Solid black (TYPE=7)

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Solid black (TYPE=7)

Check item | Check method | Assumed cause
Transfer failure | Check the evenness of halftone density. Check whether uneven image or foggy image appears. | Transfer 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.