Mikado 4501 posted:It's supposed to be the set amount of resistance in certain areas so that they receive a safe amount of voltages. If it's not done, certain electronics can receive a too high voltage and get totally fried.
This is at least what a friend of mine told me from looking over one that experienced just that.
I think I understand what you are trying to say but I wouldn't call it an "ohm setting". I think that is a misleading term and just doesn't sound right.
Just this past Sunday I went over a friend's house to show him a MTH PS1 SD40-2 that I upgraded to TMCC about 17 years ago. I used a TAS UCUB board. I had to calculate a resistor for the light circuit. Well, I may have miscalculated because the lights never worked after the upgrade and I never did bother to trouble shoot the problem. Either I put too little a resistor and blew out the bulbs or too much of a resistor and they won't light up. I lent my friend the locomotive for a while and I will look into this when I get it back. Other than the lights all the electronics still worked. Back when I had a 3 rail layout I thought there was something wrong with this locomotive. Sometimes it wouldn't blow the horn or bell. What my friend told me was that the PS1 sound board was thinking it was in reset and he was actually able to consistently put the board in forward or reverse or reset by using the MTH Z-4000. I only had a PW ZW back then. However, unlike the original PS1 electronics the TAS board will move the locomotive forward and backward in any of these modes because it is the TAS board that is controlling the motors not the original PS1 control or motherboard. I was happy to find out that the UCUB actually does work properly with a PS1 sound board! I always thought it worked just not quite that good.
This is probably old news to all you professional repair guys out there but it was very interesting news to me.
