Patent ID: 8270861

Claim:
An image forming apparatus comprising: a photosensitive body; a charger configured to charge the photosensitive body; an exposure unit configured to expose the photosensitive body charged by the charger; a developer transport section configured to cause relative movement with respect to the photosensitive body for transporting developer therebetween according to an application of a bias voltage; a processor; a memory having machine readable instructions that, when executed by the processor, cause the image forming apparatus to perform steps including: measuring a current flowing between the photosensitive body and the developer transport section while the application of the bias voltage is disabled; comparing a current with a threshold, the current being measured in the measuring step when the photosensitive body and the developer transport section move relatively to each other and a first area of the photosensitive body that needs to be exposed faces the developer transport section; and determining whether an exposure of the photosensitive body is proper based on the step of comparing.