Abstract: An adjustment includes a first current adjustment for adjusting a first current Idrv by supplying a superimposed current of the first current Idrv and a second current Ib to an LD 101a, and a second current adjustment for adjusting the second current Ib by supplying the second current Ib to the LD 101a without supplying the first current Idrv thereto. Upon reception of an image forming instruction, a control unit performs adjustment in order of the second current adjustment for the first time, the first current adjustment for the first time, the second current adjustment for the second time, and the first current adjustment for the second time. An execution period of the second current adjustment for the first time is longer than an execution period of the second current adjustment for the second time.

Abstract: An adjustment includes a first current adjustment for adjusting a first current Idrv by supplying a superimposed current of the first current Idrv and a second current Ib to an LD 101a, and a second current adjustment for adjusting the second current Ib by supplying the second current Ib to the LD 101a without supplying the first current Idrv thereto. Upon reception of an image forming instruction, a control unit performs adjustment in order of the second current adjustment for the first time, the first current adjustment for the first time, the second current adjustment for the second time, and the first current adjustment for the second time. An execution period of the second current adjustment for the first time is longer than an execution period of the second current adjustment for the second time.

Abstract: A printed circuit board of which a part of at least one side of the circuit board is divided by a division process including a first area where a component is placed, and a divided portion where the component is not placed, and which includes the part of the at least one side. Silk is applied to an entire area of the divided portion.

Abstract: A light irradiating device causes a light source to emit light with normal emitted light quantity sufficient for adhering toner on a photosensitive member, on an image portion of the photosensitive member, and causes the light source to emit light with minute emitted light quantity sufficient for preventing toner from being adhered on the photosensitive member, which is smaller than normal emitted light quantity. The light irradiating device includes a determining unit to determine a reference value input to the light irradiating device. Minute emitted light quantity is set based on the reference value input to the light irradiating device. The determining unit determines the reference value to be input to the light irradiating device based on information of relationship between a predetermined reference value and the light quantity in the position of the photosensitive member when causing the light source to emit light, based on the predetermined reference value.

Abstract: A light irradiating device causes a light source to emit light with normal emitted light quantity sufficient for adhering toner on a photosensitive member, on an image portion of the photosensitive member, and causes the light source to emit light with minute emitted light quantity sufficient for preventing toner from being adhered on the photosensitive member, which is smaller than normal emitted light quantity. The light irradiating device includes a determining unit to determine a reference value input to the light irradiating device. Minute emitted light quantity is set based on the reference value input to the light irradiating device. The determining unit determines the reference value to be input to the light irradiating device based on information of relationship between a predetermined reference value and the light quantity in the position of the photosensitive member when causing the light source to emit light, based on the predetermined reference value.