Well, here's the current status - Me: At my wits end
I tried reversing the wires, and still get an error on the wobble head test. Putting things back to originally how it was wired enables the backbox head test to go smooth.
Digging into the switch test, I tested switch 81 which is the backbox head switch and I can block and unblock the sensor fine, with perfect results.
Shifting to the switch 21 on the switch test also seems to work fine. Normally open, and if i block the backbox head switch while on the slam tilt / 21 switch test, it DOES NOT trigger the slam tilt switch.
So, to summarize:
- Anything other than the wire/diode trace as it came triggers backbox head errors
- Reversing the diode direction and / or reversing the wires on the inputs on the backbox head circuit board eliminates the backbox head / slam tilt problem in game, but causes the backbox head not to function in game.
- In switch test mode, there appears to be no behavioral connection between the slam tilt switch and the backbox head switch. The issue ONLY arises in the actual game.
- Unplugging the backbox head, but leaving it enabled in the firmware does NOT cause a slam tilt when normally the backbox head would be enabled in the game (i.e. mini playfield up / multiball situation)
- The common pin between the backbox head switch and the Slam-tilt switch is 208-1
- Unplugging the slam-tilt leaf switch at the front of the game has no effect on the problem.
This is how the board was wired as shipped / is current wired:
JP 208-1 -> Switch on head circuit board -> Diode (unbanded side) ->Diode (Banded side) -> JP 206-9
One final thought... Looking at the manual, it appears the way this SHOULD be wired is:
JP 208-1 -> Diode (unbanded side) ->Diode (Banded side) -> Switch on head circuit board -> JP 206-9
I note that this causes the backbox head error, but not the slam-tilt issue.
As much as I'd really like to get this working (especially since I expect this to be a plug-and play kit) I'm wondering if I should remove the backbox head switch from the circuit and leave everything else enabled, to see if I can get the head to at least move. I'm not certain what function the head switch does - besides let the machine know the position of the head. I assume it will still run, just not recenter?