According to a method and apparatus for controlling a voltage of an image forming apparatus, a transferring roll resistance, which indicates the resistance between a transferring roller and a photoconductor drum, is detected by applying a first voltage to the transferring roller. The tool lock has a housing in which a lock cylinder assembly and locking balls are disposed. The definition table may be built up using a learning process during use of the application. The method also includes depositing an encapsulant about the power conversion circuitry.