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Check item
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Check method
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Assumed cause
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Black line
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Check whether black lines appear on the image.
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Laser light path failure, developing system failure, cleaning (drum) failure or transfer roller failure is considered.
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White line
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Check whether white lines appear on the image.
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Developing system failure is considered.
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Uneven pitch
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Check whether lines appear on the image in the horizontal scanning direction.
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Drum failure, developing system failure, laser exposure system failure or drive-related failure is considered.
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Uneven density
(rear/front)
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Check the density difference between the front and rear sides.
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Drum failure or developing system failure is considered.
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