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17 gradations (TYPE=2/3)
Check item
Check method
Assumed cause
Gradation
Check whether gradation in density is made appropriately.
Drum failure, laser exposure system failure or developing system failure is considered.
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.