At times, changes in the environment or wear on the machine can cause its image output to become unstable. To make sure that its output will remain stable at all
times, the machine uses the following control mechanisms:
The term APVC stands for "auto primary voltage control," and it is a mechanism used to control the primary charging application voltage (DC component) to suit
the film thickness of the machine's photosensitive drum. APVC is performed every 500 sheets while the machine is in operation. It is forcibly performed when the