So out of the blue, my PoTC no longer registers ball trough switch 3.
I did the following:
1. On the mpu, verified that I can trigger the switch 3 pin (which is the white-orange wire) with the green-red wire, switch registers fine in test mode.
2. On the trough, I used my dvm on the switch and it works just like the others.
3. At the connector from the switch to the wiring harness, I verified continuity from the white orange at the switch to the white-orange on both sides of the connector.
4. There is *no* continuity from the connector side of the white-orange to the backbox white-orange at the connector. I verified that ball trough 4 wire (white-red) *does* have continuity from the connector to the mpu connector (and works fine obviously). I looked under the playfield and it appears that all the ball trough wires make a direct run from the connector at the ball trough right to the connector at the mpu.
I don't see any obvious pinching or breaks of the white-orange. All the other ball trough switches and optos work fine
From the above, I am deducing that:
1. MPU switch matrix is fine.
2. Physical switch is fine
3. the wiring switch to connector at harness, and harness to male-to-male to other harness is fine.
4. Orange-white wire must be broken somewhere, right? I did try testing the wire itself by displacing insulation short of the actual idc connectors and there is no continuity.
Is my only option to run a new wire?
thanks