluggish and not stepping reliably. That would make the Change relay and pop bumpers toggle less often. If that's the case it probably needs to be cleaned.

/Mark

I don't understand. The score reel doesn't really have anything to do with the Match unit or the lights. It's the 1 point relay that advances the Match unit.

Or do you mean that you're manually advancing the Match unit? If that's the case the Change relay should not change unless the Match unit advances. If it does chances are that the wipers on the Match unit aren't making a good connection with the wiper board, probably because they're dirty.