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Horizontal line (TYPE=8/9/10)
Check item
Check method
Assumed cause
Black line
Check whether black lines appear on the image.
Laser light path failure, developing system failure, cleaning (drum) failure or transfer roller failure is considered.
White line
Check whether white lines appear on the image.
Developing system failure is considered.
Uneven pitch
Check whether lines appear on the image in the horizontal scanning direction.
Drum failure, developing system failure, laser exposure system failure or drive-related failure is considered.
Uneven density
(rear/front)
Check the density difference between the front and rear sides.
Drum failure or developing system failure is considered.