| 摘要 |
A CPU 113 executes a control program stored in a memory 116 , whereby a patch image is formed on a photosensitive member of a photosensitive member unit 10 , a light emitter 171 irradiates light upon the patch image, a light receiver 172 receives light from the patch image, whether a received-light signal from the light receiver 172 is within a tolerable range is determined, and an image forming condition is controlled and stored in the memory 116 when the received-light signal is outside the tolerable range. Upon entry of a print instruction signal from an external apparatus via a main controller 100 , a printing operation is executed under the image forming condition stored in the memory 116.
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