SHOVEL OPERATOR SMELLED SMOKE ON THE O&K RH200 HYRAULIC SHOVEL. IT WAS DISCOVERED THAT A CONTROL SWITCH FOR A POWER STEP HYDRAULIC SAFETY ACCESS HAD STUCK, CAUSING THE ELECTRIC DRIVE MOTOR TO FAIL FOR THE POWER STEP. DURING THE SUBSEQUENT NIGHT SHIFT AN ELECTRICIAN & MECHANIC WERE ASSIGNED TO REPAIR THE SYSTEM. UPON ARRIVAL THIS BOOMSTYLE MANLIFT SYSTEM WAS FOUND TO BE IN THE DOWN