Hi folks - request a little advice. I have a 6-18057 6-8-6 S-2 Turbine semi-scale engine on my workbench. It has a LCRU-2 with pulmor motor. Manufacture date approximately late 1998. The smoke resistor was replaced because of infinite resistance and no continuity. Now the smoke fan motor runs continuously. As soon as power is applied to the track, the headlight lights, as it should, the fan motor starts, it should not, and no sounds. Once the engine is called, the sounds come on and the engine performs fine with the exception of the smoke. The smoke fan stays on continuously, but smoke only occurs when depressing the 9 button. As soon as the 9 button is released, smoke stops. Again everything else works fine. When the engine is shut down via the control system, the engine shuts down, but the smoke motor stays on.
1 - factory reset was completed including the AUX1 "4".
2 - 27 ohms across the resistor. All wires are secure. Grounds were all checked. Continuity on all five wires serving the smoke unit (two from smoke board to fan; three from smoke board to power, ground, and serial.)
3 - placed a piece of electric tape between fan motor and shell - there is a very close clearance.
4 - fan turns freely, no obstructions.
5 - no continuity between smoke resistor and reservoir.
I am hoping someone can suggest something short of replacing the LCRU-2 board.
Thank you, Hank