An overcurrent protective device has a current detecting section and a control section. In the event the first thread instruction is a set bus trace enable bit instruction, the processor sets a bus trace enable bit corresponding to the thread. The first calibration codes control the conductive states of first transistors that are coupled in parallel between a supply voltage and a first terminal. A user agent loaded when the workstation is accessed with a selected profile executes the user activities in the corresponding context. By this means, a high quality image can be obtained by suppressing color fluctuations with printing efficiency maintained at a high level even if large color fluctuations occur during continuous printing. The replacement portion is adaptively machined based on one or more parameters of the native component portion and based on one or more original design parameters of the component.