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Check item
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Check method
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Assumed cause
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Transfer failure
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Check the evenness of halftone density. Check whether uneven image or foggy image appears.
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Transfer system failure or transfer roller failure is considered.
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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, grid 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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Side registration
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Check the left margin.
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Floor at the installation site is extremely distorted, or the feed system failure is considered.
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Shock
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Check whether horizontal lines appear on the image.
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Rollers’ feed system failure or laser exposure system failure (drum, Laser Scanner) is considered.
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