Thank you. I note that "Pinballdaveh" participated in the discussion of Gottlieb's Domino that led me to your organization.
The instruction card for Domino states that hitting a domino spin target when the corresponding domino is lighted on the playfield will score an advance and 500 points. This only works for the left target. The right target scores 100 points (the default score) and bumps the roto unit a step.
There is a parallel wiring, common to both targets, which has the effect of scoring the default - 100 points - when the domino target does not match the domino lighted on the playfield. This default scoring is working fine for both targets.
The schematic indicates that the left roto-target is wired through the roto unit (to determine which target was struck) and then to the domino step-up unit (to determine which domino is currently lighted). I verified the wiring by disassembling the roto unit (it needed cleaning and lubing anyway).
The right roto target is another story. The schematic shows that it's wiring skips the roto unit and proceeds directly to the domino step-up unit. When I followed that wire, it indeed skips the roto unit; however, that wire leads to the "add roto unit solenoid" which bumps the roto unit ahead. The effect is that the right roto target only scores 100 points and advances the roto unit, regardless of whether the target matches the domino lighted on the playfield.
I tried to find a cut wire in the harness, as I suspected that someone has tinkered with the wiring. This was unsuccessful. I also jumped the wire in question to the various leads on the domino advance unit, which had mixed results, none of which corrected the situation (e.g., scoring an advance and 500 points on all hits).
I appreciate any advice you may have.
