A method of controlling a voltage regulator having a nominal input and a nominal output structured to operate in a forward power mode wherein power flows from the input to the output and a reverse power mode wherein power flows from the output to the input. The process includes the following steps:. A couple mechanism is provided which couples the indexing mechanism to the container to compensate for any variation in pre-actuation positionings of the indexing mechanism and container. This arrangement drives and controls the motor with consideration of the oil temperature of the cooling lubricant oil and thus ensures more adequate actuation of the motor, compared with a conventional drive control without consideration of the oil temperature of the cooling lubricant oil. The second head has an outer surface facing away from the handle. The result is that dark regions of the image become significantly darker, while light regions remain about the same.