The smoke unit is similar to the one in the postwar N&W J. Test for power to the smoke element, and continuity through the element, should have some resistance electrically. If the element has no continuity, it is burnt through someplace, and needs a new resistor, with a wick and some material in the bottom of the smoke unit that will hold fluid, like MTH wick material or Tiki torch material. Also, before taking anything apart, make sure the piston is free and pumps air into the smoke unit. There is no "off" switch, and probably has too much fluid in it. I replaced the element in mine not long ago, so if you need more help LMK.