When these crane/boom units first came out several years ago, a few Forum members had problems like you are describing. One day the units would work fine, and then next time they wouldn't work. I don't think anyone ever really diagnosed and understood what was going on.
I don't have this set, but it did remind me of problems I have seen when an input to a CMOS logic circuit is accidentally left unterminated. The floating input's impedance is so high that the input can switch from high to low level with almost the slightest change - temperature, humidity, dirt, etc. This can drive you crazy until you find the problem because the problem changes from one time to the next!
well dale that is the best explination i have heard. i have tried putting the car in the freezer and i have removed the two chips and cleaned the contacts it still wouldn't work. you are on to something "cmos logic circuit accidentally left unterminated", that may account for the loud pop noise when turning track power on and off.
when i was in canfield the technician replaced the two chips on the board but it still wouldn't work. when he replaced the motherboard it worked, at least till i got home.
