An image forming apparatus to form an image on a photoconductor by scanning light on the photoconductor includes a printer engine having a polygon motor that can be controlled to revolve at an arbitrary number of revolutions, a deflector driven by the polygon motor to be rotated to deflect the light and a motor controller to control a revolution of the polygon motor. The apparatus further includes a controller to control the apparatus. The apparatus is connected with a host computer, and the polygon motor is controlled to stop revolving when the apparatus is in a waiting status.When the apparatus is set to form the image with a single picture element resolution, the controller outputs to the printer engine a request to revolve the polygon motor immediately after receiving a printing instruction to form the image from the host computer and a printing request to form the image after completing image processing for forming the image.
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