@GGG posted:Stan, It is not 2-3V of DC for motion. The processor won't start up at that level and even if it was running, that is not a high enough voltage to come out of neutral. Joe confirmed how the boards work in DC as I mentioned.
I said the zone of 0 sMPH speed command in DC is 2-3V. This is the voltage range that Joe said is small and finicky. As shown in my simplistic curve above, this 2-3V zone starts at some voltage - I'm guessing around 8-9V DC or whatever is enough to be able to create 5V digital power for the electronics.
So for any track voltage below 8-9V DC, the engine will shutdown. Then for voltages above that there is a 2-3V zone where speed command is 0 sMPH. Then around 10V the engine starts to move.
Again, I believe the voltmeter in the particular engine is faulty. If the OP sends the board to you, then I'll volunteer to power up a PS2 board set and track down the voltmeter circuit. This will involve looking up the locations of the A/D pins on the processor chip and working backwards to find the scale-down circuit that converts the track AC to a DC voltage. Remember I'm not an ASC tech so I don't have a PS2 test fixture which I assume would help with component level diagnosis.
But if the OP doesn't want to send it to you or someone else who will commit to troubleshooting on this thread, then it's moot and chalk it up to an unsolved mystery.
